168 AMERICAN HYMENOPTERA. 



noted that it is quite different from the % of quadrbnaculatus as 

 described by Robertson. The females of pectoraloide.'i and quadri- 

 macnlatus are so much alike that it is hard to believe that they would 

 have quite different males. The punctuation of the abdomen is not 

 nearly so strong as in the Santa Fe insect just described above. 



Hab. — Las Cruces, New jNIex., on Solidago canadensis November 

 15 ; and on supposed F Liver ia August 25. 



ii. A comparatively large and stout species, the face not covered 

 with white pubescence. 

 Halictus Misyinbrii Ckll. ( J supra). 



What I suppose to be the S of this is quite stoutly built, like a 

 5 , larger than pectoraloides, with more or less broadly interrupted 

 abdominal hair-bauds, which are oblique and best developed at the 

 sides. The abdomen is strongly punctured ; the stigma is rufescent 

 with a dark margin ; tegulse testaceous. Length 8 mm. 

 Hab. — Watrous, New Mex., July 13; two specimens. 



(c.) Small, slender species, with the thorax black and the ab- 

 domen largely rufous. 



Halictiis seinicoloratuN u. sp. 9-— Length about 4.5 mm. Slender, 

 head and tliorax black. Abdomen orange rufous, largely sutfnsed with blackish 

 on the third and following segments. Head fairly large, broader than long; face 

 covered with white appressed pubescence ; the lower half of the clypeus bare, 

 shining, with large, scattered punctures; mandibles rufous; front dullish, with 

 rather large very close punctures ; antennae short and stout, fiagellum sepia-brown, 

 its first joint broader than long. Thorax rather small, the white pubescence 

 sparse; mesothorax shining, with large, moderately close punctures; enclosure 

 of metathorax longitudinally ribbed, bounded by an obtuse, but prominent rim. 

 Legs brown-black, hind tarsi pallid ; tegulse testaceous. Wings rather short, 

 hyaline, beautifully iridescent, nervures and stigma piceous, second submarginal 

 cell very narrow. Abdomen long and narrow, shining, without hair-bands, or 

 any conspicuous pubescence, punctured, but the punctures very minute. 



Hab. — Las Cruces, New Mex., on Sisymbriuvi March 23, 1896. 

 A very distinct species. 



HalictiiS sp. % . — Similar to semicoloratus, but larger, the antennse long and 

 black ; the abdomen black, with the apical sides of first segment, the base and 

 sides of second, the sides of third, and the entire venter of 2 and 3 deep rufous ; 

 mandibles rufous only at tips; tegulje shining, piceous; enclosure of metathorax 

 with the longitudinal ridges close and wrinkled. Wings beautifully iridescent ; 

 second submarginal cell very narrow. 



Hab. — Santa Fe, New Mex., on Solidago canadensis August 2 

 (Ckll. 4045). 



A species very near to the last, but surely distinct. A name is 

 not now given, as it is hoped that the 9 '"^J ^^e found, and the 

 validity of the species thus confirmed. 



