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Thrhi: NI'w SYMI'atkk PLEOCOMA from Mil. S< >1

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Thrhi: NI'w SYMI'atkk PLEOCOMA from Mil. S< >1 THRHi: NI'W SYMI'ATKK PLEOCOMA FROM Mil. s< >1 Mil R1 .1! RR I I NEVADA MOUNTAINS OF CALIFORNIA KOI OF] RA: S( ARABA1 ID i Frank I. H0VORE 1 Abstract: Two new species and one new subspecies iii Pleocoma an d< cribctl from sympatric populations in the Greenhorn Mountains of the southern Siena Nevada range, [ntraspecific character variation, comparison to closely related forms and biology arc di following each description, An ecological description of the lype locality is also presented. Beetles of the genus Pleocoma have long been golden hairs; dorsal surface closely, irregularly prized and much sought alter by Pacific coast punctate, with broad smooth area extending from base coleopterists, yet our knowledge of the habits and lateral of vertical horn anteriorly to base of ocular canthus; clypeal process small, constricted at distribution of the genus is still rather fragmentary. base, only moderately rcflcxcd. anterior face slightly The three new forms described herein help I ill a concave medially, apex with moderately deep, obtuse large distributional gap between the central Sierra notch, apical angles of notch acute, rounded; vertical Nevada and Tehachapi Mountains. They also horn elongate, sides subparallel, apex with shallow, present the first recorded instance of three obtuse notch, apical angles of notch rounded, anterior Pleocoma species occurring sympatrically. Refine- face of horn evenly convex, surface coarsely punctate, ments in collecting apparatus, easier access to re- punctures elongate, sparsely clothed with long reddish- mote areas, and increased knowledge of male golden hairs; ocular canthi projecting forward from a Pleocoma flight habits will undoubtedly lead to right angle, anterior edge sinuate, apex acutely rounded, dorsal concave, the discovery of more such areas of species surface smooth except for few elongate punctures apically: palpi and antennae sympatry. dark reddish-brown, scape and lamellae darker, scape As in most populations of Pleocoma where stout, subcorneal. second segment moniliform. series have been available for study, the three strongly flattened, third segment elongate, much new taxa presented exhibit considerable minor shorter than scape, slightly reflexed. fourth segment morphological character variation. 1 have there- cylindrical, slightly more than one-half as long as fore selected as diagnostic characters those which third segment, fifth segment strongly transverse with appear most constant, both quantitatively and acute process, segments six to eleven distinctly lamel- qualitatively. late, sixth segment with lamella about two-thirds as Holotypes of new taxa described herein are on long as that of seventh segment, lamella of seventh segment slightly shorter than that of eighth segment, deposit in the Natural History Museum of Los that of eighth distinctly shorter than that of ninth. Angeles County collection (LACM). Other in- lamellae of ninth and tenth segments subequal in stitutions or persons receiving paratypes will be length, that of eleventh only slightly shorter, ratios of abbreviated in the text as follows: California segments six to eleven in holotype 20:30:32:36:36:35. Academy of Sciences, CAS; California Insect Sur- Pronotum piceous, less than twice as wide as long vey, Berkeley, CIS: U. S. National Museum, (length-to-width ratio in holotype 5.85:10.8). widest USNM: F. T. Hovore, FTH: D. G. Marqua, at posterior angles, posterior angles broadly rounded, DGM; C. E. Langston, CEL: T. W. Taylor, TWT: lateral discal impressions feeble, with indistinct H. F. Howden, HFH; B. D. Streit, BDS: G. C. reddish macula; disc evenly convex, anterior median Walters, GCW; M. T. Gannon. MTG: R. L. impression lacking, pubescence entirely absent, surface punc- Westcott, RLW. shining, finely, moderately densely punctate, tures denser anteriorly, less distinct and more widely spaced laterally. Legs dark reddish-brown to piceous. Pleocoma marquai, new species clothed with long reddish-golden hairs. Scutellum Figure 1 finely, sparsely punctate centrally, nearly glabrous. Description: Male. Form robust, oblong-oval, Elytra black, shining, finely, shallowly, irregulari moderately convex, dorsum slightly flattened; in- punctate, sutural striae moderately impressed, coarsely. tegument mostly dark brown to piceous; pubescence reddish-golden. Head black, vertical and an- 1 horn Placerita Canyon Nature Study Center. 1 terior process of clypeus thinly clothed with reddish- Placerita Canvon Road. Newhall, Ca 69 70 in III ll\ sol mi i<\ < ILIFORNIA ACADEMY OF SCIENCES VOLUME 71 Figure I. Pleocoma marquai, new species, left lateral view of head and pronotum, holotype (male). Scale equals 2 mm. irregularly punctate, geminate striae at margins of longer than second segment, fourth segment slightly costae feeble, indicated only by single row of fine, transverse, fifth segment with acute process, segments shallow punctures, costae with few minute punctures, six to eleven distinctly lamellate, forming club, sixth not elevated. Abdomen dark reddish-brown, sternites segment with short lamella, lamellae of segments moderately densely, irregularly punctate, punctures seven and eight subequal, only about three-fourths moderate in size, thinly clothed with reddish-golden as long as that of segment nine, lamella of segment pubescence. Length 22-28 mm. nine longest, those of segments ten and eleven slightly Female. Form ovate, robust; color reddish-brown; shorter than nine and of decreasing length. Pronotum pubescence pale reddish. Head with clypeus coarsely, convex, shining, dark reddish-brown, lighter laterally, densely punctate, expanded apically, apical angles less than twice as wide as long (length-to-width ratio acute, rounded, anterior margin feebly sinuate near in allotype 9:16.8), widest at posterior angles, pos- median notch, median notch small, shallow, narrowly- terior angles obtusely rounded, disc moderately, ir- rounded; vertical horn very short, stout, apical notch regularly punctate, punctures larger and denser broadly obtuse, rounded, apices rounded; antennae laterally and anteriorly, interrupted medially by vague castaneous. lamellae slightly darker, third segment longitudinal impunctate line. Sculellum finely, sparsely short, subcylindrical, about one and one-half times punctate anteriorly, few punctures with short re- ' I'}/ THREE NEW SYMPATR1C ( PLEOCOMA FROM \LIFOR I Figure 2. Pleocoma fimbriata Lee, left lateral view of head and pronohim. male. Scale equals 2 mm. cumbent hairs. Elytra widest behind middle, trans- 7, GCW 21, LACM 4. USNM 3. HFH 4. RLW 4, parent, surface shining, finely, irregularly punctate, CIS 5, CAS 4, MTG 5: 14 a 5 9. .6 mi E Posey. 15 costae elevated, nearly attaining elytral apices, sutural October 1971 to 25 October 1971 (F. T. Hovore) striae distinct, impressed, coarsely punctate, geminate FTH: 23 i 7 9 . 1 mi N and 2 mi N Posey. 16 October striae at costae, feebly impressed, finely, irregularly 1971 to 1 December 1971 (C. E. Langston l CEL: • punctate. Length 31-40 mm. 24 . Balance Rock Resort, 16 October 1971 to 12 Holotype: Male, California, Tulare Co., Posey, 16 November 1971 (F. T. Hovore. B. D. Streit) FTH 4. October 1971 (B. D. Streit) LACM. Allotype: Fe- BDS 20. Kern Co.. 9 ; . Glennville. 14 November male, California. Tulare Co.. Posev. 12 November 1968, 15 November 1969. 26 November 1970. 11. 12 1971 (T. W. Taylor) LACM. November 1971 (D. G. Marqua. C. E. Langston. Paratopes (241): CALIFORNIA. Tulare Co., 144 $ B. D. Streit) DGM 3. BDS 2. CEL 4. 15 9, Posey, 8 November 1969 to 20 December 1969, Other specimens examined: CALIFORNIA. Tidarc 23 October 1970 to 26 October 1970, 15 October Co., 17$, California Hot Springs. 13 October 196S. 1971 to 29 November 1971 (D. G. Marqua. T. W. 6 November 1966 (David Fields. 4 with no collector Taylor, B. D. Streit. G. C. Walters. F. T. Hovore, listed). C. E. Langston, Dawn, Rod, and Blaine Bryan. M. T. Discussion and diagnosis: Both sexes Gannon) DGM 17, TWT 31, BDS 42. FTH 12, CEL marquai can be immediately distinguished from 72 Hi III n\ sol THERh ( IL1F0RN1 I i< ADEMY OF SCIENCES VOLUME 71 Figure 3. Pleocoma tularensis Leach, left lateral view of head and pronotum, paratype (male). Scale equals 2 mm. their closest congeners, P. fimbriata Leconte and as long, while in the 59 males of tularensis ex- P. tularensis Leach, by the presence of distinct amined, the pronotum is at least twice as wide as lamellae on antennal segments six and seven, with long in all but two specimens, or about 3 percent. that of segment six two-thirds or more as long Pleocoma marquai represents the southernmost as that of segment seven. In both tularensis and form of the fimbriata—tularensis species group. fimbriata, segment six is at most angulate, seg- Thus far, the northernmost known locality for ment seven sometimes with a short projection. marquai is about 30 miles south of the southern- Males of P. marquai may be further differentiated most recorded point of collection of tularensis, from fimbriata and tularensis by the fifth antennal and it is highly probable that somewhere in the segment which is strongly transverse with at least intervening area the two populations overlap. a short projection (at most slightly transverse in Biology: Adults of both sexes and larvae of P. typical fimbriata and tularensis) , and by the marquai have been collected from burrows shorter, less strongly reflexed clypeal process beneath Ceanothus cuneatus Nutt., and it is prob- (Figs. 1-3). In all specimens examined of able that this plant serves as the primary larval marquai the pronotum is less than twice as wide host. Pleocoma tularensis males and females have 1972 THREE NEW SYMPATRH PLEOCOMA FROM CAL1FOR IA Figure 4. PIcocoma rubiginosa, new species, left lateral view of head and pronotum. holotxpe (male). Scale equals 2 mm. been collected from pupal cells beneath Ceanothus first precipitation of the fall season, usually in cuneatus in Fresno County, and I have also col- early October, and may continue until early De- lected female P. fimbriate! beneath Ceanothus sp. cember in years of relatively low rainfall. Males (prob. integerrimus H. and A.) in El Dorado will fly throughout the night while it is raining County.
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