4« 



Cincinnati Society of Natural History. 



flagellum black. Head subglobose, the eyes whitish ; antennae 

 12-joiiited, longer than the body, very gradually thickened 

 toward apex, the flagellar joints long, cylindrical, sparsely 

 pubescent. Thorax subovoid, the mesonotum wider than 

 long, the disk somewhat flat, without furrows; metanotum 

 yellowish toward apex, the surface smooth, delicately but 

 distinctly areolated ; wings hyaline fringed, the stigma and 

 nervures brown ; the cubitus arises from the basal nervure 

 at about two-thirds its length, the discoidal cell therefore 

 petiolated ; first abscissa of radius not quite as long as 

 the first transverse cubital; marginal cell large, but open. 

 Abdomen oval, the first and second segments longitudinally 

 aciculated, the rest smooth, shining; segments one, two and 

 three occupy most of the surface, the second being the 

 largest, the others, after the third, exceedingly short, some- 

 what retracted. 



Hab. — Lafayette, Indiana. 



Bred by. Prof. F. M. Webster, from wheat stubble infested 

 by the Hessian fly. 



In the paucity of antennal joints this species differs from 

 all other described forms, and this difference, in connection 

 with the peculiarities noticed in the abdomen, render it easy 

 of recognition. 



Sub-family Macrocentriisle. 

 Amicoplus Forster. 



(6) Amicoplus crambi, sp. n. Male — Length, 3.2 mm. 

 Brownish-yellow ; head black ; mandibles and palpi pale or 

 yellowish-white ; legs paler than body. 



Head transverse, the frons, above insertion of antennae, 

 impressed; face subconvex with a deep fovea between 

 antennae ; mandibles conically pointed, feebly bidentate at 

 apex ; antennae very long and slender, much longer than the 

 body, multiarticulate, about 38-jointed, pubescent. 



Thorax very distinctly trilobed, the middle lobe not attain- 

 ing to the base of the scutellum, the lateral lobes with a longi- 

 tudinal impression ; metathorax longer than wide at base, 

 with delicate lateral carinae separating the metapleura from 



