MONOGRAPH OF THE NOKTH AMKRICAN I'ROCTOTKYPID.E. 181 



3. Wiiif^cd; iiijui(li1>l»'s Mtitl, the ivvAh «'<|iial. 



Metiiseutelliiiii with :i spiiio, or tiiln'iriilat*' IIorLocKYox Asliin., goii. iiov. 



Metascutelliiiii simple (Jryox lialiday. 



Apterous. 



MetiistMitelliim with a small s|)iiio or tubercle (Hopmkiryon). 



Metascntelluin without a spine, simple ((JRYON). 



MALKS. 



Abdomen broadly oval, the first segment wider than long 3 



Abdomen long-oval, the first segment jietioliforni; the marginal vein very long. 



Mesonotum without furrows; ])ostscutelluiii s])iued '2 



Mesonotimi with 2 distinct furrows; posterior augh's of metathorax usually 

 spiued or toothed. 

 Metascutellum with ;J spines; antenna' very long, liliform. pubescent. 



Tkissacantha Ashm. 

 Metascntellum with l.s])iiie; antenna' with whorls of hair. 



XKNOMEItl^S Walk. 



2. Antenna' long, tiliforni. the flagellar Joints at least four times as long as thick, the 



third Joint excised at base or angulated; i>osterior femora not 

 swollen, the tibial spurs not develope<l, the basal tarsal Joint long, 



slender Prosacantma Nees. 



Antenna- filiform, the flagellar Joints usually leas than thrice as long as thick; 

 ]iosterior femora swollen, the tibial sjmrs develo])ed, the basal 

 joint short, stout Tki.kas Latreille. 



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



iletascutelliim with a small spine or tubercle; antenna' filiform, the flagellar 

 Joints elongate HoiM.ociRYoN Ashm., gen. nov. 



Metascutelliim without a sjiiiie, siniide; antenna; filiform, the flagellar Joints 

 scarcely longer than thick Grvon lialiday. 



PENTACANTHA Ashm. 

 Can. Ent., xx, ]>. .51 (1888). 

 (Type, r. ((DindvustK Ashm). 



Head transverse, the occiput straijrlit, not eniarj?inat<^, with a delicate 

 margin extending on the clieeks, whicli are tiattened; ocelli ."5, in a tri- 

 anjifle; eyes Ion j^' oval, hairy. 



Antenna' inserted at the base of the clypens, 12-jointed in both sexes, 

 in the $ clavate, the club G-Jointed, the tirst tunidar joint twice as long 

 as the pedicel. 



Maxillary palpi very short, 3-jointed. 



iSIandibles bidentate at apex, sinuate, and ^ith a lobe at base within. 



Thorax ovoid, the protliorax not visible from above; me.sonotuni 

 wider than lor. g, the seapuLe not separated; scutelluni semicircular, 

 rugose; postscutellum with 3 erect, conic teeth ; inetathorax very short, 

 with prominent acute posterioi- angles thtit are connected with a carina. 



Front wings as in Prosacdntha. 



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

 above the hind coxiv, and composed of six visible dorsal segments, the 

 basal segment having a .short, smooth, blunt horn, partly prohmged 

 over the metuthorax, the thij'd segmeni the longest. - :,^ 



