28 MUTILLIDA, 
The females of those which are solitary, and the neuters of 
the social ones, are apterous and very frequently without 
stemmata. 
Famity I. 
FORMICIDZ. Leach. 
Live in societies consisting of three kinds of individuals, 
the males and females of which have wings, which the latter 
lose after impregnation.* 
Famity II. 
MUTILLIDZ. | Leach. 
Are solitary and each species consists of but two indi- 
viduals. The females are apterous and generally differ in 
colour from the winged individuals or males. Their 
antenne are filiform or setaceous. The legs of the females 
are robust, their tibiz spinose and tarsi ciliated; and the 
males have generally one or more spines or obtuse teeth at 
the anus. 
—— 
(a) Thorax of the females continuous or almost cubital. 
Grnus I. Moutitra. Lin. 
Heap suborbiculate in the 9, transverse and compressed in the 
d ; eyes very small and round in the @, slightly emarginate 
in the g, which has the three stemmata placed in a triangle 
upon the vertex, but wanting in the ¢ ; the antenne subfiliform, 
decreasing gradually towards their apex, which is acuminate, 
inserted in a cavity on each side of the base of the clypeus, which 
is convex and emarginate in front; the mandibles arcuate, uni- 
dentate, and acuminate in the 9, and tridentate in the 2, being 
® I have considered this brief definition sufficient, as this family is not treated 
of here. 
