110 
Psyche 
[June- Sept. 
Head narrower; mandibles slightly more than y the 
length of the rest of the head ; posterior border deep- 
ly excised ; toothless space of mandibles small and in- 
distinct. (PI. 3, fig. 1.) medialis sp.n. 
15. Mandibles longer, 1/3 the length of the rest of head, 
clypeus truncate or emarginate or very broadly flat- 
tened anteriorly 16 
Mandibles shorter; clypeus variable 17 
16. Clypeus decidedly truncate anteriorly, thus giving the 
head a subrectangular appearance; antennal scapes 
not only short but very strongly angulate basally . . 
angulata M. R. Smith 
Clypeus, although moderately truncate anteriorly, not 
enough to give a decidedly subrectangular appear- 
ance to the head; scapes longer and less angulate 
basally pergandei Emery 
17. Clypeus truncate or subtruncate in front 18 
Clypeus broadly rounded in front 21 
18. Mandibles with large coarse teeth on their entire inner 
borders; clypeus broadly truncate or slightly emar- 
ginate ro strata Emery 
Mandibles toothed on only a part of their inner bor- 
der; clypeus truncate but never emarginate 19 
19. Mandibles longer, 1/4 to y the length of the rest of 
head ; clypeus very short and broad, the sides gently 
convergent (PI. 3, fig. 6) abdita sp.n. 
Mandibles shorter, y the length of the rest of head; 
clypeus longer, the sides more strongly convergent 
20 
20. Hairs on head rather abundant, distinctly squamiform 
creightoni M. R. Smith 
Hairs on head less abundant, longer, and, although 
slightly enlarged apically, not squamiform 
sculpturatci M. R. Smith 
21. Sides of anterior portion of head gently and evenly 
convergent to the very broadly rounded clypeus; 
mandibles nearly y the length of the rest of head 
PI. 3, fig. 5) venatrix sp.n. 
