132 FAMILY EVANIID^. 



slopes off more or less abruptly into the posterior face or truncature. 

 which may be flat, convex or concave, with a niesal angle. The 

 propodeum is almost always reticulate, except above the petiole, 

 where it may be punctured or rugose. In the genus Hyptia the 

 shape of the reticulations on the sides just behind and perhaps 

 extending over the metapleura? is of prime specific importance 

 (Pi. V). 



The abdomen in the female Evaniini is about the shape of an 

 isosceles triangle, base uppermost, and the outer angle with the 

 pygidium produced into a point from which the ovipositor may be 

 exserted (Fig. 18). In the male it is narrowly oval. Always in 

 Hyptia and usually in all Hyptiini the abdomen of the male and 

 female are alike, round and without any visible sign of ovipositor ; 

 often it is impossible to distinguish the sexes. In both tribes the 

 petiole is long, flattened below, and often striate or punctured, espe- 

 cially on the sides ; it is not enlarged apically and is distinctly sep- 

 arated from the rest of the abdomen. The abdomen proper is 

 highly chitinized ; in every species I have seen, smooth, black and 

 polished ; it is very strongly compressed ; the ventral segments only 

 narrowly exposed ; these also chitinized and forming a sharp mesal 

 keel at the lower edge of the abdomen. The ovipositor is never 

 exserted. 



The posterior coxse are grooved above for the reception of the 

 femora. In all genera except Hyptia, and probably Evaniellus, 

 the posterior legs are very elongate (Fig. 60) ; in the former genus 

 they are only the length of the body, and the posterior tibi?e are 

 distinctly thickened at theii' apex (Fig. 61). In two genera the 

 [Misterior legs bear numerous sti'ong spines in rows; also in Hyptia 

 there are rows of very minute spines, visible only with favorable 

 light and under a strong lens, or more distinct in one species. The 

 posterior tibise are armed with two long spurs, and the propoi'tion of 

 tlie longer of these to the metatarsus (first tarsal joint) is of specific 

 importance. Tlie proportion of the metatarsus to tlie following 

 joints is also important, but is nearly fixed in Jfyptl((. In all genei'a 

 thei-e is a distinct tooth within the tarsal claw (Figs. 44-54), and 

 the shape and position of this and its angle with the outer ray is of 

 specific value in some genera, but nearly constant in Hyptia. Some- 

 times as in Zeuxevania. (Fig. 50) and Sema'omyia, (Fig. 51 ) the claw 

 is l)ifi(l, and the inner ray much stouter and longer than the outer. 



