
N 
vi 
S 
9 
N 
N 
oo 
Y 
bs 
Ww 
o 
w 
— 
Ww 
N 
- 429.) THE FAMILY OF FORMICIDA. 717 
v ADtent T630IBfed . «convi cpu coe wrote RE 
Antenne II-jointed . (58 
. Dimorphism of the al ae ordi iik slightly Widi or, in the 
opposite case, the head of the worker major is subquadrate or broader 
than long (antennæ 1o- to t 1-jointed in the female) 
* Solenopsis Westwood 
Dimorphism of the workers very marked; head of the worker major 
elongated (antennz 11-jointed in the female) . Aéromyrma Forel 
Thoracic sutures indistinct. . imo od ooo M POM tip 
Mesoépinotal suture strongly stn ind 
. Ninth antennal joint conspicuously indir tiam m eighth, ed 
much shorter and especially narrower than the tenth 
Diplomorium Mayr 
Ninth joint of the antennae not distinctly longer than the eighth; 
workers polymorphic ; soldiers with enormous heads 
Pheidologeton F. Smith 
. Antennal fovee deep, capable of containing the whole scape, and 
placed along the sides of the head . . - 29 
Antennal fovez less deep or differently ud FOE 30 
Antenne 9-jointed (ro-jointed in the male as in E 1 à meso- 
notum with a blade-like posterior edge and usually armed with spines 
Meranoplus F. Smith 
Antenne 1 I-jointed, the last joint very E Calyptomyrmex Eme 
. Erect hairs on the body trifid . . . * Tri R Forel 
Hairs not trifid . 
31 
. Posterior border of the dope teed t in the Kis of a eit ridge 
which borders the antennal foveæ in front. . . . . . . . 32 
Posterior border of the clypeus not forming a ridge 
38 
- Mandibles pointed, without apical border. * Strongylognathus M ayr 
Mandibles with dentate apical border . 
33. Portion of the clypeus in front of the goed insertion narrow, but 
not reduced to a mere ridge (antennz of the male ro-jointed) (form- 
ing with the four preceding genera the tribe Tetramorii) . 4 
Portion of the clypeus in front of the antennal insertion reduced. toa 
trenchant ridge “ea of male b pos ue i rw 
34. Antenne 12-jointed . cu | 4 y v uc. 2 X 
Antenne 11-jointed . m m ences 788 
35. Epinotum armed with spines or + Gah . . . . *Tetramorium Mayr 
Epinotum rounded, unarmed .  Rhophomyrmex Mayr 
36. Thoracic dorsum deeply coi a at the inesoéptootal suture 
Dacryon Forel 
Thoracic dorsum scarcely or not at all ipu at the mesoépinotal 
suture . Rhe uis EE . Xiphomyrmex Forel 
37. Antenne era ees nw 2. . Pristomyrmex Mayr 
Antena jomed .. . . : Pe ce . 38 
