TKIBE HETEROGYNA. 

 Family FOKMICID.E. 



Subfamily DORYLIN^E. 



The species contained in this subfamily are remarkable for the 

 great difference between the worker ( ) and the male ( <S ), and 

 also between the male ( <S ) and female ( $ ) so far as the last is 

 known. The c? is a large wasp-like insect possessed of well- 

 developed large eyes and ocelli : the of the two genera found 

 within our limits is blind, and in an American genus has no 

 facetted eyes but merely a single ocellus 011 each side of the 

 head. The $ is apterous and blind, with an immensely developed 

 massive abdomen a little resembling a $ termite. 



The in the Indian species possesses a sting ; the head may 

 be rectangular or oval ; the pedicel consists of one or two joints ; 

 the pupae are enclosed in a cocoon. 



Key to the Genera. 



5 $. 



a. Pedicel one-pointed DORYLTJS, p. 1. 



b. Pedicel two-jointed ^LNICTUS, p. 6. 



6 6. 



a. Of comparatively large size, length over 18 mm. ; 



node of pedicel convex , . . . DORYLTJS, p. 1. 



b. Smaller, length under 13 mm. ; node of pedicel 



concave, sometimes merely longitudinally grooved 



or bilobed, never convex ^ENICTUS, p. 6. 



Genus DORYLUS. 



Dorylus, Fabr. Ent. Syst. ii (1793), p. 365, rf . 

 Typhlopone, Westw. Introd. Claarif. Ins. ii (1840), p. 219, $ . 

 Dichthadia, Gent. Stett. ent. Zeit. xxiv (1863), p. 93, $ ? 

 Alaopone, Emery, Ann. Mm. Civ. Gen. xvi (1881), p. 274, . 



Type, D. helvolus 3 , Linn., from Africa. 



Ratige. Africa and Asia. 



The <3 , $ , and of this genus differ very considerably in 

 appearance, and were for a long time classed in different genera. 

 The <5 is a long, narrow-bodied, wasp-like insect, with very large 

 and prominent eyes and ocelli ; the mandibles are comparatively 

 long, more or less flattened and curved inwards ; the thorax is 

 gibbous and raised above the plane of the head ; posteriorly the 

 median segment has always a more or less steep slope to the apex ; 

 the femora are always compressed. The pedicel is one-jointed, 

 and either cup-shaped, rectangular, or square, invariably convex 

 above and carinate beneath. 



VOL. II. B 



