206 ENTOMOLOGICAL NEWS [May, '13 



the antennal fossae; clypeus produced half its length beyond the lower 

 margin of the eye ; face opaque except over the clypeus and f rons, at 

 the lower tip of the median carina; very closely punctured above and 

 finely roughened below. Mesothorax opaque throughout, rather finely 

 and very closely punctured, and finely roughened ; parapsidal grooves 

 short, median groove distinct, much deeper in front. The disc of the 

 scutum blue-green, the scutelluni and postscutellum brassy-green. 

 Basal area of the metathorax with a low, rounded, finely roughened 

 rim with numerous very crooked rugae, which are straighter and more 

 distinct near the sides. Tegulae pale testaceous. Wings amber hya- 

 line ; stigma and nervures pale testaceous. Tarsi dark brown. Abdo- 

 men rather broad and blunt, rich metallic green ; the disc of even the 

 first segment finely punctured ; the very narrow apical margin of each 

 segment testaceous, segments 3 to 5 densely covered with short, closely 

 appressed, pale grayish or whitish hair. Pubescence comparatively 

 abundant and whitish throughout, somewhat ochraceous on the legs 

 and scutellum. 



Hab. Florissant, Colorado, two (= type"), 6.9 mm. long, on 

 sand, June 14, 1908 (S. A. Rohwer) ; one nearly 7 mm. long, 

 June 21, 1908, (S. A. Rohwer) one 7 mm., June 23, 1907 (S. 

 A. Rohwer). 



This species is very near H. pruinosus Rob. from which it 

 differs in the yellow wings, and finely punctured disc of the 

 first abdominal segment. The pubescence of the abdomen is 

 not yellow as in H. pilosiis Sm. 



Halictus pavoninus sp. nov. 

 9. — Head and mesothorax dark, greenish blue; basal area of the 

 metathorax and the abdomen darker blue. Head a little longer than 

 broad, narrowed below and with the clypeus produced so that the face 

 appears triangular, eyes narrow ; face finely and closely punctured, 

 only the frons and clypeus shiny; under side of the flagellum dusky 

 testaceous. Mesopleura with shallow, coarse, irregular punctures ; 

 upper end of the metapleura with three or four irregular plicae di- 

 rected toward its upper anterior angle; mesonotum somewhat shiny 

 in spite of the numerous, close, rather fine punctures. Basal area of 

 the metathorax without a rim, the edge broadly rounded and finely 

 roughened, slightly indented at the middle, plicae weak, numerous, and 

 irregular. Teguk-e pale testaceous, darker at the base. Wings brown- 

 ish hyaline: third suhmnroinal cell one and one-hnlf as wide as the 

 second ; stigma dusky testaceors, nervures dusky te.^taceous to dark 

 brown on the costal nervure. Legs black to piceous. inner spur of the 

 liind tibia witli a series of four or five graduated teeth. Abdomen 



