472 PROCEEDINOfi OF THE NATIONAL MV8EVM. vol. 41. 



Family CRABRONID^. 

 Genus STENOCRABRO Ashmead. 



STENOCRABRO PLESIUS, new species. 



Readily separated from the other males placed in Stenocrahro by the 

 cylindrical anterior tarsi. In Fox's table to North American 

 Crabroninae it runs to ater, to which it has no close relationship. 

 If the apical segment is more distinctly punctured than the preceeding 

 it goes to minimus, but is larger and has different colored legs than 

 that species. May easily be recognized by the entirely black four 

 posterior legs and long white hair on the anterior femora beneath 

 and mesosternum. 



Male. — Length, 6 mm. Clypeus with a strong median carina, the 

 apical middle tridentate, the middle tooth broad and rounded; 

 impressed line from the anterior ocellus only indicated; postocellar line 

 slightly longer than the ocellocular; a shallow, shining depressed 

 area outside of each lateral ocellus; head with distinct, separate, 

 fine punctures; third antennal joint distinctly longer than fourth, 

 the following joints somewhat rounded beneath; pronotum neither 

 carinated nor dentate, sharply defined, elevated; mesonotum punc- 

 tured like the head; mesoscuto-scuteUar suture foveolate ; mesoepister- 

 num punctured like the notum, the suture strongly foveolate; pro- 

 podeum with the convexities finely striate, dull ; posterior and lateral 

 faces finely striate; the median furrow and basal area foveolate; 

 anterior femora very stout basaUy; apical segment somewhat more 

 coarsely punctured than the preceding one. Black; mandibles 

 piceous; spot on mandibles, palpi, calcaria and anterior femora 

 and tibiae beneath yeUo wish- white ; wings hyaline, iridescent, venation 

 black; abdomen with white pile. 



New Haven, Connecticut. One male collected April 17, 1910, by 

 Mr. A. B. Champlain. 



Type.—Csit. No. 14074, U.S.N.M. 



Family TRYPOXYLONID^. 



Genus TRYPOXYLON Latrielle. 



Group POLITUM. 



Group characteristics. — Large (17 to 25 mm.); black except for the 

 white, at least in the greater part, liind tarsi; wings very dark, with 

 a purplish or bronzy reflection; eyes but little if any narrower at 

 the clypeus; third antennal joint much longer than fourth, the male 

 has the apical joint subequal in length with the four preceding, and 

 the flagellum thickened apically (see fig. 11); ocelli in an equilateral 

 triangle; clypeus much produced in the female, produced and variously 



