NEW AND LITTLE-KNOWN BEES FROM NEBRASKA. 191 



yellowish ; abdomen shining piceous, without light markings, but the 

 hind margins of the segments hyaline. 



? . Length 5 mm. ; similar to the male, but the lateral face- 

 marks are nearly equilateral triangles ; and the second, third, and 

 fourth abdominal segments have basal straight pale yellowish bands, 

 narrowly interrupted in the middle, and those on the third and 

 fourth segments terminating abruptly some distance before the lateral 

 margins. 



In my tables of Perdita, the male runs to P. vagans, and 



the female to P. higelovice ; but the face-markings are not as 



in those species, and other differences are apparent on com- 

 parison. 



Perdita maura, n. sp. — Cedar Bluffs (L. Bruner). Both sexes 

 at flowers of Aster. 



3" . Length about i^ mm. ; head and thorax dark bluish-green, 

 metathorax blue ; abdomen broad, shining black without marks, the 

 hind margins of the segments not hyaline. Head ordinary, cheeks 

 unarmed ; face- marks yellow ; clypeus yellow except the sides above, 

 and the whole of the upper median margin, the yellow therefore 

 occupying all the lower half of the clypeus, and sending a broad 

 tongue upwards in the median line ; supra-clypeal mark divided into 

 two adjacent patches ; no dog-ear marks ; lateral face-marks broadly 

 triangular, their upper angles (of about 45°) about level with the 

 anteunal sockets ; scape and flagellum dark brown above and yellow 

 or brownish yellow beneath ; face not hairy ; mesothorax granular, 

 with feeble punctures, median groove very distinct : thorax with 

 sparse short hair ; wings hyaline, nervures and stigma very dark 

 brown, third discoidal cell ill-defined ; marginal cell ordinary ; legs 

 black, knees, anterior tibiffi and tarsi, and middle tibite and tarsi, more 

 or less yellow. 



? . Length about 5^ mm. ; similar to the male, except as follows : 

 face wholly dark, but the mandibles are yellow with dark ferruginous 

 tips ; third discoidal cell distinct ; anterior tibife behind, and middle 

 tibiae, black. 



P. maura in my tables runs in the male to P. asteris, var., 

 but it is quite distinct from that species, which has milky wings 

 with almost colourless nervures and stigma. The female runs in 

 the neighbourhood of phymatce, but that is a much smaller and 

 less bulky insect. 



Spinoliella aastralior (CklL), Sioux Go. (L. Bruner). Both 

 sexes at Cleome flowers. New to Nebraska, 



East Las Vegas, New Mexico, U.S.A. : 

 Nov. 14th, 1900. 



Q 2 



