146 CHARLES ROBERTSON. 



same. It is common in Illinois, and there can be no question about 

 its being the insect found by Say in Indiana. 



Halictus lerouxii Lep. (^ H. parallelus Sm. nee Say.) 



Halictus coerulous 9 • — Head, thorax and abdomen above of a uniform 

 l)rilliaut blue, smooth and shining, clothed with thin pale pubescence; face 

 broad, clypeus slightly produced, mandibles rufous before apex, antennje dull 

 testaceous beneath towards tip : mesonotura and scutellum sparcely and finely 

 punctured; metatborax retracted, truncate, the disc with longitudinal raised 

 lines. Wings hyaline, nervures and stigma fuscous, tegulse piceous. Legs fus- 

 cous or dull testaceous, hind spur with three or four teeth. Abdomen shining, 

 almost impunctate, with very thin white pubescence. Length 6 mm. 



% . — Eesembles the female ; face rounded, clypeus abruptly, but not strongly 

 produced; antennae moderately long, dull testaceous beneath; the tarsi, and 

 sometimes the knees, pale testaceous. Length 5 — 6 mm. 



Hab. — Illinois ; four male and five female specimens. It is easily 

 separated from the rest of our Halictus by its blue color, 



Auguchlora similis 9- — Green, the thorax and abdomen more golden, 

 clothed above with yellowish pubescence; labrum, middle of mandibles, flagel- 

 lum, nervures, stigma and tegulje. base and apex of tibiae and tarsi, and narrow 

 edge of abdominal segments testaceous; mesothorax evenly punctured in the 

 middle, reticulate on the sides; metathorax retracted and rounded posteriorly, 

 disc with fine longitudinal lines not reaching the apex, which is smooth and 

 shining. Wings hyaline. Legs dull testaceous, hind spur serrate with numerous 

 fine teeth. Abdomen beneath dull testaceous. Length 4 — 6 mm. 



%. — Eesembles the female; apex of clypeus, labrum, mandibles, except tips 

 and tarsi, whitish ; antennae beneath and tibiae almost entirely testaceous ; fourth 

 ventral segment broadly emargiuate. Length 5 — 6 mm. 



Hah. — Illinois; nine male, nineteen female specimens. This spe- 

 cies is very closely allied to A. piira Say. It differs in its smaller 

 size, golden color, in the antennte, tegulae, nervures, legs, etc., being 

 more extensively testaceous. The metathoracic striae do not reach 

 the edge of the truncation, as is commonly the case in A. pura. It 

 resembles A. aurata, as described by Smith, but the disc of the 

 metathorax has no enclosed space "surrounded by a sharp curved 

 ridge." 



Augochlora labrosa Say. 



This species is common in Illinois. It has abundant characters 

 distinguishing it from A. pura and A. siynilis, one of the most ob- 

 vious being its mesothorax evenly punctured and not reticulated on 

 the sides as in those species. The male is distinguished by the fourth 

 ventral segment not being broadly emarginate as in A. pura and A. 

 similis. 



