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Conservation Status and Research on the Fabulous Green Sphinx Of Pacific Science (2000), vol. 54, no. 1: 1-9 © 2000 by University of Hawai'i Press. All rights reserved Conservation Status and Research on the Fabulous Green Sphinx of Kaua'i, Tinostoma smaragditis (Lepidoptera: Sphingidae), Including Checklists of the Vascular Plants of the Diverse Mesic Forests of Kaua'i, Hawai'i1 M. L. HEDDLE,z K. R. WOOD,3 A. ASQUITH,4 AND R. G. GILLESPIE 2 ABSTRACT: In 1895, a moth was captured in a mountain home in Makaweli, Kaua'i, that would captivate and elude entomologists for the next century. Ti­ nostoma smaragditis (Meyrick), aptly nicknamed the "Fabulous Green Sphinx of Kaua'i" is a stunningly beautiful moth with green wings and thorax, pale brown hind wings, and orange antennae. Eighteen individuals are known to have been collected on Kaua'i. However, despite extensive searches in areas around Koke'e, all the specimens discovered until the 1990s were incidental catches, and the natural habitat and host plant ofthe moth remained unknown. This study describes the results of extensive searches of the diverse mesic forests with the aim of establishing range, habitat, and host-plant associations of the Fabulous Green Sphinx. In February 1998 a male T smaragditis was attracted to a mercury vapor light set up in the diverse mesic forest. Subsequently, one other specimen was collected in a similar habitat type on another part of the island. However, the host plant of the moth remains unknown. In this paper we provide a history of collections, a summary of known biology, and a guide to potential host plants, including checklists of vascular plants found in the di­ verse mesic forests of two locations where T smaragditis was found, Kalalau and Mahanaloa Valleys on Kaua'i. THE "FABULOUS GREEN SPffiNX of Kaua'i," are bipectinate; those of the female are fili­ Tinostoma smaragditis (Meyrick), is an ex­ form. quisite moth with brightly colored green The first specimen of T smaragditis col­ wings and thorax, pale brown hind wings, lected was an adult male from Makaweli, and orange antennae. There are several dis­ Kaua'i, at 610 m and was given to R. C. L. tinct differences in morphology between the Perkins for identification in 1895 (Meyrick sexes: The male has a black spot on the 1899) (Figure 1). Despite searches for the forewing behind the second median line and moth and its larva (Zimmerman 1958), it was a black band on the thorax behind the head. not until 1961 that a second adult specimen Both these markings are absent in the female. was discovered "resting on the lid of a gar­ The underside of the female's fore and hind bage can" (Bryan 1962) on Koke'e Road, wings are a pale green, whereas those of the Kaua'i. The third specimen, discovered at male are pinkish brown. The male antennae nearby Kalalau Lookout in 1969, marked the beginning of a series of collections as moths were drawn from the surrounding forest, at­ 1 This work was funded by a contract to the University tracted to the bright lights of the Air Force of Hawai'i by the U.S. Fish and Wildlife Service. Manuscript accepted 3 May 1999. Tracking Station (1200 m) situated above the 2 Center for Conservation Research and Training, and mesic forests of the Koke'e region. The Department of Zoology, University of Hawai'i, Hono­ Bishop Museum now has six specimens lulu, Hawai'i 96822. from the area: Kalalau Lookout (1972), 3 National Tropical Botanical Garden, P.O. Box 340, Lawa'i, Kaua'i, Hawai'i 96765. Koke'e Air National Guard Station (1974, 4 Kaua'i National Wildlife Refuge Complex, P.O. Box 1983 [2], and 1984), and Mahanaloa Valley 87, Knauea, Kaua'i, Hawai'i 96754. (1998). 1 2 PACIFIC SCIENCE, Volume 54, January 2000 plant associations of the Fabulous Green Sphinx, focusing on the diverse mesic forests to the west of Koke'e State Park. In our cur­ rent survey we have investigated three re­ gions of Kaua'i: Mahanaloa, Kalalau, and Waimea. MATERlALS AND METHODS A mercury vapor light powered by a gen­ erator (Honda EX350) was used to attract any moths present in the mesic forest. This light was run from dusk until around 2200 hours. Plants were searched for larvae by shaking vegetation onto a white sheet. In addition, the canopy was searched visually using binoculars. FIGURE 1. Main map: Island of Kaua'i showing dis­ tribution for collections of Tinostoma smaragditis. 1, Ho'olulu Valley, 1992; 2, Kalalau Valley, 1998; 3, Kala­ lau Lookout (tracking station), 1969 to present (10 speci­ RESULTS AND DISCUSSION mens); 4, Mahanaloa Valley, 1998; 5, Halemanu, 1961; 6, Makaweli, 1895. Inset: Main chain of Hawaiian Is­ The first specimen captured in our study lands. Star indicates island of Kaua'i. was deposited at Bernice P. Bishop Museum. The second specimen was photographed, and its proboscis was unrolled and measured. It Information on the larva of T smaragditis was then released after being marked on its comes largely from an adult female captured thorax with a yellow dye. in 1992 in Ho'olulu Valley at 122 m eleva­ tion, which laid eggs in the container in Distribution which it was held. The larva, which averages 3.9 mm in length, has a reddish caudal hom Moths were captured in the Mahanaloa about 2 mm long (Cambell and Ishii 1993). and Kalalau areas only (Figure 1). In Febru­ Larvae were also collected before the Cam­ ary 1998 one of us (A.A.) was successful in bell and Ishii (1993) study, although the ob­ attracting a male specimen to a mercury servations were not published. The first in­ vapor light while collecting in Mahanaloa stars and infertile eggs from this earlier Valley (670 m). In October 1998 two of us collection were deposited at the Bishop Mu­ (M.L.H. and K.R.W.) observed another seum; the notes attached to the vial of larvae male specimen that was attracted to light at indicate that only 15 eggs were laid, and of an elevation of 640 m in the diverse mesic these, only 5 were fertile. The eggs took 9 forest of Kalalau Valley. No larvae were ob­ days to hatch, which concurs with the find­ served. ings of Cambell and Ishii (1993). The host plant of T smaragditis remains Response to Light unknown. Cambell and Ishii (1993) con­ ducted extensive host-plant testing, but could On both occasions that T smaragditis was not induce the first instars to feed on any of caught at light in the current study, it was the native plants offered, nor on an artificial observed to fly directly toward the light. Al­ diet (Cambell and Ishii 1993). though some Lepidoptera have been per­ Our study was initiated in November 1997 ceived as rare because they do not respond to to determine the range, habitat, and host- lights, both male and female T smaragditis The Fabulous Green Sphinx of Kaua'i-HEDDLE ET AL. 3 have been collected at lights on several occa­ native Hawaiian vascular plant endemics sions. If its native habitat is the low, diverse that both sites have in common (Appendix mesic forests, as we hypothesize, it is likely 1). that a strong response to light takes it far up At the time of writing of this paper, the to the tracking station near Kalalau Lookout host plant of T smaragditis is still unknown. at Koke'e State Park. However, various entomologists have made several suggestions and observations with re­ Host Plants gard to possible hosts. The most extensive effort to establish the host plant was made by Both locations at which T smaragditis Cambell and Ishii (1993). The female moth was found, Mahanaloa and Kalalau, repre­ discovered in 1992 was found on the endemic sent a globally imperiled plant community tree Charpentiera densiflora. At the time of known as Diverse Mesic Forest (Wagner et collection, the tree was not searched for lar­ al. 1990). This natural community is endemic vae or eggs (Gaden Kamakaui, pers. comm.). to Kaua'i and is characterized by its rich di­ The resultant larvae were not observed to versity of native tree species along with the feed on any of the 130 native plants offered absence of a consistent set of dominant spe­ to them, and Cambell and Ishii concluded cies. Common tree genera in both these re­ that plant species used in their study are im­ gions include Acacia, Alphitonia, Antidesma, probable candidates as host plants for T Bobea, Charpentiera, Cheirodendron, Cop­ smaragditis. However, several plants were rosma, Diospyros, Elaeocarpus, Hedyotis, offered to the larvae for 5 min only, including Melicope, Metrosideros, Myrsine, Nestegis, Charpentiera densiflora, the plant on which Pipturus, Pisonia, Pleomele, Pouteria, Psy­ the female was resting. Because many species chotria, Santalum, Syzygium, and Xylosma. of Lepidoptera can take several hours to ini­ Other occasional components shared be­ tiate feeding in captivity (M.L.H., pers. obs.), tween these two Kaua'i Diverse Mesic Forest the plants listed in the Cambell and Ishii communities include Claoxylon, Crypto­ (1993) publication should not be excluded carya, Flueggea, Hibiscus, Morinda, Ner­ given the data available. audia. Perrottetia, Pittosporum, Pteralyxia, Claoxylon sandwicense was suggested as a Rauvoljia, Tetraplasandra, Wikstroemia, and host plant for T smaragditis by Bianchi Zanthoxylum. (1986) after he observed substantial herbi­ Regional checklists of vascular plants ob­ vory on the plant in the vicinity of the track­ served within T smaragditis habitat for both ing station where the moth had been col­ Mahanaloa and Kalalau Valleys are pro­ lected. However, he searched the plants in vided in Appendix 2 and Appendix 3 of this the surrounding area and found no larvae.
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