MONOGRAPH OF THE NORTH AMERICAN PRGCTOTRYPIDiE. 69 



Anoxus musculuB Sny. 



Bethyhtx vihscuIhk Say, Host. Jour., i, 280; Lee. ]':<l. Say, ii, ]». 7i'«; Cress. Syn. 



llyiii., 1). 247. 



Black ; antenna^ and feet yellowish ; abdomen depre.ssed. 



Inhabits Indiana. 



Body somewhat polished, impunotured, black; antennai dusky, honey-yellow 

 towards the base; mandibh's honey-yellow; thorax with the anterior segment not 

 much elongated; dorsal impi-essed lines very obvious; wings hyaline; radial ner- 

 vure extended, eiiually distinctly near to the tip of the wing; discoidal cellnle none; 

 inetathorax minutely and distinctly punctured or granulated above, and minutely 

 liueated each side; abdomen dei)ressod, p<dished, piceous black, distinctly petio- 

 lated; feet houcy-yenow; thighs a little dusky in the middle; length over one- 

 twentieth of an inch. (Say.) 



Unknown to me. The lonj? radial nervurc will exclnde the species 

 from BethyhiH as now restricted, and it is placed here temporarily or 

 until it is re<liscovered and its true position ascertained. 



PBRISEMUS Ffirstcr. 



Hym. Stud., ii, p. J).->, 18.^6. 

 EphemiiK Thoms. Ofv., ISfil, p. 452 



(Type 7'. triarcolatun Fiirst.) 



Head lare,e, oblong, much wider than the thorax; eyes prominent, 

 smooth; ocelli small, but distinct. 



Anteuua3 12 jointed, subsetaceous, somewhat distant at base, sepa- 

 rated by a frontal lamina. 



Maxillary palpi 0-jointed; labial palpi 4. jointed. 



Mandibles 4- or T) dentate. 



Thorax elongate, the prothorax rounded anteriorly; mesonotum 

 short, smooth, without furrows; metathorax subquadrate, oblicpiely 

 rounded oft" i)osteriorly. 



Front wings with a subqu.adrate stigma, a parastigma (rarely want- 

 ing), an incomplete radial cell, and two basal cells, the first of which 

 is longer than the secon<l; the basal vein with a branch or spurious 

 vein directed backwards, or at least broken by a stump of a vein. 

 Apterous forms rare. 



Abdomen ovate, subsessile, the apical margins of some of the seg- 

 ments sinuate or emarginate. 



Legs short, stout, the femora much swollen, the tarsi slender, the basal 

 joint of hind tarsi t\vi(;e as long as the secoiul, claws simple. 



This genus could only be confuse*! with (foniozus, with which it 

 agrees, except in having 12-jointed auteun.'e, and in having a slightly 

 narrower head. - — -. -__ 



The species known to me may be separated by the aid of the follow- 

 ing table; 



