108 
Psyche 
[June- Sept. 
them, as well as several other species described 6 since the 
publication of Smith’s paper. 
Key to Workers of Strumigenys, subgenus Cephaloxys of the 
United States. 
1. Dorsal surface of first gastric segment clearly sha- 
greened, subopaque ; infraspinal lamella absent 
margaritx Forel. 
Dorsal surface of first gastric segment smooth and 
shining; infraspinal lamella present 2 
2. Prothorax not only flattened, but also very strongly 
marginate laterally ; head almost destitute of pilosity 
except for a pair of short, more or less erect, club- 
like hairs on the vertex. 
membranifera simillima Emery 
Prothorax not as above; head covered more or less 
abundantly with varied types of pilosity ... 3 
3. Sides of head as viewed from the front evenly and 
smoothly converging to the apices of the mandibles. 
4 
Sides of head subparallel or only slightly converging; 
external border of mandibles not lying on an ante- 
rior projection of the sides of the head 15 
4. Clypeus very acute anteriorly ; clypeal hairs few, long, 
erect, thickened, confined principally to the median 
anterior portion of the disk .... deitrichi M. R. Smith 
Clypeus distinctly not as above 5 
5. Clypeus smooth and shining 6 
Clypeus opaque or subopaque 8 
6. Clypeal hairs short, curved, apically enlarged 
brevisetosa M. R. Smith 
^Kennedy, C. H., and Schramm, M. M., 1933, A New Strumigenys with 
Notes on the Ohio Species, Ann. Ent. Soc. Amer., 25, pp. 95-104. 
(S. ohioensis) 
Weber, N. A., 1934, A New Strumigenys from Illinois, Psyche, 41, 
pp. 63-65. (S. talpa) 
Smith, M. R., 1935, Two New Species of North American Strumi- 
genys, Ann. Ent. Soc. Amer. 28 pp. 214-216. (S. rohweri, S. 
brevisetosa ) 
