1894. PROCEEDINGS OF THE NATIONAL MUSEUM. 607 



Peruaiide, in tlie District of Columbia, iu July and August, 1878, one 

 taken by myself in September, 1^'^^^ and one ca])tured by Mr. J. M. 

 Aldricli, in South Dakota. All in the U. S. National Museum collection. 

 I have also seen two females in the collection of the American Entom- 

 ological Society at Philadelphia. 



Genus BOTHRIOTHORAX, Ratzeburg. 



liothriothorax, Ratzeburg, Ichnenmonen d. Forst-in.-iekten, i, 1844, p. 208. — 



FoERSTKR, HymeuopterologischeStufiien ii, 1856, p. 32. — Suellen vax Vol- 



LENHOVEX, Schetseii, 1871, Tab. vii. — Thomsox, Hymenoptera Scandiuavife, 



IV (187o), p. 133.— Mayk, Die Eiiropaische Eucyrtideii, 1875, p. 80 (754). 



Female. — The body is rather broad and flattened. The antennre arise 



not far from the border of the mouth; the scape is quite long and not 



flattened; the pedicel is as long as or longer than the first funicle Joint; 



this last is as long as or longer than thick; the club is shorter than the 



funicle or (with B. paradoxus) twice as long. The face is delicately 



impressed ; vertex and clypeus are very broad, and the ocelli form a very 



obtuse-angled triangle. The thin (antero-posteriorly) broad (laterally) 



head is very deeply punctured, as are also mesonotum and scutellum; 



in the center of each puncture is a little papilla, from which springs 



a delicate hair; besides this, there is a leather-like sculpture. The 



inesoscutum and scutellum are rather strongly transversely arched, and 



the lateral borders of the latter are quite sharp. The ovipositor is not 



at all, or very slightly, extruded. The marginal vein of the hyaline 



wings is very short, or is lacking; the stigmal is long, and the 



postmarginal is short, or very short; radial angle wide. 



Male. — Very similar to the female and only distinguished by the 

 antenme and by the sparser punctuation of the head. The pedicel is 

 short, somewhat longer than thick; the funicle quite lengthened, and 

 the joints small and strongly concave beneath, so that the funicle appears 

 somewhat toothed above; most of the joints have two half whorls of 

 long hair; the club is almost as long as the last two funicle joints 

 together. 



AXALV8IS OF THE SPECIES OF BOTHRIOTHORAX. 



Punctures of mesonotum deep but very irregular, giving a strongly rugose appear- 



flUCe VIRGINIEXSIS. 



Punctures of scutum quite round and regular. 



Axilla- meet at tips peculiaris. 



Axilhe separated at tips : 



Sciitellum more or less emarginate at tip. 

 Scutellum nearly uniformly punctured. 



Emargination of tip of scutellum faint; auteuute rather long and 



slender noveboracensis. 



Emargination very distinct; autennaj short and stout, califorxicus. 

 Normal punctation of scutellum ceases on posterior third, and is re- 

 placed by delicate longitudinal aciculation; emargination of tip 



slight XIGKIPES. 



Scutellum not emarginate at tip. 



Notum transversely and longitudinally convex; Aertex rounding up 



between the eyes roti'xdiformis. 



Notum nearly flat ; vertex flat : I'Laxiformis. 



