MONOGRArrr of tre nuktii American pkoctotkypid.e. 177 



fuscous sjxtts at biise of second sei;nu'iit, but toward tlie lattTal corners. 

 Head very wide and thick antero-i^osteriorly. Eyes large, rounded, 

 coarsely foiceted. Antemne 7-jointed,tlie club very large, inarticulated, 

 and longer than the pedicel and funicle together; first funiclar Joint 

 scarcely longer than thick, the other three exceedingly short, transverse. 

 Thorax entirely without trace of furrows. Wings entirely wanting. 

 Abdomen oval, not longer than the head and thorax together, faintly, 

 microscopically punctate and shining; the first segment with a horn- 

 like prominence, striated i>osteriorly ; the second segment is a little 

 longer than the first; the third, as long as the ttrstand second together; 

 the following segments short. 



Habitat. — Washington, J>. C 



Tyi^e in Coll. Ashmead. 



Described from .'3 specimens, taken by Mr. E. A. Schwarz and myself. 



This wingless species, but for the hornlike structure at base of ab- 

 domen, could easily be mistaken for an Acoln.s. 



BiEUS llnliilay. 



Kilt. :M;ig., I. p. 270 2. 



f{ill»rh<nifi Fi'yVHirr Hyiii. Stud., ii. p. 144, 185t). 

 Trichasiiis Trov. A<1<1. <'t Coir., ]>. 209, is87. 



Head very large, transverse, about twice as wide as the thorax, the 

 frons broiul, convex; ocelli 3, triangularly arranged l)nt widely sepa- 

 rated, the lateral being close to the margin of the eye; eyes very large, 

 oval. 



Antenna' inserted close to the clypeus; in 5 7-Jointed, clavate, the 

 clul) large, inarticulate; in S lL*-jointed, subclavate. the funiclar joints 

 after the second scarcely longer than wide, very slightly widened toward 

 tips. 



Maxillary palpi L*-.jointed. 



Thorax scarcely iis long as wide, the [»ronotum not visible from above, 

 the scutellum in 9 jiot ditterentiated, while the metathorax is extremely 

 short; in the <^ the scntc^llum is distinct, semicircular, subconvex. 



Wings in the i with a distinct basal nervure, a short marginal, a. 

 long knobbed stigmal nervure and no post marginal; the 9 always 

 apterous. 



Abdomen in 9 oval, sessile, convex above, fiat beneath, the third 

 segment occupying nearly the whole surface, the first and second seg- 

 ments being visible only as transverse lines or wrinkles; in <S smaller, 

 rounded and more flattened, the first and second segments very short, 

 transverse, the third the largest segment. 



Legs rather long, the femora clavate, the tibial spurs weak, the tarsi 

 5-jointed, the hind tarsi not longer than their femora, the basal joint 

 being one-third longer than the second. 



The absence of a scutellum readily distinguishes the females (tf this 

 genus. The male was unknown to Haliday and Forster and is here 

 21890— Ko. 45 12 



