200 NEOTROPICAL PSELAPHIDAE 



schaufussi Raffray. 1904. Santarem, Amazonas, Brazil. 

 suturale (Schaufuss). 1879. Mexico. 



tropicum Fletcher. 1928. Vera Cruz, Vera Cruz, Mexico, and Ta- 

 maulipas, Mexico. 



XIII 



gracilicorne Fletcher. 1928. Vera Cruz, Vera Cruz, Mexico. 

 longicorne Raffray. 1904. Amazonas, Brazil. 



XIV 



frontale Raffray. 1904. Colombia. 



Subgenus Decafuss new subgenus 



euspinifrons new species. Panama Canal Zone, con Eciton burchelli 



Westw. 

 monoceros (Schaufuss). 1882. Paramaribo, Dutch Guiana. (Bryaxis) 



Unplaced 



aurivillii (Schaufuss). 1882. Dutch Guiana. (Bryaxis) 



Identicorne (Schaufuss). 1880. Yucatan, Mexico. {Bryaxis denticornis) 



saucium Raffray. 1908. Paraguay. 



Before taking up the few remaining brachyglutine genera, I have drawn up 

 a key to the three new species of Decarthron and the new species of Drasinus. 

 This is done since they are the only brachyglutines with ten-segmented antennae 

 reported from Barro Colorado Island and form a group with superficially sim- 

 ilar facies: 



Key to both sexes of Barro Colorado Decarthron and Drasinus 



Ventral surface of head with median longitudinal carina 2 



Ventral surface of head with median ovate fossa 3 



2. Third visible stemite with four elevations, a lateral pair relatively 



low, broad and lightly pubescent and a median pair relatively high, 



narrow and densely tufted Drasinus cisinsularis Male 



Third visible sternite simply convex .... Drasinus cisinsularis Female 



3. Front produced into an anteriorly directed horn between antennal 



bases Decarthron euspinifrons Male 



Front not produced into a horn 4 



4. Maxillary palpi swollen ; pronotum with three subbasal foveae 



Decarthron euspinifrons Female 



Maxillary palpi normal; pronotum with a single median fovea, no 

 lateral foveae 5 



5. Intermediate femora swollen, excavated on dorsal and posterior faces 6 



