ee 
Fig. 19—A common foundation ant, 
Acanthomyops interjectus. 
queen; B, worker; C, winged queen. B 
and C, natural size. 
Natural History Survey Circular 39) 
Do: 
oa 
25) 
7A). 
20 
28. 
2 
30. 
ae 
A, winged 
(From Illinois 
Head somewhat heart shaped, as in Fig. 24 ..... oo 
Head not heartshapedms. -2-4--«-4 4-7 20 
Mandibles longer, as in Fig. 244 and B 
a eet, eno 3 an ee 22. Strumigenys 
Mandibles shorter, as in Fig. 24C' and D 
PhO era ee ee aa 23. Smithistruma 
Antennal scrobe extending to or beyond the pos- 
terior margin of the eye (Fig. 10 and F)...26 
Antennal scrobe not reaching the posterior margin 
Of the eyemoe 2 Meo tas Seek caret ee 27 
Yellow-orange ants with many deep longitudinal 
rugae on the head .......... 24. Wasmannia 
Brown ants with head dull but not markedly 
LUGOSE) eae ee ee ane 25. Harpagoxenus 
Epinotum without spines .....---+++++ sss 0 0: 28 
Epinotum with spines (Fig. SVR Gate ara Ge: 29 
Antenna with a distinct two-segmented club (Fig. 
LOBY) ech eee ats ras 27. Solenopsis 
Antenna without a two-segmented club (Fig. 10A) 
a Oe es os pee 3 ve 28. Monomorium 
(Fig. 10C, D, G, and Fei rea ee Se eee “el 
Head with strong longitudinal rugae, much as in 
Fig. 10, texture somewhat dull . .31. Myrmecina 
Head with only faint sculpturing, surface shiny 
Wa Ae hs tt We ar 26. Crematogaster 
Mesal portion of anterior margin of clypeus concave 
(Fig. 10L); ventral side of head with long 
curved hairs (Fig. 10K) ... 29. Pogonomyrmex 
Mesal portion of anterior margin of clypeus either 
produced, convex, or bilobed (Fig. 10M-Q) ; 
ventral side of head without such long curved 
ee ae lew 8 oe ae we 0 Me 0, coke es Sg SaaS ee 
39 Posterior border of clypeus with a distinct semici! 
LOG) nes ett ee rr 34. Myrmic 
Posterior border of clypeus with either a short, sha 
low depression (Fig. 10M), or its margin mer; 
ing smoothly into rest of head (Fig. 10N) 
epinotum with smaller or inconspicuous flange : 
base of petiole (Fig. 10C) 
see 0 6 8 8 8 6 6 en 
33. Pedicel extending far above dorsal margin of hez 
(Fig. 10P) .s..... 2-2 30. Aphaenogast 
Pedicel not extending above dorsal margin of hee 
(Fig. 100) 
wee ee ee @ we fa fe pl etae Yente” loll (ellie) Kei=sie ei ae 
34. Dorsal aspect of second segment of petiole about 
wide as long, its sides nearly straight (F 
LSE) vc... 55 esse oe oe | 
Dorsal aspect of second segment of petiole abo 
twice as wide as long, its sides angulate (F 
15D) ..cccc eee esos os 
35. Eyes as large as in Fig: 15B....... 36. Leptothor 
Eyes smaller, as in Fig. 15C....... 32. Stenamr 
36. In lateral view, long axis of eye nearly parallel 
long axis of head (Fig. 15F) .. 35. Tetramorit 
In lateral view, long axis of eye markedly tangent 
to long axis of head (Fig. 15G) ... 33. Pheid 
KEY TO SUBFAMILIES AND GENERA (MALES) 
1. Petiole-of,two segments ......../7= =] 3=siE 
Petiole of only one segment .......++++++9*% 
2. Eyes elongate and bean shaped; clypeus not exte 
ing close to bases of antennae (Fig. 16D) (s 
family Pseudomyrmecinae ) 
Eyes relatively small, ovoid, or hemiovoid (Fig. 2 
oe 6 we wo 0, 0) 5 Oe 
