450 Mr. T. D. A. Cockerell on 



Halictus aquiltej sp. n. 



? . — Length about 8 millim. 



Dark oZ/ve-green, with black legs and antennae, shining, 

 with thin, erect, pale yellowish pubescence. Head rather 

 large, facial quadrangle broader than long, cheeks unarmed, 

 ocelli prominent and very close together; vertex very densely 

 punctured, as also the front, the face below the antennae more 

 sparsely punctured ; lower half of clypeus purple-black, lower 

 corners of face black ; mandibles black, obtusely bidentate ; 

 scape punctured, flagellum wholly dark ; mesothorax with a 

 minute lineolate or subtessellate sculpture and rather strong 

 hut sparse punctures ; metathorax strongly truncate, the trun- 

 cation rough and sculpjtured with ridges, and bounded by a 

 strong rim ; base of metathorax bounded by a rim, minutely 

 radiately wrinkled ; teguloi piceous, the anterior half punc- 

 tured; wings hyaline, with a yellowish tinge, nervures and 

 stigma a rather dark yellowish brown, third submarginal cell 

 narrowed less than half to marginal ; legs quite hairy ; 

 abdomen dark green, black at the extreme base, very 

 minutely and not densely punctured, little pubescent, without 

 hair-bands. 



Hal. South Fork of Eagle Creek, about 8000 feet, foot of 

 east slope, on foliage, Aug. 21, 1898 [C. H. T. Townsend). 

 II. oquilce is closely related to H. nymp/hcearum, Eob., of the 

 Eastern States ; it is also related to H, connewus. Cress., from 

 Texas. 



Perdita phacelioe^ sp. n. 



$ . — Length 3-^ millim. 



Head ordinary, face dark bluish green, vertex dark olive- 

 green ; vertex minutely roughened ; clypeus rather convex, 

 shiny, with very sparse ])unctures ; a sutiused pallid spot near 

 eachlower corner ot clypeus; mandibles dull yellowish, grooved, 

 tips dark ferruginous ; antenna piceous above, mostly ferru- 

 ginous beneath ; mesothorax minutely granular, with some 

 scattered white hairs, its colour black, shining greenish in 

 certain lights ; scutcllum and postscutellum black ; meta- 

 thorax dark blue-green, strongly contrasting ; the metathorax 

 may be dark blue and the pleura of the same colour ; legs 

 black, with ^^hite hairs, small joints of tarsi more or less 

 pallid, anterior tibiae entirely pale in front ; tegulaj hyahne 

 colourless ; wings perfectly clear, splendidly iridescent, ner- 

 vures and margin of the hyaline stigma white ; marginal cell 

 squarely truncate, very short, its substigmatal portion almost 

 twice as long as the poststigmatal ; second submaro-inal 



