1893.] NATURAL SCIENCES OF I'll I LADELPHIA. 477 



sans trace de ligue impressionnee sur le dos. — Ottawa (Guignard.)" 

 "Differe du politus Say, par sa plus petite taille, sa face argentee, 

 et l'absence de ligue impressionnee sur les segments abdoniinaux 1 

 et2." 



Trypoxylon sulcus La Munyou. 



T. sulcus La M., Proc. Nebr. Assoc. Adv. Sc, March, 1877. 



" Black; face, including the emargination of the eyes, and sutures 

 of the thorax clothed with dense, short, golden pubescence; other 

 portions of the body sparsely pubescent. Tibia?, tarsi, second seg- 

 ment of abdomen and second and third joints of the antenna? rufous. 

 Wings tinged with rufous, dusky at tips. Antennae subclavate, sub- 

 compressed. Metathorax long, deeply sulcate above. Two first 

 segments of the abdomen petiolate, constricted and deeply sulcate 

 beneath. The balance of the abdomen fusiform. Length f inch." 



Habitat, North Platte, (Nebraska;. This species is evidently 

 synonymous with texense Sauss. 



Trypoxylon unicolor Bve. 



T. unicolor Bve., Ins. Afr. et Ainer. p. 116, pi. 3. fig. 3. 



"Nigro-fuscum ; alarum apicibus fuscis; abdominis pediculo an- 

 gustissimo, cuneiformi elougato. (Fig. 3). Caroline du Sud. ' ' 



' ' Obs. De chaque cote, au has des premiers anneaux, on re- 

 marque une tache d'un gris blanc, formee par un duvet tres-mince, 

 un peu argente." 



NITELIOPSIS Saund. 

 Niteliopsis Saund., Tr. Eut, Soc, London, III, p. 410, 1873. 

 Solierella Kohl, (not Spin.) Verh.-zool. bot. Gesell., Wien, XXXIV, p. 207. 

 Niteliopsis Fox, Psyche, November, 1893, p. 555. 



Form similar to Pison. Head broader than the thorax ; mandibles 

 acute at tip, if emarginate on outer edge they are but very 

 slightly so; antennae long, slightly thickened medially, rather widely 

 separated from each other at their insertion ; flag ell urn joints distinct, 

 last joint semi-acute at tip (at least in 9)> ''.'/'>' rather strongly con- 

 verging, so that the space between them at the vertex is about 

 equal to a little more than half of the space between them at the 

 clvpeus ; ocelli regular and round, placed so as to form a tri- 

 angle, the hind pair lie distinctly before an imaginary line drawn across 

 the rertex from one jiosterior orbit to the other; top of prothorax not 

 reaching by far the level of the dorsulum; shoulder tubercles not reach- 

 ing the tegulre; dorsulum distinctly wider than broad; metathorax 



