1939] Notes on Strumigenys 109 
Clypeal hairs long, *4 to Vs times the width of the 
clypeus 7 
7. Edge of clypeus in profile entire ; clypeal hairs straight, 
thin, abundant ; hairs on vertex sparse, hardly 
clavate clypeata var. laevinasis M. R. Smith 
Edge of clypeus in profile deeply grooved ; clypeal hairs 
sparse, curved, slightly enlarged apically; hairs on 
vertex numerous, shorter, clavate (PL 3, fig. 2) 
bimarginata sp. n. 
8 . Clypeus with a few, long hairs, very much enlarged 
apically and principally on the anterior portion of 
the disk and also a pair of long, thick, recurved, but 
not suddenly enlarged hairs, posteriorly ornata Mayr 
Clypeal pilosity distinctly not as above 9 
9. Clypeal hairs straight, imperceptibly or not at all en- 
larged 10 
Clypeal hairs curved, distinctly clavate or squamose 11 
10. Clypeal hairs short, not over % as long as the width of 
the clypeus ohioensis Kennedy and Schramm 
Clypeal hairs long, 1/3 to % the width of the clypeus . . 
pilinasis Forel 
11. Clypeal hairs short, squamose, appressed 12 
Clypeal hairs longer, more or less erect, clavate or 
narrowly squamose 13 
12. Clypeus broadly and evenly rounded; the surface in 
large part concealed by the squamose hairs 
clypeata Roger 
Clypeus very broadly rounded, appearing somewhat 
truncate; clypeal surface almost entirely concealed 
by the spatulate hairs rohweri M. R. Smith 
13. Clypeus rather sharply truncate in appearance; man- 
dibles 14 the length of the rest of head (PI. 3, fig. 3) 
manni sp. n. 
Clypeus broadly rounded, not truncate ; mandibles 
shorter 14 
14. Head broader; mandibles less than ifs the length of 
the rest of the head ; posterior border of head shal- 
lowly excised; toothless space of mandibles distinct 
talpa Weber 
