28 PROCEEDIlSrGS OP THE NATIONAL MUSEUM vol.80 



Abdomen with first tergite much more than twice as long as broad 

 at apex, closely longitudinally aciculate, the spiracles slightly beyond 

 basal fourth and about as far from base of tergite as from each 

 other ; second tergite longer than broad, entirely finely aciculate, the 

 lateral depressed margins very narrow ; third tergite about as long 

 as broad, aciculate on basal half; following tergites smooth; oviposi- 

 tor sheaths as long as the body. 



Yellow-ferruginous ; palpi pale yellow ; antennal flagellum fuscous 

 or blackish ; mesonotal lobes and metanotum more or less fuscous or 

 blackish ; posterior coxae a little dusky at apex above ; wings hyaline, 

 stigma brown, conspicuously paler at base. 



Type. — In the collection of the Boston Society of Natural History. 



Type locality. — The island of Marthas Vineyard, Mass. 



Remarks. — Described from six female specimens taken by F. M. 

 Jones in July and August, 1930. The two paratypes with complete 

 antennae have them 53-segmented. There is more or less variation in 

 the extent of the fuscous or blackish markings of thorax; the poste- 

 rior coxae are sometimes entirely pale, and occasionally the apex of 

 the abdomen is blackish. Two of the paratypes are deposited in the 

 United States National Museum. 



18. MACROCENTRUS CLYPEATUS, new species 



Most similar to rohustus but at once separated by the unusually 

 broad clypeus, the much smaller, nonprominent eyes, and the broader 

 face. 



Fenmle. — Length 5.5 mm. Head much wider than thorax, rather 

 lenticular as seen in profile; face broad, nearly or quite twice as 

 broad as long, polished; eyes not large, not prominent, extending 

 but little beyond outer margin of temples ; temples and cheeks some- 

 what rounded; clypeus broader than length of second segment of 

 antennal flagellum; mandibles large, stout, the outer tooth very 

 strongly developed; vertex scarcely convex; ocell-ocular line very 

 nearly twice the diameter of a lateral ocellus; maxillary palpi 

 scarcely longer than width of head, the longest segment not distinctly 

 as long as second segment of antennal flagellum ; labial palpi short, 

 about as long as face; antennae 49-segmented. 



Thorax rather stout; notauli finely foveolate; propodeum trans- 

 versely aciculate, smooth at base ; mesopleura a little impressed below, 

 smooth, shining, with only a few setigerous punctures; metapleura 

 smooth ; prepectus defined only laterally ; apical teeth of all trochan- 

 ters well developed, conspicuous; radius arising from slightly 

 beyond middle of stigma ; metacarpus extending hardly beyond apex 

 of radial cell; first discoidal cell considerably longer than first 

 cubital ; second abscissa of cubitus nearly half as long as recurrent ; 



