Ill. METHOCA. 35 
the lateral posterior margins of the clypeus, and of about the 
length of the head and the first node of the thorax, the scape 
very thick, the pedicle small, joints of the clavolet subequal 
and cylindrical, the basal ones with a few rigid hairs at their 
extremity; clypeus triangular, convex, its anterior margin 
rounded ; mandibles arcuate, slender and bidentate at their 
apex, furnished on the exterior with rigid sete. ¢. Heap 
transverse, flattened in front, convex behind; eyes oval, pro- 
minent and lateral; stemmata large and in a triangle on the 
vertex ; antenne filiform, decreasing towards their apex, 
longer than the thorax, the scape short and robust, the pedicle 
very minute, the third joint shorter than the fourth, which is 
the longest of all, and from which they gradually decrease, 
and all the joints from the third subarcuate ; the clypeus and 
mandibles the same as in the female. ¢.THorax composed 
of three nodes: the first and second ovate, the latter including 
a semicircular dorsolum and ovate scutellum; the third, or 
metathorax, orbiculate; legs long and slender; core very 
robust; femore subclavate; tars: longer than the tibie. 
4. Tuorax oblong; collar broad, and transverse, extending 
at the sides to the origin of the wings: scutellum triangular ; 
metathorax obtuse ; the superior wings nith one long narrow 
pointed marginal cell extending nearly to its apex, and three sub- 
marginal cells, the first nearly as long as the two folloning, 
narrow and receiwing at about three-fourths of its length the first 
recurrent nervure,—the second quadrangular, larger than the 
third and recewing near its centre the second recurrent nervure,— 
the third extending to the apex of the wing; the legs mode- 
rately long, very slender; the tarsz the same as in the female. 
g. ABDomMEN ovato-conical, attached by a short petiole to 
the thorax, the first segment much narrower than the second, 
the sting long and slender, and when exserted much curved 
downwards.— ¢. ABpomeEN linear, the segments subcrenate, the 
hypopygium produced laterally into two vertical plates acute 
at their extremity, and below into a central long upcurved 
Diz 
