and H) ; clypeus extending dorsally almost to or 
above level of antennal bases (subfamily Myr- 
PRECINNG MO eee ee arecly, ho eberl 23 
3. Subgenital plate elongate, with two or three apical 
teeth (Fig. 16C, E, and F) ; front wing with cell 
M long, vein Cu; with a sharp bend at cross- 
vein m-cu, and Cu, distinct and sclerotized 
(Fig. 164) (subfamily Ecitoninae) ......... 5 
Subgenital plate without apical teeth; front wing, 
if present, with cell M much shorter or open, 
vein Cu; with only a slight curve or none at 
crossvein m-cu, which is sometimes atrophied, 
and Cuj, usually forming only an indistinct apex 
Perio 16B ale ee eee 4 
+. A pronounced constriction between first and second 
gastric segments (Fig. 7C, E, and 1) (subfamily 
BREA) MBER celal pr Wud x. eS: 6 
segments (Fig. 84 and B; Fig. 9B) (subfamilies 
Dolichoderinae and Formicinae) ........... 10 
Subfamily ECITONINAE 
3. Tarsal claws with a tooth (Fig. 17A) .. 1. Labidus 
Tarsal claws simple (Fig. 17B) .. 2. Neivamyrmex 
Subfamily PONERINAE 
MS eh eee cane. 4. Ponera 
Bil eS ee y 
7. Metanotum with a dorsal spine CSR LOL ene. es 8 
Metanotum without a spine .................. 9 
8. Petiole rectangular or angulate at apex in lateral 
ONT 5. Proceratium 
Petiole rounded at apex in lateral view 
ea eke ine eee y 6. Sysphincta 
9. Clypeus with minute teeth (Fig. 16£) 
oe oie ee hs 3. Amblyopone 
Clypeus without teeth (Fig. 16F) ...... 4. Ponera 
Subfamilies DOLICHODERINAE and FORMICINAE 
10. Antenna 10-segmented: pale cream colored ants 
os 11. Brachymyrmex 
11. Second segment of funicle longer than body of scape 
OP) ee da kee. 9. Iridomyrmex 
Second segment of funicle about the same length 
as or shorter than body of scape ........... 12 
12. Third segment of maxillary palp as long as segments 
ify 
4,5, and 6 combined ........ 8. Dorymyrmex 
Third segment of maxillary palp much shorter than 
segments 4, 5, and 6 combined ......,..... ib) 
14. Body of scape shorter than the combined lengths of 
Sh oe eae rn er te 7. Dolichoderus 
Body of scape as long as or longer than the com- 
bined lengths of the first three funicular seg- 
INCH tS eee eon ieee ta » Sie hee 15 
15. Mandible sickle shaped, without distinct teeth (Fig. 
PCAN an iter: Fe eee ee 16. Polyergus 
Mandible somewhat triangular, sometimes with 
Cecth otek coin cin oe chal. oe ae RG 16 
16. Anterior face of the gaster flat or convex ....... Ly 
Anterior face of the gaster dished out and concave, 
forming a shallow cavity into which the petiole 
IL USSLELIEC DOSE aap alta tenon Sam oars pid Set, Sapa ia Lg 
asthe ASE MU COE aise A kt etn 9. Iridomyrmex 
Body of scape much longer than combined lengths 
of first four funicular segments; body length 
SLO prints Oh = aaaee see 2 hateerpuniane ie 18 
18. Antennae inserted at a distance from the posterior 
margin of the clypeus........ 15. Camponotus 
Antennae inserted close to the posterior margin 
otter cly pens ans oer Cane wn 14. Formica 
19. Body of scape shorter than the first four funicular 
scements combineds wt. aaa 17. Prenolepis 
Body of scape longer than the first four funicular 
See entssCOmDIN 6d mean Gan 20 one 20 
20. Petiole upright and high.............. 13. Lasius 
Petiole inclined forward and lower ............ 74) | 
21. Mandible with many microscopic teeth (Fig. 160.) 
eine ener ae aaeee: BR bea Ato. us 10. Tapinoma 
Mandible with larger and fewer teeth (Fig. 16C) 
SR RE AY. RE AORR aa eee ae 18. Paratrechina 
Subfamily PSEUDOMYRMECINAE 
22a On one gence eee n ee 19. Pseudomyrmex 
Subfamily MYRMECINAE 
23. Antenna 10 segmented ......... 35. Tetramorium 
Antenna with more than 10 segments .......... 24 
24. Head and body with many erect long hairs (Fig. 
Fig. 20.—Winged female of the large 
black carpenter ant, Camponotus penn- 
sylvanicus. (From USDA) 
