No. 2312. j^Ew NORTH AMERICAN UYMENOPTERA—ROHWER. 223 



EXOCHUS (TRICUSTUS) EVETRIAE, new species. 



Structurally this species is very close to annulicrus Walsh but is 

 readily separated from that species by the black coxae. In Davis' 

 review of the Tryphoninae this species goes to congener Holmgren but 

 is very easily distinguished from that species by the emarginate 

 occiput. 



Female. — Length, 6 mm. Face sliining with distinct, large, sepa- 

 rated punctures; front and vertex of orbits impunctato; inner margins 

 of eyes nearly parallel; first joint of the flageilum a little shorter than 

 the two foUomng in length; occiput emarginate; mesoscutum and 

 scutellum shining, with sparse setigerous punctures; propodeum 

 shining, with a few setigerous punctures; costulae wanting; the paired 

 longitudinal carinae diverging at the basal third indicating an areola; 

 areolot wantmg; nervulus postf ureal by a little more than half its 

 length; abdomen shining, with distinct widely separated punctures 

 which are closer to the middle. Black; tegulae brovvTiish; legs below 

 the trochanters, except the dusky posterior tibiae apically and their 

 tarsi, rufo-ferruginous; wings hyaline, venation pale brown, stigma 

 dark brown. 



Tiji)e locality. — Butte Falls, Oregon. ParatyiJe locality: — Grant 

 Pass, Oregon. Described from two females recorded under Bureau 

 of Entomology Nos. Hopk. U. S. 12530(^ (type) and 12556ca, material 

 collected by J. M. Miller and P. D. Sargent, and reared as a parasite 

 of the pupae of Evetria taxifolieUa (paratype) and Evetria sisJciyouana 

 (type) at the laboratory at Ashland, Oregon. 



Type.— C&t. No. 20785, U.S.N.M. 



MESOLEIUS ARTICULARIS Davis. 



The foUomng notes made from the type by R. A. Cushman may be 

 useful in assisting in the identification of this species: 



Length, 6 mm. Posterior orbits straight; malar space subequal 

 with the width of the mandible at the base; eyes much shorter than 

 the width of the face and with their inner margins parallel; only the 

 clypeus and mandibles yellow; first tergite two thirds as wide as long; 

 all of the coxae nearly entnely black; liind tibiae j^ellow, reddish at 

 apex; hind tarsi reddish. 



MESOLEIUS GYMNONYCHI, new species. 



This species according to Davis' classification is more closely allied 

 to articularis Davis than to any other species, but the type of the new 

 species has been compared with the type of Davis' species by Mr. 

 Cushman and the following essential differences are noted: Smaller; 

 posterior orbits rounded; malar space one-half the width of the man- 

 dible; length of the eyes equal to the width of the face, their inner 



