MONOGRAPH OF THE NORTH AMERICAN PROCTOTRYPID.E. 181 



3. Wiiifit'd; inau(lil)lc.s Itilid, tlio tcetli eijiial. 



Metascutellnui witli a spine, or tubt'icula.tc IIoPLtxJiiYox Ashiu., geu. iiov. 



Mctascutolluin simiile ({ryox Hali<lay. 



Apterous. 



Metascutellnui with a sutall s]iiiie or tubercle (II<)Pl<k;ryon). 



Metasciitellum without a spine, simple (Gryon). 



Abdomen broadly oval, the first segment wider than long 3 



Abdomen long-oval, the first segment ]ieti(diform; the marginal vein very long. 



Mesonotuui without furrows; postscutcllum s])iued 2 



Mesouotum with 2 distinct furrows; posterior angles of metathorax usually 

 spined or toothed. 

 Metascutellum Avith 3 spines; antenna' very long, filiform, pubescent. 



Trissacantha Ashm. 

 Metascutellum with 1 s]>ine; antennte with whorls of hair. 



Xknomekt's Walk. 



2. Antenna' long, filiform, the flagellar joints at least four times as long as thick, the 



third joint excised at base or angulated; posterior femora not 

 swollen, the tibial spurs not developeil, the basal tarsal joint long, 



slender Prosacantha Nees. 



Antenna' filiform, the flagellar joints usually less than thrice as long as thick ; 

 posterior femora swollen, the tibial spurs develoiied, the basal 

 Joint short, stout Tkleas Latreille. 



3. Marginal vein long, at least four or Ave times as long as the stigmal. 



Metascutellum with a small spine or tubercle; antenna* filiform, the flagellar 

 joints elongate HoPLor.RYoN Ashm., gen. nov. 



Metascutellum without a si)ine, simide; antennie filiform, the flagellar joints 

 scarcely longer than thick GuYON Haliday. 



PENTACANTHA Ashm. 

 Can. Ent., xx, p. 51 (1888). 

 (Type, /'. cdiiadoiNix Ashm). 



Head transverse, the occiput straiglit, iiotemarginate, with a delicate 

 margiu extending' on the cheeks, which are tlattened; ocelli o, in a tri- 

 angle; eyes long-oval, hairy. 



Antenna? inserted at the base of the clypeus, 12-jointed in both sexes, 

 in the 9 clavate, the clnb C-jointed, the first fnniclar Joint twice as long 

 as the pedicel. 



Maxillary palpi very short, 3-jointed. 



Mandibles bidentate at apex, sinuate, and with a lobe at base Mithin. 



Thorax ovoid, the prothorax not visible from above; mesonotnm 

 wider than long, the scapuhe not separated; scutellum semicircular, 

 rugose; postscutellum with 3 erect, conic teeth; metathoiax very sliort, 

 with prominent acute posterior angles that are connecte<l with a carina. 



Front wings as in Prosactmtha. 



Abdomen oblong-oval, narrowed at base, attached to metathorax far 

 above the hind coxa^, and composed of six visible dorsal segments, the 

 basal segment having a short, smooth, blunt horn, jtartly prolonged 

 over the metathorax, the third segment the longest. 



