42 
Psyche 
[March 
F. borgmeieri is very similar in general appearance to F. alvarengai, 
sharing with it several characters (given in key) which are not found 
in F. wheeleri. F. borgmeieri is easily distinguished from alvarengai 
by the presence of a ridge between the antennal fossae, 2 pencils of 
hairs on the hind tibia, somewhat shorter antennae, and a less swollen 
clypeus. Since the specimen of alvarengai cannot be sexed, it has 
occurred to us that the two forms may represent male and female of 
a single species; the two forms are, however, separated by several 
characters of the type that are not involved in sexual dimorphism 
elsewhere in the Ptinidae. The two species 1 are closely related, and 
when more material is studied, they may prove to be geographic 
races, which, like Gnostus formicicola and G. meinerti , occur on 
either side of the Rio Amazonas. 
Fabrasia wheeleri, new species 
(Figs. 8— 12 ) 
description : Reddish-brown with blackish elytral spots, which are 
larger and fewer in number than in borgmeieri ; clothed with very 
short yellowish elytral bristles; elytra with accumulations of white 
Fig. 15. Geographic distribution of the species of Gnostus and Fabrasia. 
