154 Ml*. R. MacLachlan's Monograph of 



Abdomen slender in the male, robust in the female ; 

 in the male the terminal ventral segments are longitudi- 

 nally cleft to admit of the insertion of the penis, which 

 is generally broad and flattened ; the lateral margins of 

 these segments are generally thickened, and furnished 

 with crotchets ; the female is furnished with a very long 

 and flexile ovipositor, composed of two transversely 

 striated divisions, and ending in two small papillee. 



Legs moderately short, the tarsi with the first joint 

 long, the third cordate and nearly concealing the 

 fourth. 



Wings nearly equal, hyaline ; the neuration very 

 similar in both pairs, open ; costal area dilated in the 

 middle ; costal veinlets simple ; suhcosta joming the costa 

 far before the apex ; radius running parallel with the 

 sub-costa, but carried to the apex, and there ending 

 usually in one or more furcations ; sub-costal area with 

 one transverse veinlet placed before the middle ; ptero- 

 stigma more or less coloured, circumscribed by a veinlet 

 on each side, and traversed by one or more oblique vein- 

 lets within ; * sectors, generally two, which soon divide, 

 and the branches are twice, thrice, or four times forked 

 on the margins, the principal branches are connected 

 by two rows of transverse veinlets, and thus form more 

 or less elongate cellules beneath the pterostigma ; the 

 cidntus anticus starts from towards the base of the radius, 

 and furcates almost immediately, the two branches being 

 connected by two transverse veinlets, and thus forming 

 three large cellules, both branches emitting forks to the 

 dorsal margin, which are there again forked, like the 

 branches of the sectors. The anal space of the wings is 

 very small, and scarcely evident. 



In repose the insect elevates its prothorax and deflexes 

 its head. 



Larva with an elongated subquadrate head, and with 

 the prothorax nearly similar in form ; the meso- and 

 meta-thorax small, and much narrower ; the abdomen 

 long and dilated, gradually attenuated at each end ; fur- 

 nished with short 3-jointed antennae, and strong toothed 

 mandibles ; the legs are short, with simple tarsi. Pupa 

 in form more resembling the imago, and with the indi- 

 cations of sex strongly apparent. The larva lives 

 beneath the bark of trees, and subsists upon larvae and 

 other creatures frequenting such situations. The pupa 

 * In Inocellia the pterostigma is without au interual veinlet. 



