Fig. 8—Diagnostic parts of worker ants of the subfamily 
Dolichoderinae. A, Tapinoma, side view; B, Dolichoderus, side 
view of thorax and abdomen—f, dorsal process; C, Iridomyr- 
mex, side view of thorax and abdomen; D, Dorymyrmex, side 
view of thorax and abdomen; E, Dolichoderus, dorsal view of 
thorax and petioles—p, dorsal process; F, Dorymyrmex, side 
view of head—l, labial palp; m, maxillary palp. 
rc 
15. Maxillary palp with three or four segments 
Rs Ro are ees: 12. Acanthomyops 
Maxillary palp with five or six segments ........ 16 
16. Mesopleuron with a distinct ridge near anterior ven- 
tral portion (Hig? 9B gee. 15. Camponotus 
Anterior margin of mesopleuron rounded, without 
ja olsxcnae at Pyrenees Muy Rae Goon 17 
17. Node of petiole low and sloping anteriorly, the whole 
petiole forming a low triangle (Fig. 9D, FE, and 
GPR gee en eee ee 18 
Node of petiole upright, petiole forming a high tri- 
angle (Fige9G and. b \) tyme) eer eae 19 
18. Thorax viewed from the side having a distinct con- 
striction or “neck” near middle (Fig. 9G) 
ORD Rae Daerah bcs Ws ves ares «SE 17. Prenolepis 
Thorax viewed from the side having no such distinct 
constriction or “neck” (Fig. 9D and E) 
Hei abe he nc yer eer eae 18. Paratrechina 
19. Clypeus shorter, as in Fig. 14C, with an indistinct 
transverse swelling; dorsum of epinotum some- 
what angulate (Fig OF )oi seme sees 13. Lasius 
Clypeus longer, as in Fig. 14D, with a slight mesal 
crest or angulation for most of its length; dorsum 
of epinotum smoothly rounded (Fig. 9C) 
Le 9 Re A ae ee 14. Formica 
Subfamily PSEUDOMYRMECINAE 
20. Includes only one genus in North America (Fig. 5) 
ol ARIE Ae Nae hese eee 19. Pseudomyrmex 
Fig. 9——Diagnostic parts of worker ants of the subfam 
Formicinae. A, Polyergus, front view of head; B, Camponoti 
side view of thorax and petiole—r, ridge; C, Formica, side vir 
of thorax and petiole; D, Paratrechina, side view of thor 
and petiole; E, Paratrechina, side view of thorax and petio 
F. Lasius, side view of thorax and petiole; G, Prenolepis, si 
view of thorax and petiole. 
Subfamily MYRMECINAE 
21. Pedicel attached to dorsal surface of gaster, which 
flattened dorsally and markedly heart shap 
(Fig. 25) 0.2.0.3.) 26. Crematogas 
Pedicel attached near center of anterior end 
gaster, which is ovoid in shape (Fig. 2) 
92. Dorsum of thorax with tubercles, as in Fig. 23B 
re ya 21. Trachymym 
Dorsum of thorax without tubercles ......---+:: 
23. Front part of mesonotum with long spines project 
forward (Fig. 23A) ......5. 0. 20. A 
Front part of mesonotum without spines (Fig. 1 
D; G, H, and 1)........ 2.) 
94. Head somewhat wedge shaped in full-face v 
(Fig. 24) ............4.:05 2 
Head not wedge shaped in full-face view (Fig. 1 
and F) .......00.000 02 
95. Mandibles as long as in Fig. 24A and B 
Midp is aieat J 22. Strumige 
Mandibles shorter, as in Fig. 24C and D 
Aittvne fe tes Rg aee a 23. Smithistru 
26. Epinotum with dorsal margin smoothly roun¢ 
without spines or angulation (Fig. 1E) aie. 
Epinotum with spines (Fig. 10C, D, G, and H) 
with an angulate posterior dorsal margin (1 
