324 J. CHESTER BRADLEY. 



Pri$«taiilaciis parifif'iiM Cresson. 

 1879. Aulams pacificua Cresson, ? , Trans. Am. Eut. Soc, vii, p. 2.'S6 

 1901. Pristaiilacus pacificm Ashniead, Ent. News, xii, p. 278. 



9. — Black; vertex smooth, face roughened; antennae black, 12 mm. long; 

 medial mesothoracic lobe but slightly gibbous, scarcely emarginate, and the 

 transverse strife almost obliterated; wings without violaceous reflection; a fus- 

 cous spot beneath the stigma extending to the marginal nervure; the median 

 cell hyaline, but a slight fuscous spot along the transverse medial nervure; legs 

 ferruginous, hiud legs darker; abdomen ferruginous, short and robust; ovipositor 

 15-18 ram. long. Length 12-14 mm. 



'J, .—Differs only in having the fuscous spots on the wings almost obliterated, 

 and the abdonieu banded with black. Length 12 13 mm. 



Ha bitat. — Vancouver, Wash i ngton . 



This species also varies from black to ferruginous. The male is 

 here described from two specimens from Washington. 



Types in the collection of the American Entomological Society. 



Pristaiilacus fasciatus Say. 

 1829. Aulacus fasciatus Say, Coutr. Maclurian Lye. to Arts and Sci. Phila., vol. 



i, p. 67. 

 1901. Pristaulacus fasciatus Ashmead, Ent. News, xii, p. 278. 



J. — Entirely black; everywhere covered with black pubescence; vertex 

 smooth; an tennse black; medial mesothoracic lobe not gibbous, slightly emargi- 

 nate, transverse rugose ; wings entirely violaceous, except for a yellow hyaline 

 band extending beneath the stigma; legs entirely piceous; abdomen short, robust, 

 almost without petiole; ovipositor 6.5 mm. long. Length 14 mm. 



Habitat. — New Jersey, Pennsylvania, Ohio. 



The author has seen but one specimen of this strikingly beautiful 

 species, collected by Mr. Henry W. AVenzel at Da Costa, New Jer- 

 sey, July 19. 



OL.EISOPKISTEK nov. gen. 



The anterior margin of the prothorax rounded, without an acute 

 tooth; medial mesothoracic lobe not gibbous; wings hyaline or 

 stained slightly yellowish fuscous ; first transverse cubitus interstitial 

 with or close to the first recurrent nervure ; hind coxae normal ; tar- 

 sal claws with three teeth beneath, the third very small and often 

 scarcely [)erceptible with a hand glass. See Plate XI, Fig. 8. 



Type (Aulacus) firvms. 



Kierter separated his Pristaulacus from Aulacus by its having 

 three or more teeth on the tarsal claws, whereas Aulacus has but one. 

 But at least of our American species, those having three teeth form 

 a group as equally distinct from those having four, as do those 

 havino; but one. Therefore, the logical conclusion is to establish a 



