No. 429.] THE FAMILY OF FORMICIDA. 719 
Workers not dimorphic . 54 
. Petiole scarcely pedine in irt biipdüde acad below with a 
spine,’ integument in great part smooth and shining 
* Formicoxenus Mayr 
Petiole with a short peduncle, postpetiole unarmed below; body in 
great part opaque . . . . *Leptothorax Mayr 
. Workers dimorphic, -— wibo PENE intermediate between the 
large-headed soldiers and the workers; antennal club 3-jointed, 
longer than the remainder of the funicle Gpjdiatedi in PA. granulata 
Pergande) ; sting very feeble . . Pheidole Westwood 
Workers monomorphic or T 3 in the latter case the extreme 
forms are connected by intermediates, and the antennal club is 
usually indistinct or shorter than the remainder of the funiculus 56 
un 
+ 
ua 
vi 
36. Petiole armed with spines above? o uone S nos eoe e lu. 57 
Pellole without-a spine a 5... no e accepere o ee EB 
57. Petiole with one spine- . . . . . . . . . Lordomyrma Emery 
Petiole with two spines . . . Atopomyrmex André 
58. The last three joints of the antenne are are shorter than the 
remainder of the funiculus and do not form a very distinct club — 59 
The last three joints of the antenne form nosse a club about as 
long as the rest of the funiculus . 6 
Thoracic dorsum impressed at the e mesoëpinotal suture ; promesonoral 
suture usually distinct a o 
Thoracic dorsum without any trace of lohan: orimpression. . . 62 
60. Posterior spurs pectinated . . . . . S . o "NETNA 
Posterior spurs simple or absent . 61 
61. Middle of clypeus projecting in an kies epibohun unnið, with a 
median impression which can receive the petiole; integument in 
Ww 
= 
great part shining (America) . : . Megalomyrmex Forel 
Middle of clypeus angular in droit; pinoia armed with spines ; 
antennæ thick (Madagascar). . . . Eutetramorium Emery 
ypeus of a different A T bios usually armed with 
teeth or spines (always without spines in — 
namma Westwood 
* Holcomyrmex Mayr ? 
62. Posterior spurs simple ; petiole very long ene Ocymyrmex Emery 
Posterior spurs pectinated (America) . Pogonomyrmex Mayr 
1In Z. corsicus Emery, the Perte of which is unknown, the postpetiole of the 
female has only an obtuse too 
? In Atopomyrmex cranes d nodifer the node of the petiole is merely 
angular in front. 
* All the characters of the genus Holcomyrmex are found singly in one or the 
other forms of the genus Stenamma as I have defined this genus in my work on 
the ants of North America (Zool. Jahrb. Syst., Bd. viii, p. 297). The teeth of the 
clypeus are indistinct in Æ. muticus Emery. 
