150 NEOTROPICAL PSELAPHIDAE 



prominent, transverse, truncate lamina at center, just behind the constriction; 

 VI as large as fifth, articulated at an angle with fifth to give antennae a sub- 

 geniculate appearance, the dorsal face simple, elongate, the ventral face with 

 a long, slender, very capitate appendage extending from basal margin and 

 seeming to arise from the fifth segment unless observed with care, also a short, 

 acute, arcuate cusp arising from the ventral face just anterior to the capitate 

 appendage noted, and partially covered by the latter; anterior to this cusp 

 the ventral face is expanded ventrally and bears a median, arcuate, longi- 

 tudinal lamina; VII-X excentrically articulated; VII strongly and VIII 

 weakly narrowed mesially, of nearly equal length and width; IX slightly 

 longer than eighth, of same width, with the non-articular portion drum-shaped; 

 X subclindrical, as long as eighth and ninth united and slightly wider than 

 ninth; XI as long as ninth and tenth united, basally truncate, apically sub- 

 sinuate to bluntly narrower apex. The dorsal faces of the fifth and sixth seg- 

 ments are similar to those of diversula Raffray and appendiculata Raffray, 

 and the remarkable anatomy of the ventral faces of the fifth and sixth seg- 

 ments is strikingly like the condition in appendiculata Raffray. 



Pronotum with form typical of genus; a large pubescent, subbasal fovea 

 on each side, and a minute, nude, punctiform median basal fovea, these foveae 

 wholly free and unconnected by transverse sulcus ; disc simple and unmodified. 



Elytral form typical of genus; each elytron with but two basal foveae, 

 these foveae circular, large; the sutural fovea at base of the well-formed 

 sutural stria; the discal fovea at base of the long, arcuate discal stria which 

 extends to apical fifth. Scutellum distinct. Wings long and well-formed. 



Sternal foveae II, III, IV, and VI well-formed and with their orifices 

 covered by long setae, foveae IV especially large and transverse. The metaster- 

 num medianly concave and pubescent, with the margins of the concave area 

 moderately prominent; lateral areas of metasternum are glabrous. 



Abdomen with the first visible tergite bearing at base two straight, diver- 

 gent carinae; these basal carinae are short, being only one-fifth as long as 

 segment, and separated by one-third of the width of the segment. Last stemite 

 medianly slightly depressed. 



Legs simple with exception of the intermediate coxae. Each of these coxae 

 bears a short, acute spine at its mesial-posterior angle. 



Described on two male specimens, both collected by the author at light 

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

 male at 10:00 p.m., July 17, 1936, and the paratype male at 10:00 p.m., 

 July 28, 1936. Named for my friend. Dr. Strohecker. 



There is either a striking case of genetic parallelism of the antennal 

 abnormalities of the male sex, or a taxonomic imbroglio involving groups 52 

 and 56. After considerable thought I have decided the former condition exists, 

 at least to the extent that appendiculata Raffray and stroheckeri are dis- 

 tinct. However, certain remarks must be set down to aid future students. 

 David Sharp (1887, p. 29 and PI. I, fig. 14) described Bryaxis diversa from 

 Panama, based on seven examples taken from the sandy banks of streams 



