Revalidation and Description of Aed Es (Finlaya) ?Alliro.'Tris from Northeastern India (Diptera: Culicidae)

Joumal of the American Mosquito Control Association, 12(4):713-72O, 1996 Copyright O 1996 by the American Mosquito Control Association, Inc. REVALIDATION AND DESCRIPTION OF AED ES (FINLAYA) ?ALLIRO.'TRIS FROM NORTHEASTERN INDIA (DIPTERA: CULICIDAE) S. C. TEWARI aNo J. HIRIYAN Centre for Research in Medical Entornology, Post Box No. 1i,,4, Sarojini Street, Chinna Chokkikulam, Madurai 625 O02, Tamil Nadu, India ABSTRACT, Aedes (Finlaya) pallirostris Edwards is resurrected from synonymy with Aedes (Fin.) formosensls Yamada and the female, male, pupa, and 4th-instar larva are described and compared with closely related species. The synonymy of Finlaya khasiana Barraud is transferred from Ae. formosensis to Ae. pallirostris. INTRODUCTION Female. Head: Antenna dark brown. about 0.75 (0.70-0.90) proboscis; Based on only adult specimens, Aedes (Finlaya) length of flagellomere I patch pallirostris Edwards and Finlaya khasiana Barraud with of broad dark brown scales, pedicel light brown with patch were described from Assam, India, in 1922 and mesal of brown scales; clypeus 1923, rcspectively. The latter was synonymized dark brown, bare; maxillary palpus dark scaled with pale scales at apex of palpomeres 3, 4 (some- with Aedes formosensis Yamada by Barraud (1934), whereas the former was synonymized with this spe- times absent on 3), about 0.20 (0.19-0.23) length of proboscis; proboscis dark-scaled, about 1.1 cies by Knight (1968). Aedesformosensis was orig- inally described from Taiwan (Yamada l92l). In length of forefemu! dorsally pale scales visible lat- 1991, during our mosquito faunal surveys in Assam erally on middle, pale stripe ventrally from basal (Northeastern Region, India), no specimens of Ae. O.l5 to O.8O; vertex with submedian patch of broad, decumbent, dark scales with broad pale scales formosensis were encountered. Instead, we found a from lateral to dorsal dark submedian area, ocular mosquito very similar to Ae. formosensls, but with scales male genitalia and other adult characters agreeing pale, narrow, lateral dark patches of broad scales with the type specimens of Ae. pallirostris housed near ocular line, postgena with pale-scaled patches, in The Natural History Museum, London (R. E. pale scales, and pair of long pale setae, 4-6 dark Harbach, personal communication). The larva of brown ocular setae on each side; occiput with nar- this species proved to be distinctly different from row decumbent pale scales and numerous dark (some that of Ae. formosensrs and a closely related spe- erect forked scales specimens also with pale cies, Aedes reinerti Raftanarithikul and Harrison, scales) extending forward to vertex except on dor- described from Thailand. We consider this species somedian pale line. Thorax: Scutal integument red- to be Ae. (Fin.) pallirostrls and hereby restore it to dish brown, scutum covered with narrow scales ex- full species status. Its female, male, pupa, and 4th- cept on prescutellar area, pattern of pale-scaled instar larva are described and illustrated and com- lines on dark background as follows: acrostichal pared with Ae. formosensis and Ae. reinerti. line extending posteriorly and forked to enclose The terminology used follows Harbach and prescutellar area, anterior dorsocentral line at level Knight (1980, 1982). In the immature descriptions of scutal angle, posterior dorsocentral line curved the range of setal branching is followed by the outward and reaching scutal angle, distorted line mode in parentheses. from near scutal angle to parascutellum, supraalar pale scales sparse, anterior ones long, linear, thick patch posteriorly over wing root; acrostichal setae TAXONOMIC TREATMENT present, dark brown, sometimes anterior setae pale, Aedes (Finlaya) pallirostris Edwards several well-developed dark brown setae on anterior promontory, lateral and posterior scutal fossal, Aedes (Finlaya) pallirostris Edwards, 1992:270 antealar, supraalar (with few pale ones), dorsocen- (9); Barraud 1934:l9O (Q); ftuight 1948:64O (?). tral, and parascutellum; scutellum with patch of broad and narrow white scales separating lateral Finlaya khasiana Barraud, 1923:4Oi (d, 9); Ed- broad dark-scaled areas on median lobe. lateral lobe wards 1932:151. TRANSFERRED SYNONY- with broad dark scales and few narrow white scales. MY. 4, 5 long and 2-4 short pale and dark brown setae Aedes from Assam, India, of Barraud, formosensis on median lobe and 5-7 long and l-3 short pale 1934:189. and dark brown setae on lateral lobes; pleural in- Diagnosis. In the larva, comb scales with 2-5 tegument dark brown, antepronotum largely cov- large, conspicuous apical spines easily distinguish ered with broad white scales and with few nalrow Aedes pallirostrls from related species. Other dif- white scales anteriorly, 8-16 pale and dark brown ferential characters shown in Table 2. setae; postpronotum mainly covered with narrow 713 714 JouRNAL oF THE AMERrcel Mosqurro CoNrnol AssoclATIoN Vor. 12.No.4 IX-Te ffi f/ SCo ffiwH'lmnr-{ Vlll -Te : = Fig. 1. Aedes (Finlaya) pallirostris, female genitalia. AGDB : accessory gland duct base, Ce cercus, I insula, : : LVL : lower vaginal lip, PGL : postgenital lobe, SCa : spermathecal capsule, UVL upper vaginal lip, 1-S seta : l-S, 2-S : seta 2-S, 3-S : seta 3-S, VIII-S : sternum VIII, VII-Te : tergum Vm' IX-Te tergum IX' scales, intermixed with few moderately broad white patches on lower prealar knob and upper mesokat- scales posteriorly,3,4 pale setae (occasionally l,2 episternum more or less contiguous); pleural setae dark setae); paratergite with intermixed broad and pale, 6-8 on proepisternum, 3-5 on postspiracular nzurow white scales; pleura with patches of broad area, lO-14 on prealar area,8-72 on mesepimeron, white scales on proepisternum, postspiracular area, 5-7 on upper and 5-8 on lower mesokatepisternum. subspiracular area, lower prealar knob, mesepime- Izgs: All coxae with broad scales and well-devel- ron, lower and upper mesokatepisternum (scale- oped pale brown setae, fore- and midcoxae with 2 DECEMBER1996 Drscntp,noN oF AEDE| (FrNtAyAl pAtLrRosrRIS lmmT I- @ Gs ffim IX -Te Fig. 2. t-h Aedes (Finlaya) pallirostis. a-f. Fourth-instar larva. g, h. Male genitalia. i, j. Aedes (Fintaya) forrno- sensis.A:antenna;C:cranium;CS:combscale;Dm:dorsomentum;PS=pectenspine;S=siphon;VIII,X : abdominal segments VIII, X; 6-Mx : seta 6 of maxilla; Cl : claspette; GC : gonostylar claw; Gc : gonocoxite; Gs : gonostylus; Pp1 : paraproct; PH : phallosome; IX-Te : tergum IX. small patches of white scales with median dark- pale area (from base to middle) broad and then nar- scaled patch, hindcoxa with large patch of pale rowed to apex; hindfemur anteriorly with subme- scales; trochanters pale-scaled; forefemur dark dian pale area and apicoventral pale patch, poste- scaled with narrow longitudinal line of pale scales riorly pale to basal half and remainder dark-scaled; from base to apex on anteroventral and broader line tibiae dark, each with basal white ring and short on posterior surfaces; midfemur with narrow pale stripe of white scales anteriorly (longer on hindtib- line anteriorly on about basal 0.5 length, posterior ia), line of pale scales on foretibia (entire length) 716 JounNer or tHr AlarntcAN MosQUITo CoNTRoL AssoclATIoN Vol. 12,No.4 'i i f fri'i ,dr I8\ lOmm1 I F I rr"rotls /" l -0.5mm T I s. I 0'5mm { \ : = Fig. 3. Aedes (Finlaya) pallirostris, pupa. CT : cephalothorax, GL = genital lobe, Mr midrib, Mtn metanotum' MtW = metathoracic wing, Pa = paddle, T = trumpet, I-IX = abdominal segments I-IX. and midtibia (about 0.5 length) on posterior sur- tooth, hindungues simple. Wing: Dark-scaled, costa faces; fore- and midtarsomeres I, II with distinct with pale line basally reaching to or crossing be- basal white bands. narrow band on midtarsus III; yond humeral crossvein. Halter: Pedicel with dark hindtarsus with a distinct white band on tarsomeres scales anteriorly, capitellum pale scaled with small I-III; ungues equal, fore- and midungues each with patch of dark scales apically. Abdomen: Terga dark DECEMBER1996 DEscRIprIoN or Aeozs (FrNtAyA) pALLrRosrRrs 717 Table 1. Chaetotaxy of the pupa of Aedes (Finlaya) pallirostris.l Cephalo- thorax Abdomen Seta no. II ru IV VI VII VIII 0- 1 r,2(1) ll lll ll 8-14(8F 2-6(3) t-s (2) 2-:7(2) r-3 (2) r-3(r) l-3(r) 2 r-s (2) rllllr.2(l) | - 3 1-3(1) 1,2 (1) I l 3-7(4) 2-4(3) l-3(2) t.2(t) 4 2-6(s) 3-6 (4) 3-6 (4) 4-6 (s) 3-s (4) 3-6 (4) 3-5 (4) 2-4 (2) 2,3 (2) 5 2-4 (2) 2-4 (3) 1,2(r) r,2(2) I r,2(r) l. 2 (l) l. 2 (l) 6lr,2 (r) | 2,3 (2) 2-4 (2) t-3 (2) t,z(t) 2 - 7 2-4 (2) 2,3 (2) 2-4(2) 4-6 (5) 3-s (4) 4, 5 (5) r-3(2) l - 8 2-6(4) r-3 (1) 3-5(s) 3-s (4) 3-s (5) 3-6 (4) t-4 (2) 9 r-3 (2) r,2 (r) I l ll| 2-4 (3) 5-lo (6) r0 l-3 (3) 1-3(1) 2-s (4) 3-6 (4) l r,2 (r) r,2 (r) n 1,2(r) llll t2 l-3 (3) 111 I4 I tl111 'Paddle: l-R 1. 'Eight main branches. scaled, pale setae on apical and lateral margins of lobed, each lobe moderately pigmented with 7-12 segments, setae abundant on tergum I, tergum I setae, sternum IX with 5-7 setae (usually 2 strong, with laterotergite largely covered with snowy white long setae) alranged in irregular row, one specimen scales, terga II-VII each with patch of snowy white with one broad scale attached medially; gonocoxite scales basolaterally and a white scale-patch on ba- long, slightly broader basally, densely spiculate and somedian areas; sterna dark brown with basal white scaled, dorsal surface with row of short, flne setae bands on III, ry.

Load more