154 NEOTROPICAL PSELAPHIDAE 



expanded into a dilated plate extending apically beneath the antennae as far 

 as the second segment, and laterally nearly to the eye margin to give a width 

 subequal to the total head width through the eyes. This dilated epistomal area 

 is simple in the female and bears a median, apically setose, triangular horn 

 or tubercle in the male sex. 



convexa (Schaufuss). 1879. (Bryaxis). Brazil; Dutch Guiana. 



BUNODERUS (Raffray, 1904) 



This genus, allied to Brachygluta and Reichenbachia, is distinct in the 

 neotropical part of the tribe by having the pronotum with the disc crossed 

 longitudinally by a median carina or carinoid gibbosity. In this it occupies an 

 analogous position to the Brachyglutini, that Neodalmus occupies in the 

 Euplectini. 



Key to the Species 



Disc of pronotum with a strong, entire, median longitudinal carina 

 carinicollis (1.6 mm. Based on Female) 



Disc of pronotum with the median longitudinal carina obsolete, re- 

 placed by a carinoid, longitudinally gibbous swelling 2 



2. Metasternum with a wide, entire longitudinal, median impression the 

 sides of which are carinated longipilis Male 



Metasternum widely, less deeply sulcate, the sides not thrown into 

 carinae longipilis Female (species 1.5-1.7 mm. long) 



carinicollis Raffray. 1904. Mexico. 

 longipilis Raffray. 1904. Brazil. 



STROMBOPSIS (Raffray, 1904) 



A monotypic genus allied to Xybaris, Xybarida, and Cryptorhinula on 

 the one hand but considered more primitive than this group of genera on 

 general anatomy as described. 



breviventris Raffray. 1904. Brazil. 



ACHILLIA (Reitter, 1890) 



This large genus, named for Raffray by Reitter in 1890, has an odd distri- 

 bution. Out of twenty-five known species, twenty-four are found in Chile and 

 one in Cuba! In its concentration in Chile, this pattern reminds one of the 

 concentration of Ldoplectus in the Euplectini with seven species known, all 

 from Argentina. 



The elytron has either two or three basal foveae (not two foveae as stated 

 by Raffray, 1908). The body is elongate, subparallel and flattened. The sub- 

 quadrate head has the front transversely sulcate and diversely impressed and 

 armed, especially in the male sex. In eljridae the vertexal foveae are on a 

 level with the anterior margin of the eyes, while in clavata the foveae are far 



