HYMENOPTERA. 307 



margins of the metathorax touching the coxae, silvery pubes- 

 cent ; the wings hyaline and iridescent, the nervures black ; the 

 mesothorax and scutellum subopake, very closely punctured ; the 

 metathorax finely shagreened, and having behind a longitudinal 

 furrow terminating at the verge of the truncation in a shallow 

 shining fovea ; the tibife and base of the tarsi covered with a 

 glittering bright silvery pubescence. Abdomen black, with a 

 violet iridescence ; the apical margins of the four basal segments 

 have bands of silvery pubescence ; the apical segment with the 

 margins carinated, above clothed with fusco-feiTuginous pubes- 

 cence. 



Hab. St. Vincents. (Coll. F. Smith.) 



44. Tachytes distinctus. B.M. 



Female. Length 9 lines. — Black: the face densely clothed 

 with bright golden pubescence; the mandibles rufo-piceous, 

 palest at their base. The thorax thinly covered with long pale 

 yellow pubescence ; the posterior margin of the prothorax, the 

 lateral and posterior margins of the mesothorax, the tubercles 

 and sides of the metathorax densely covered with golden pubes- 

 cence ; the wings yellow-hyaUne, the apical margins slightly fus- 

 cous, the nervures ferruginous ; the tibiae, tarsi, and tips o'f the 

 femora, pale ferruginous. Abdomen : the apical margins of the 

 three basal segments with bands of silvery pubescence. 



Var. /3. The femora ferruginous. 



Hab. North America ; Georgia ; Philadelphia. 



The species described by Fabricius under the name Larra 

 aurulenta I consider to be a closely aUied species, differing in 

 being smaller,— usually about 6i lines ; it differs also in having 

 a minute notch in the middle of the anterior margin of the cly- 

 peus, and also in having a longitudinal groove extending from the 

 base to the apex of the metathorax. This species is described 

 by St. Fargeau as the T. aurulenta of Fabricius. 



45. Tachytes trilobus. 



Lyroda triloba. Say, Bost. Joiirn. i. 372. 4. 

 Hab. North America (Indiana). 



46. Tachytes suijitus. 



Lyroda subita, Say, Bost. Journ. i. 372. 5. 

 " Hab. North America (Indiana). 



