44 Trans. Acad. Set. of St. Louis. 



quadate shining pits, posteriorly densely punctured ; meta- 

 thorax with usual transverse series of pits, truncation with 

 lateral faces bordered by salient rim ; anterior coxae with 

 short, stout spines; wings subhyaline, second submarginal 

 cell longer than third, tegulae and nervures dark : abdomen 

 somewhat shining, sparsely and rather feebly punctured, ex- 

 cept towards apex; segments somewhat depressed at base and 

 apex, base of second and apical margins of segments 1-5 

 with thin fasciae of whitish pubescence. Length 10-12 mm. 



g. — Antennae long, fourth joint as long as second and 

 third together; pubescence on face, cheeks and front femora 

 rather long and dense; space between eye and base of man. 

 dible hardly wider than in female; legs slender, abdomen a 

 little more shining. Length 9-10 mm. 



Carlinville, Illinois; 3 5, 2^ specimens. Of the species 

 known to me this is the most bare. Of those with black hairs 

 on mesonotum the male has the most evident prothoracic spines 

 and the shortest space between eye and mandible, the female 

 has more evident coxae and prothoracic spines than any 

 except O. armatus Pttn. 



Halictds pectoralis Sm. 



Halictus pectoralis Smith, Brit. Mus. Cat. Hym. 1: 68. $. 1853. 



$. — Closely resembles the female; clypeus without pale 

 markings; the joints of the antennae, except the scape, of 

 about equal length, making the antennae quite short. Length 

 5-6 mm. 



Carlinville, Illinois ; Inverness and Orlando, Florida ; 50 5, 

 12 $ specimens. 



In the female the second and third segments of abdomen 

 have a patch of whitish pubescence on each side of base. This 

 species varies with the punctures quite fine and sparse aud the 

 inclosure of metathorax poorly defined. 



Halictus lerouxii Lep. 



Halictus Lerouxii Lepeletier, Hist. Ins. Hym. 2: 272. $. 1841. 

 Halictus parallelus Smith, Brit. Mus. Cat. Hym. 1 : 72. 1853. 

 Halictus parallelus Packard, Am. Nat. 1 : 602. 1868. 

 $. — Resembles the female; black, clypeus anteriorly, 

 labrum, middle of mandibles sometimes, knees, tibiae except 



