AMERICAN HYMENOPTERA. 327 



domen ferruginous, petiole and posterior segments black ; petiole distinct ; abdo- 

 men 5 ram long; ovipositor 11.5 mm. long. Length 9.5 mm. 



Habitat. — New Jersey. 



Type in the collection of the American Entomological Society. 



AUL.ACUS Jurine. 

 1807. Aulacus Jurine, Nouv. Meth. Hym. et. Dipt., p. 89, Taf. 7. 

 1873. Aulacostethus Pbilippi, Ent. Zeitg. Stettin, Jahrg., 34, p. 302. 



Anterior margin of the prothorax rounded, without an acute 

 tooth ; medial mesothoracic lobe gibbous, with strongly carinate 

 sides; wings hyaline or stained slightly yellowish fuscous, without a 

 fuscous spot beneath the stigma. First transverse cubitus inter- 

 stitial with or close to the first recurrent nervure ; hind coxse nor- 

 mal, tarsal claws with one tooth beneath. See Plate XI, Fig. 9. 



Posterior coxae of the 9 with a medium sized tooth near the apex of the lower 



margin. Length 9 12 mm rufitarsis Cresson. 



Posterior coxae of the J with a very small tooth. Length 8 mm. 



minor Cresson. 



Aulacus rufitarsis Cresson. 

 1864. Aulacas rufitarsis Cresson, 9 > Proc. Ent. Soc. Phila., iii, p. 134. 

 1880. Aulacus editns Cres.son, 9- Proc. Ent. Soc. Acad. Nat. Sci. Phil., 1880, p. v. 

 1880. Aulacus abdominalis Cresson, 9 , Proc. Ent. Soc. Acad. Nat. Sci. Phil., p. v. 

 1883. Aulacus bilobatus Prov., % , Faun. Ent. du. Can , p. 247. 

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

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

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



9 %. — Black; vertex sparingly, face closely punctulate. Antennae black, 6- 

 10 mm. long; medial mesothoracic lobe gibbous, broadly not deeply emarginate, 

 transverse striate, lateral angles carinate; wings hyaline or stained slightly yel- 

 lowish ; legs rufous, often darker, especially tibiae, coxae and trochanters black ; 

 tarsi often flavous; abdomen ferruginous, with more or less black; ovipositor 

 10-12 mm long. Length 9 12 mm. 



Habitat. — Vancouver, Washington, Nevada, Canada, Virginia. 



The author has not been able to discover any reason for keeping 

 rufitarsis, editus, abdominalis and bilobatus separate, so he has fol- 

 lowed Dr. Schletterer's example and grouped them together as rufi- 

 tarsis. A fair series of specimens seems to indicate their unity. 



Types in the collection of the American Entomological Society. 



Aulacus miuor Cresson. 

 1880. Aulacus minor Cresson, Proc. Ent. Soc. Acad. Nat. Sci. Phil., v. 

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



9. — Black; vertex less punctured than face; antennae black, length 6 mm. ; 

 wings hyaline ; medial mesothoracic lobe gibbous, broadly not deeply emarginate, 



TRANS. AM. ENT SOC, XXVII. NOV., 1901. 



