JUBININI 47 



beneath the loose bark of a prostrate log on the forest floor, on July 27, 1936. 

 The second specimen was taken by Dr. E. C. Williams, Jr., from a sample of 

 floor mold (No. 1433) on July 12, 1938. 



The genus Sebaga is known imperfectly because the majority of the 

 descriptions are based on one sex, or the sexes are not differentiated. Such a 

 situation makes analysis difficult. Apparently the females have the sixth sternite 

 simple, evenly convex, whereas the males have this sternite variously concave. 

 Sharp described his single specimen in the genus Duciola, but Raffray (1908, 

 p. 29) placed scydmaenilla in Sebaga. This species does not have the con- 

 spicuous antebasal platform which was stated as characteristic of the genus 

 Sebaga by its author (Raffray, 1890, p. 300 and 1908, p. 29). RafTray must 

 have known that the antebasal platform was lacking in scydmaenilla when he 

 placed this species in Sebaga, and hence certain possibilities are available for 

 study: (1) Sebaga may include species with and without the antebasal plat- 

 form in both sexes, in which case subgeneric division would be admissable; 

 (2) the antebasal platform may be diagnostic for males and lacking in all 

 or some females; (3) the genus may have the antebasal platform in all 

 species and both sexes, in which case scydmaenilla (Sharp) is misplaced; (4) 

 the third possibility may be the true one, but Raffray studied the type of 

 scydmaenilla and found that it had the platform but that it was overlooked 

 by Sharp. This latter is hardly tenable, since Sharp would almost certainly 

 have noted in his figure the presence of such a prominent feature. 



Key to the Species (PI. XV) 



Pronotum with a median tubercle, antebasal platform or spinoid 

 process just anteriad of, or associated with the transverse sulcus. . . 2 



Pronotum with no median tubercle, antebasal platform or spinoid 

 process scyd7naenilla (Sharp) (females known only) ^ 



2. Antebasal platform dorsally slightly concave, glabrous and shining, 



with carinated edges which project beyond the supporting column. . 3 

 Antebasal platform not so formed, tuberculate, spinoid, or transverse 

 but without overhanging carinated margins 4 



3. Antebasal platform perfectly circular from above 



centralis Raffray (male known only) 



Antebasal platform transversely ovate from above 



raffrayi new species (male known only) 



4. Antebasal platform a strong spinoid process or tooth 



denticollis (Schaufuss) (sex of type unknown) 



Antebasal platform not spinoid or tooth-like 5 



* It is perfectly possible that the two females which I have identified as scydmaenilla 

 are in reality females of raffrayi, but I am loath to associate males with females arbitrarily 

 in the same species unless there is substantial data for such an allocation; it is definitely 

 certain that they are not females of notonoda in view of accumulative morphological 

 evidence on many characters. 



