MONOGRAPH OF THE NORTH AMERICAN PROCTOTRYPID.E. 249 



3. Wings without 1>asiil atid median v»'iiis 4 



Wings with hasiil and median veins. 



Mesonotum Avith 2 iaint furrows. 



Antenna^ Hubelavato moiiiliform, first fiuiielar joint very minnte, 

 second somewhat larjjer, th(( following to 10th larger, gru<lii- 



ally thickened, the hist Lirger, conical Metaclisi.s Forster. 



Autenii submoniliform, first fnniilar Joint very minute, second 

 1 r, thickened, curved, tht* third small, triangular, the fol- 

 ic ug except the last transverse nu)niliforni, the last conical. 



MoNocRiTA Fiirster. 



4. Lateral ocelli nearer the apical ocellus than to the margin of eye. 



Mesonotum without furrows Ist>STAKHs, F<irster. 



Lateral ocelli nearer the margin of eye than to the apic-al ocellus. 



Mesonotum with faint furrows; antenuie mouiliform, puhcscent, the first 

 two fuuitJar joints nearly equal, the second somewhat curved, 

 the third small, triangular, the four following moiiiliform, 

 the last conical Inostkmma Hal. 



Mesonotum with 2 distinct furrows; antcnmu filiform, pubescent, the 

 second funiclar joint long, cylindrical, longer than the first, 

 the third shorter than the first, the following oval, the last 

 about thrice as hmg as thick Acerota Fiirster. 



IPHETRACHELUS Hali.lay. 

 Ent. Mag., in, p. 27:5 (183fi) ; Fiirster Hym. Stud., ii. p. 106 (1856). 



(Type, /. lar Hal.). 



Head transverse, the frons subcouvex, smooth; ocelli 3 in a triangle, 

 the lateral close to the margin of the eye; eyes rounded. 



Antenna; inserted just above the clypeus, in 9 10-jointed, very long, 

 the terminal joints forming a club ; scape long, subclavate, funiclar joints 

 small, moiiiliform; in 3 9-jointed, the flagellar joints nodose-pedicellate, 

 with whorls of sparse long hairs. 



Maxillary i>alpi short, 2 jointed; labial palpi 1-jointed. 



Mandibles bifid at tips. 



Thorax oval, the prothorax slightly visible from above ; mesonotum 

 wither without furrows ; scutellum gibbous, nearly round; metathorax 

 short, rounded behind. 



Front wings ciliated, the submarj^inal vein ending in a knob a little 

 before the middle of the wing. 



Abdomen long ovate, subsessile, subcouvex, and narrower than the 

 thorax, the second segment very large, occupying most of the surface, 

 the following segments all short. 



Legs slender, the femora subclavate, the tarsi 4jointed, the basal 

 joint of hind tarsi about as long as all the others together. 



The 4-jointed tarsi, and the 9-jointed, nodose-pedicellate antenna; of 

 the male readily distinguish the genus. 



