BATRISINI 253 



This is a bizarre representative of a fauna notable for its morphological 

 diversity. It is very distinct from other members of the genus in many details. 

 Of the five species, three {dimidiatus, puncticollis and simplex) have both sexes 

 known, and the proportions of the third to sixth ant^nnal segments are similar 

 for both sexes of a species. The fourth species {incertus) is known only from 

 the female sex, and barberi only from the male sex but barberi is the only one 

 of the five having segments II to VIII longer than wide and I assume that 

 the female, when discovered, will have elongate antennal segments. The 

 genotype, simplex, unfortunately does not represent the genus morphologically, 

 it being the only species without a cribrate pronotum. 



The species may be listed as follows: 



simplex Sharp. 1887. Volcan de Chiriqui (2000-4000 feet), Panama. 



Genotype. 

 puyicticollis Sharp. 1887. As for genotype. 

 dimidiatus Raffray. 1904. Yuracaris, Bolivia. 

 incertus Raffray. 1904. Amazonas, Brazil. 

 barberi new species. Corumba, Matto Grosso, Brazil. 



EUPHALEPSUS (Reitter, 1883) 



Reitter (1883, 1885, 1888) 



Sharp (1887) 



Raffray (1887, 1890, 1904, 1908, 1909, 1911, 1917) 



Fletcher (1927) 



Park (1933) 



This is an exclusively neotropical genus with the exception of a single 

 doubtful record, namely Euphalepsus dentipes Raffray (1904, p. 184) ques- 

 tionably cited from Louisiana. With this exception there are 24 species: Mexico 

 (2), Guatemala (1), Costa Rica (1), Panama Canal Zone (1), Panama (1), 

 Colombia (1), Venezuela (2), Brazil (13) and Paraguay (2). As in so many 

 neotropical aggregates Brazil appears to be the center of speciation. 



This is a genus of large, highly specialized species. The species are easily 

 recognized, their size, globular form, uncarinated metasternum and especially 

 the callus at each elytral humerus differentiate them from other pselaphids. 

 As yet nothing is known concerning their ecology. 



Raffray (1904) has divided the genus into groups and this plan is fol- 

 lowed here: 



Key to Neotropical Groups 



Humeral callus very pronounced, abruptly formed and extending on 

 the elytra beyond the humeral margin (PI. XVIII) 2 



Humeral callus much less pronounced, apically narrowed, less abinjptly 



formed and restricted to the humeral margin Group V 



2. Humeral callus apically extended on the elytra as an acute triangular 

 wedge or a carina Group I (PI. XV) . 



