184 NEOTROPICAL PSELAPHIDAE 



beyond middle of elytral length. Humeri prominent and rounded. Elytral 

 flanks with no subhumeral fovea and no longitudinal carina or stria. 



Abdomen with five tergites visible, first with a narrow but strong lateral 

 margin. First tergite as long as other four united, with a pair of slightly 

 divergent discal carinae two-thirds as long as segment and separated by one- 

 half the segmental width. Five sternit^s medianly visible, the true first being 

 hidden by the posterior coxae and the metastemum. First visible stemite twice 

 as long as the remaining sternites united; second visible laterally but not 

 medianly; third visible sternite (morphologically the fourth) strongly modi- 

 fied as follows: the segment has four elevations, a lateral pair which are 

 relatively low and broad and lightly pubescent, and a median pair of elevated 

 protuberances which are relatively high and narrow, each of these median 

 elevations bearing a tuft of long setae; fourth visible stemite very short and 

 medianly flattened; fifth visible (last sternite) with the apical margin medianly 

 produced into a rounded lobe and medianly flattened, save at the middle of the 

 basal margin which bears a minute, rounded tubercle. 



Mesostemum extended between the intermediate coxae as a subtruncate 

 plate, these coxae therefore clearly separated. Metasternum large, extending 

 between the intermediate coxae as a subtruncate plate to reach the mesostemal 

 extension. Sternal foveae IV and V large and pubescent. Metasternum between 

 pair V slightly tumid and in the shape of a spear-head, with the apex of the 

 spear continuing posteriorly as a median longitudinal striaform depression. 

 The area just anteriad and mesiad of the articulation of the posterior legs 

 also slightly tumid. Metaepistemal-metastemal sutures and metaepistemal 

 sclerites well-formed. Posterior coxae distant. 



Anterior and intermediate legs simple; posterior tibiae slightly swollen 

 and slightly arcuate in apical third, with the ventral surface flattened and 

 bearing a patch of dense pubescence at apical sixth. 



Allotype Female. Similar to holotype male save that the sternites are 

 simply convex and not modified in any way, consequently it is much easier to 

 count the five visible ventral segments. 



Described on seven specimens collected by the author at light at night 

 on Barro Colorado Island, Gatun Lake, Panama Canal Zone. The holotype 

 male, allotype female, one male and one female paratype on July 7, 1936, at 

 10:30 p.m.; one female paratype on July 8, 1936; one male paratype on July 

 17, 1936; one male paratype on July 28, 1936. All were taken near the island 

 laboratory save the female of July 8 which was taken at the south-eastern end 

 of the island, near Bangs Casa. 



This distinct species is allied only to hirsutus, from which it may be dis- 

 tinguished by the non-rugose clypeus and wholly different modifications of 

 the male sternites. 



The species may be listed as follows: 



Subgenus Drasinus s.s. (Raff ray, 1904) 



binodulus Raffray. 1904. Mexico. Genotype, {nodicornis Fletcher, 

 1928, nee Raffray) 



lewisi (Raffray). 1904. Brazil. (Euteleia) 



