466 BULLETIN 18 2, UNITED STATES NATIONAL MUSEUM 



traces of ground sculpture. Male, eighth sternite with a small emar- 

 gination three times as wide as deep. Female, eighth sternite rounded. 

 Length, 2l^ to 3i/^ mm. 



Type locality. — Trinidad, mouth of cave in Aripo Valley; elevation 

 2,600 feet. 



Types. — Holotype and one para type (females) in the Museum of 

 Comparative Zoology; one paratype (male) in the United States Na- 

 tional Museum (No. 52530) ; collected April 19, 1935, by N. A. Weber. 



Records. — The following is the only record known to me : 



Trinidad: Aripo Valley (Weber, in M.C.Z. and U.S.N.M.). 



Specimen.^ examined. — I have seen only the three types. 



Rennarks. — This species is at once distinguished from H. ramhouseki 

 by the very large eyes which occupy most of the sides of the head. 

 This development also forces the infraocular ridge onto the ventral 

 surface of the head. In details of sculpture and in appearance the 

 two species differ little. 



The types were found at the mouth of a cave, but I have received 

 no other record of their habits. 



LXXV. Genus ACYLOPHORUS Nordmann 



Acylophorus Nordmann, 1836, p. 127. 

 Rhijffmacera Motschxtlsky, 1845, p. 40. 

 Rhegmacera Fauvel, 1895, p. 275 (misspelling). 



Genotype. — A. ahrenmi Nordmann (designated here) ; the citation 

 as type of A. gldberrinius (Herbst) by Bierig in 1938 can be recognized 

 only through the synon3miy of ahremii and glaherrimus. Of Rhyg- 

 iruicera, R. nitida Motschulsky (monobasic). 



Diagnosis. — Head and pronotum without dense and umbilicate 

 punctures, margined beneath the eyes; antennae widely separated at 

 front of head, strongly geniculate at the first joint, segments densely 

 pubescent from the third joint; labrum transverse but rounded, with 

 a few long setae; mouth-parts not very long or very slender, fourth 

 segment of maxillary palpus enlarged and either truncate or acumi- 

 nate, labial palpus with second and third segments much enlarged 

 and flattened, forming a distinct club; gular sutures separate but 

 approximate near base; lateral margin of pronotum single; anterior 

 coxal cavities open behind ; front coxae large, exserted ; posterior coxae 

 contiguous, "triangular," with a small expansion over the base of the 

 femur; first and second abdominal sternites absent, except for a rem- 

 nant of the second at the side ; femora unarmed ; all tarsi 5-segmented ; 

 the sexes usually not externally distinguished. 



Remarks. — This rather small genus is found in most parts of the 

 world but the species are usually not widespread. It is distinguished 

 from IleterotJwps principally by the structure of the mouthparts. 



