MONOGRAPH OF THE NORTH AMERICAN PROCTOTRYPID^. 69 



Anoxus niusciilus >S.iy. 



licfhylus musctihts Say, Bost. Jour., i, 280; Lee. Ed. .Say, ii, p. T2C>; Cress. Syu. 



llyni., p. 247. 



Black; antenna? and feet yellowish; abdomen depressed. 



Inhabits Indiana. 



Body somewhat polished, impunctnred, black; antenute dusky, honey-yellow 

 towards the base; mandibles honey-yellow; thorax with the anterior segment not 

 much elongated; dorsal impressed lines very obvious; wiugs hyaline; radial ner- 

 vure extended, equally distinctly near to the tip of the wing; discoidal cellule none; 

 metathorax minutely and distinctly punctured or granulated above, and minutely 

 lineated each side; abdomen depressed, polished, piceous black, distinctly petio- 

 lated; feet honey-yellow; thighs a little dusky in the middle; length over one- 

 twentieth of an inch. (Say.) 



Unknown to me. The lon.o- radial nervnro will exclude the species 

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

 until it is rediscovered and its true x^osition ascertained. 



PERISEMUS Forster. 



Hym. Stud., ii, p. 95, 1850. 

 Episemiis Thorns. Ofv., 1S61, p. 452. 



(Type r. triarcolaius Forst.) 



Head large, oblong, much wider than the thorax; eyes prominent, 

 smooth ; ocelli small, but distinct. 



AntenutE 12-iointed, subsetaceous, somewhat distant at base, sepa- 

 rated by a frontal lamina. 



Maxillary palpi 6-jointed; labial palpi 4 jointed. 



Mandibles 4- or 5-dentate. 



Thorax elongate, the prothorax rounded anteriorly; mesonotum 

 short, smooth, without furrows; metathorax subquadrate, obliquely 

 rounded off posteriorly. 



Front wings with a subquadrate stigma, a parastigma (rarely want- 

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

 is longer than the second; the basal vein witli 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 mucli swollen, the tarsi slender, the basal 

 joint of hind tarsi twice as long as the second, claws simple. 



This genus could only be confused with Goniozus, with which it 

 agrees, except in having 12-jointed antennre, and in having a slightly 

 narrower head. 



The species known to me may be separated by the ai<l of the follow- 

 ing table: 



