JAMES CHESTER BRADLEY 
259 
Subgenus Brachycistis Fox 
A Key to the Species of the Subgenus Brachycistis known 
TO OCCUR IN America north of IMexico 
Males 
1. Fore-wing with cell R4 enclosed, therefore 3 submarginals present (figures 
9 and 20) (4) 
Fore-wings with R4 not enclosed, therefore only two submarginals present 
(figure 5) (2) 
2. Occiput not separated from the vertex by a carina; ocelli small, the di- 
ameter of the posterior pair equal to one-third of their distance from the 
compound eyes; cell 2d Ri -f R2 very small, linear, ending before the 
apex of the stigma (figure 20) perpunctata Cockerell 
Occiput separated from the vertex by a carina; ocelli large, the diameter 
of the posterior pair equal to their distance from the compound eyes; 
cell 2d Ri -f- R2 small but not hnear, ending at or slightly beyond the 
apex of the stigma (figure 9) (3) 
3. Lateral angles of the propodeum rounded, not prominent, evenly, not 
rugosely punctured; r-m inserted closely apicad of m-cu, or sometimes 
opposite or even basad thereof (figure 9) eremi new species 
Lateral angles of the propodeum prominent, somewhat angular, rugose, 
in part reticulate; r-m usually inserted about midway between m-cu 
and Ms + 4, sometimes nearer the latter, and sometimes nearer the 
former, but rarely close to m-cu and never opposite or basad thereof. 
brevis Fox 
4. Front wing with r-m inserted on M close to m-cu, the cell Rs therefore 
elongate (figures 7 and 10) ; abdomen sessile (5) 
Front wing with r-m inserted on M close to Ms + 4, the cell Rs short and 
triangular (figure 5) (8) 
5. Posterior margin of the squama deeply notched, so that it is somewhat 
biramose (figure 24) (6) 
Posterior margin of the squama entire (figure 31). 
thermarum new species 
6. Coal black, with white pubescence; the diameter of the posterior ocelli 
approximately equal to one-half of their distance from the compound 
eyes stygia new species 
Castaneous; the diameter of the posterior ocelli equal to their distance 
from the compound eyes (7) 
7. Second ventral segment without a transverse ridge; pygidium bounded bj' 
sharp lateral carinae and with a raised median longitudinal fold, the 
interstices considerably depressed; lower margin of the antennal socket 
simple; squama acute; uncus neither recurved not bifid (figure 27). 
castanea (Cresson) 
TR.^NS. am. EXT. SOC., XLIII. 
