PROC. ENTOMOL. SOC. WASH. 87(4). 1985, pp. 821-825 AMBLYOMMA A NTILLORUM KOHLS, 1969 (ACARI: IXODIDAE): DESCRIPTION OF THE IMMATURE STAGES FROM THE ROCK IGUANA, IGUANA PINGUIS (SAURIA: IGUANIDAE) IN THE BRITISH VIRGIN ISLANDS James E. Keirans Department of Health and Human Services, Public Health Service, National Institutes of Health, National Institute of Allergy and Infectious Diseases, De-partment of Entomology, Museum Support Center, Smithsonian Institution, Washington, D.C. 20560. Abstract . —The nymph and larva oi Amblyomma antillorum are described and illustrated for the first time from specimens collected on the endangered rock-or Anegada iguana. Iguana pinguis on Anegada Island, British Virgin Islands. On Caribbean islands, iguana-feeding ticks of the genus Amblyomma comprise a small, relatively compact group of four species: Amblyomma albopictum Neu-mann, A. antillorum Kohls, A. cruciferum Neumann, and A. torrei Vigeuras. Amblyomma dissimile Koch is only found occasionally on iguanas. It is primarily a parasite of snakes and also parasitizes Amphibia. Herein are described the immature stages oi Amblyomma antillorum Kohls, a parasite of the rock iguana. Iguana pinguis (Barbour). The descriptions are based on 2 nymphs and 3 larvae, the only specimens available. Measurements (mm) are given for all specimens. Preparation of immature stages for scanning electron microscopy follows the method of Corwin et al. (1979). Amblyomma antillorum Kohls Nymph (Figs. 1-8).— 5o^.v (Figs. 1, 2). Length from scapular apices to posterior body margin 1.13, 1.64; width 0.86, 1.12, widest at level of spiracular plates. Capitulum (Figs. 3, 4). Length from posterior margin of cheliceral sheaths to posterior capitular margin 0.12, 0. 11; width at level of scapulae 0.21, 0.20. Basis capituli dorsally (Fig. 3) ca. 2 x as wide as long, triangular, comua absent. [The specimen illustrated in Fig. 3 shows the basis capituli with two surface indentations centrally. The other nymphal specimen does not show this artifact.] Basis capituli ventrally (Fig. 4) with posterior margin convex. Palpi (Figs. 3, 4) 0.25, 0.23 long, segment 2 ca 2 x as long as segment 3; segments decreasing in size in the order 2, 3, 1, 4; setae as illustrated. Hypostome bluntly rounded and bulbous anteriorly; dental formula 2/2 throughout with several minute denticles forming an apical corona; ca. 6 teeth in each file diminishing to crenulations basally. Scutum (Fig. 1 , 5). Length 0.32, 0.33; width 0.4 1 , 0.45; outline as illustrated; evenly distributed; cervical grooves short, deep, directed posteriorly; eyes at lateral scutal angle, not bulging or encircled by coloration. Spiracular plate (Fig. 6) subcircular with slight
Amblyomma antillorum Kohls, 1969 (Acari: Ixodidae): description of the immature stages from the Rock Iguana, Iguana pinguis (Sauria: Iguanidae) in the British Virgin Islands
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