48 NEOTROPICAL PSELAPHIDAE 



5. Antebasal platform transverse and prominent 6 



Antebasal platform a minute, transverse tubercle 



dilatata Raffray (male known only) 



6. Antebasal platform a prominent, transversely rhomboidal tubercle 



lamellata Raffray (male known only) 



Antebasal platform a prominent, transverse, amphidiscal or dumb- 

 bell shaped process, slightly narrower and sulcate medianly 



notonoda new species (male known only) 



The species of the genus Sebaga may be listed as follows: 



centralis Raffray. 1890. Venezuela. Genotype. 

 denticollis (Schaufuss). 1872. Mexico. (Jubus) 

 dilatata Raffray. 1893. Brazil. 

 lamellata Raffray. 1893. Mexico. 

 notonoda new species. Panama Canal Zone. 

 raffrayi new species. Panama Canal Zone. 



scydmaenilla (Sharp). 1887. Senahu, Guatemala (Sharp). Also from 

 Barro Colorado Island, Panama Canal Zone. 



JUBUS (Schaufuss, 1872) 



This the typical genus of the tribe; it has a very wide geographic distri- 

 bution and many species. Although the species vary in the details of antennal 

 segment proportion and shape, and in features of the pronotum and elytra, 

 the habitus is common to the genus as a whole. Jubus may be easily separated 

 from its ally, Sebaga, by the shape of the head and the amount of separation 

 of the bases of the antennae as set forth in the tribal key to genera. The mouth 

 parts of the genus have been described in some detail (Raffray, 1908, p. 25), 

 and various aggregates {Duciola Reitter, Gasola Reitter, Gamba Schaufuss) 

 have been incorporated in Jubv^ by Raffray (1903), so that the genus appears 

 to be a natural assemblage, in so far as one may determine such a thing by 

 assay of morphological details alone. 



Sexes in Jubus are readily separated by a number of contrasting features. 

 For example, the eyes of the female are distinctly smaller, and are composed 

 of significantly fewer facets; the male generally has the ventral surface of 

 the abdomen variously modified and concave, whereas the female usually has 

 the abdomen simple and more or less evenly convex. Males may or may not 

 have the legs armed with teeth or spines, but the females as a general rule 

 have the legs simple. 



Raffray (1903) has separated Jubus into seven groups of species, and this 

 separation I have modified in a few respects to divide the genus into the 

 Raffrayian categories, as follows: 



First tergite very large, from one-third to twice as long as the second 

 tergite 2 



