720 THE AMERICAN NATURALIST. [ VoL. XXXVI. 
C 
C2 
Clypeus armed with two ridges, which project forward in the form of 
teeth, rarely without teeth, but then the epinotum is quite unarmed ; 
mesoépinotal suture marked * Monomorium Mayr 
Clypeus of a different Caoin. rarely 2- Paun but then the 
mesoëpinotal suture is indistinct 6 
64. Inferior angles of the pronotum pointed . . . . - Rogeria fad 
Inferior angles of the pronotum rounded . 
65. Postpetiole campanulate, attached Cision io. means of its shed 
posterior surface to the einig segment; thoracic dorsum with 
neither suture nor impression .  Macromischa Roger 
Postpetiole distinctly constricted postery : Ce hea ae 
66. The abdomen, seen from the side, is licia its anterior angle 
attached to the postpetiole; epinotal spines recurved forwards 
Trigonogaster Forel 
Of a different conformation 
. Without erect hairs, petiole dc with a a sudes DONE 
petiole usually very large . * Cardiocondyla Emery 
With erect hairs; which are sini ees and microscopically den- 
E ne es OQ Saas s ns MAE: Mayr 
Os 
€ 
The following genera are not included in this table : * Anergates Forel 
and Epæcus Emery, parasitic ants, which have no workers; Trichomyrmex 
Mayr, Tranopelta Mayr, * Oligomyrmex Mayr, Rhopalomastix Forel, Crato- 
myrmex Emery, of which the workers are unknown; and finally Pheidola- 
canthinus F. Smith, which was insufficiently characterized by its author 
and is unknown to me in nature. 
4 Subfamily: DOLICHODERIN#.! 
1. Sting well developed; petiole with a long peduncle in front 
Aneuretus any 
Sting rudimental ; AREE squamiform or nodiform, not pum d in 
tont. . p 
2. Chitinous integument stiff d britde, often KERET Puer ‘horas 
and scale often spinose or angular; gizzard without a calyx and with 
delicate cuticle, not furnished with cilia at the eaman 

Dolichoderus Lund 
Integument thin and flexible, finely sculptured; thorax and pee 
never spinose ; gizzard of a different conformation . 3 
3. Body very slender ; legs and antennæ much elongated, qune or gua 
sized species; gizzard without a Ce furnished with cilia at the 
entrance (Australia) . a . Leptomyrmex Mayr 
1 The genera of the Dolichoderinz are in large part established on anatomical 
a characters (structure of the gizzard) and the wing neuration; this renders the 

identification of isolated workers very difficult. 

