300 MEMOLRS OF THE CARNEGIE MUSEUM 



Head seen from in front not longer than wide ; frons broad ; antennje not long, inserted on a line with 

 the base of the eyes, flagellum subclavate, the fuuicle joints, or at least joints 3-6, wider than long ; 

 scutellum large, longer than the mesonotum ; front wings with a substigmal cloud ; postmarginal 

 and stigmal veins long, the latter nearly parallel with the costal margin ; abdomen shorter than the 

 thorax, compressed Chestomorpha Ashmead (type C. biformis Ashmead). 



16. Head always distinctly lenticular, the scrobes short, the punctures frequently large, thimble-like ; hind 



wings with the costal cell usually extending to the booklets 17 



Head not or less distinctly lenticular, smooth, shagreened, or finely closely punctate, rarely with a 

 few large punctures scattered over the surface ; if with large, coarse, thimble-like punctures, the 

 antennae are inserted on the middle of the face 25 



17. Marginal vein short or punctiform, not or scarcely longer than thick ; mesonotum punctate 18 



Marginal^vein at least twice as long as thick, but usually much longer; mesonotum smooth, impunctate 



or finely rugulose 23 



18. Mesonotum with the punctuation similar to that of the head 19 



Mesonotum with the punctuation unlike that of the head, the punctures less dense and the surface 



coriaceous 21 



19 Scape normal, not dilated beneath, never with a leaf-like expansion, at the most clavate 20 



Scape strongly dilated beneath, or with a leaf-like expansion, the club much enlarged ; as long as or 

 longer than the funicle ^nasius Walker (type ^. hyettus Walk.). 



20. Punctures on the head and thorax coarse and dense. 



Mesonotum very short, only half the length of the scutellum ; club of antennae as long as all the 



funicle joints united ; postmarginal vein as long as the stigmal vein Chalcaspis Howard 



(type C. pergandei How.). 

 Mesonotum at least as long as the scutellum ; club of antennae shorter than the funicle ; post- 

 marginal vein much shorter than the stigmal Bothriothorax Eatzeburg 



(type Encyrtus clavicornis Dalm.). 



Punctures on the head and the thorax smaller and less dense ; mesonotum a little longer than the 



scutellum ; funicle joints longer than thick Aratus Howard (type A. scutellatus How.). 



21. Vertex very narrow or at least not very broad, and sparsely or very feebly punctate, never closely 



punctate 22 



Vertex very broad, with a distinct thimble-like punctuation. 



Club of the antennse shorter than the funicle ; postmarginal and stigmal veins short, subequal. 



Pentelicus Howard (type P. aldricMi How.). 

 Club of the antennae very large, longer than the funicle and the pedicel united ; postmarginal 



and the stigmal veins very long, the latter the shorter... Blepyrus Howard 



(type B. mexicanus How.). 



22. Vertex not very narrow, very sparsely and feebly punctate ; eyes not especially large, nor nearly 



occupying the whole sides of the head ; scrobes rather deep ; scape slightly dilated beneath 

 towards apex, the flagellum subclavate, ringed with white, the club scarcely thicker than the funi- 

 cle ; ocelli in an obtuse triangle, the lateral farther apart than to the front ocellus ; wings hyaline, 

 subfuliginous toward base, the marginal vein punctiform, the stigmal vein longer than the short 



postmarginal and the marginal united Hemsenasius Ashmead (type H. confiisus Ashm.). 



Vertex and face very narrow, feebly punctate ; eyes very large, occupying nearly the whole sides of 

 the head and almost meeting on the vertex ; front ocellus placed far in advance of the lateral ocelli, 

 the latter close upon the eye margin ; flagellum short, clavate, the pedicel large, obconic ; first joint 



