OLiS Vol. 79, pp. 53-56 23 May 1966 PROCEEDINGS OF THE BIOLOGICAL SOCIETY OF WASHINGTON A PSELAPHID BEETLE FROM THE GALAPAGOS ISLANDS (COLEOPTERA : PSELAPHIDAE ) ^ By Robert O. Schuster and Albert A. Grigarick Department of Entomology, University of California, Davis A single specimen of the beetle family Pselaphidae was collected during the University of California's Galapagos International Scientific Project.^ It represents the first record of the family in the Galapagos Islands. The individual is a male of Bythinoplectus, a genus having few species known from the West Indies and the continental Americas. Bythinoplectus peregriniis Schuster and Grigarick, new species Male: Yellowish-brown (Fig. 1 ), vestiture acuminate except in limited abdominal areas. Head from tempora to clypeus 200fj. long X 295jci wide ( including eyes ) ; vertexal foveae small, 8^ to lOfi in diameter, positioned anterior to front margin of eyes, separated by 87^, and each 87^ from nearest eye margin; apodemes extend from each vertexal fovea to 1 of 2 gular foveae, with a second apodeme connecting each gular fovea and an undefined location on side of head anterior to eyes; eyes of about 45 facets; frontal area with shallow longitudinal depression between anten-nal tubercules (typical of the female of most other species). Antenna of 9 segments ( Fig. 2 ) ; segment I with straight anterior margin and single large specialized seta ventrally in subapical area, posterior margin gently rounded; segment II subquadrate; flagellar segments essentially sunilar except for larger, distinctly conical segment VIII; segment IX with about 10 large lameUiform setae additional to normal setae; approximate mea-surements are: Segment I 100^ X 77^, II 47ai X 47^, III 23^ X 30m, IV 23fi X 26m, V 20m X 26^, VI 23m X 30m, VII 23m X 34m, VIII 26m X 40m, IX 118m X 80m. Maxillary palpus (Fig. 3) with segment I pentag-onal, 34m X 24m; II slender in basal %, abruptly expanded distally, 144m X 44m, with 1 very long seta distally; III 100m X 54m, with a very long subapical seta and a sharp median distal tooth; IV 94m X 37m, constricted medianly, with palpal cone 43m long. Mandibles curved, acute distally. ^ Contribution no. 23 from the Charles Darwin Foundation. 2 With support of National Science Foundation, grant GE 2370. 8— Proc. Biol. Soc. Wash., Vol. 79, 1966 (53)
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