460 PROCEEiDINGS OF THE NATIONAL MUSEUM tol. 94 



with tenth tergite (10) generally extensively produced forward be- 

 neath ninth tergite (9), uncleft basally, forming an uninterrupted 

 tergal plate ; left tergal process (10 LP) continuous with tergite, broad, 

 complex apically ; right process (10 EPi) large, cultriform, separated 

 from tergite at base by a thin, complete, transverse suture; bearing a 

 short, narrow appendix (10 KP2) at inner base. Right paraproct ob- 

 solete. Left paraproct (LPPT) present, fused along inner side with 

 side of process of ninth sternite (HP). Left cercus-basipodite (LCB) 

 well developed, complex, often sclerotic, bearing one or two inner lobes, 

 one of which is usually minutely bifid terminally. Basal segment of 

 left cercus nonechinulate, fused basally to LCB, sometimes deeply ex- 

 cised on inner side and apically clavate, or cylindrical. Right cercus 

 with basal segment usually cylindrical but at times emarginated and 

 sclerotic on inner side. 



Females. — Very few species having female specimens associated 

 with males are available in collections. All females so far known 

 have only one hind basitarsal sole-bladder. Although it is very 

 doubtful whether any facts of systematic importance can be gained 

 by a study of the females, it is possible that their identification may 

 be possible on the basis of color, size, head form, chaetotaxy of hind- 

 tarsus, and pigmentation of the eighth and ninth sternites of the 

 abdomen. 



Genotype. — Oligotoma livhbardi Hagen, by original designation. 



Distribution. — Warm-temperate and tropical America. 



Hahitat. — In bark of trees, at bases of epiphytes and saprophytes 

 growing on trees. See notes concerning vielanura., lobata., and van- 

 dykei. 



Remarks. — The species of Oligembia compose a very natural and 

 distinct genus, but they must often be separated by detailed characters 

 of the terminalia which are difficult to clearly express in keys. The 

 student will find such evidence as geographic distribution, combined 

 with a comparison of the male terminalia with the published figures 

 of each species, the simplest means of making determinations. The 

 few and scattered records of species indicate that more thorough 

 collecting should bring to light many additional new species. 



The present study of the greatly increased number of known species 

 of Oligerabia reveals that at least two major groups of species are 

 recognizable. These are at this time defined as subgenera. One 

 species, ho^wever, Oligemhia rossi Davis, of Panama, appears to pos- 

 sess such unusual characters that it is only tentatively assigned to the 

 first subgenus on the basis of the left cercus-basipodite structure. Its 

 tergal processes are unlike any other known species of the genus. 

 Oligemtia oligotomoides (Enderlein) appears to be a member of the 



