MONOGRAPH OF THK NOHTII AMERICAN PKOCToTUYPIDiE. 277 

 IsorhombuB arizoneiisis. sp. imv. 



5. Lenjjtli, -""". Black, highly polished; i>avapsi(lal furrows ob- 

 Roletci anteriorly. Head very wide, not very thick a ntero posteriorly, 

 the lateral ocelli I'ar away from the margin of the eye. Mandibles 

 j>iceous. Antenna! lOjointed, rnfo-j)iceon8, the Hagellnm twice the 

 length of tlio scape; pedicel a little longer than thick; Joint 1 of funi- 

 cle very minnte, closely Joined to the secojid, sec<Hi<l about twice the 

 length of third; club 5 Jointed, cylindric, the Joints, except the last, 

 nearly equal, longer than thick, the last cone-shaped, a little longer 

 than the penultimate. Scntellum conit-ally ehnate<l posteriorly, de- 

 pressed at base, sparsely pubescent aiul with a small acute spine at 

 tip. MetiJthorax, hind coxa? and petiole, pubescent. Legs brownish- 

 yellow, the coxa^ black. Teguhe black. Wings hyaline, ])ube8cent, 

 extending, when folded, scarcely beyond the tip of the abd(unen. A.b- 

 domen long oval, pidished, alxmt as long as the head and thorax 

 together, the basal Joint very little longer than wide, densely pubes- 

 cent, the margin very wide. 



HahitAT. — Fort Huachuca, Ariz. 



Type in National Museum. 



Described from a single specimen, reared May S, 1S83, from a Cecido- 

 myiid gall ou an unknown plant, sent to the Department by Mr. H. K. 

 Morrison. 



POLYMBCUS Forntor. 



Hym. Stud., ii, p. 144 (18.t6). 

 Ectadiutt Fiirster, loc. oit., p. 108. 

 Epimeces Westwood (pars). 



(Type 1*. craternH Walk.) 



Head transverse, the occiput delicately margined ; ocelli 3, in a curved 

 line, the lateral ocelli only their width from the eye margin. 



Antenna' lO-Jointed in both sexes, the scape long, subclavate; in 

 the 9 the club is 4 or 5 Jointed, when 4 Jointed the last funicle Joint is 

 shorter than the preceding, when 5-Jointed the last two funiclar Joints 

 about equal or the last the longer; in $ with a O-Jointed, bearded club, 

 the second funiclar Joint being somewhat swollen and curved or twisted, 

 the first being small. 



Thorax ovate, the i)rothorax distinct from above, the mesouotum 

 much longer than wide (nearly twice as long as wide), usually with 2 

 distinct furrows; scntellum convex, often, but not always, with a tuber- 

 cle or spine at tip, the basal i)art of the middle lobe of mesonotum pro- 

 jecting slightly upon it at base; inetathorax short, with 2 carintedown 

 the center, the metapleura densely jjubesceut. 



Front wings pubescent, veinless, rarely with the subinarginal nerv- 

 ure visible, when present not knobbed at tip; in 9 the wings, when 

 folded, do not extend to the apex of the long abdomen. 



