24 ENTOMOLOGICAL NEWS. [January, 



clypeus. Clypeus rather high ; supraclypeal mark rectangular, nearly 

 square, very slightly broader than long, emarginate at top. Lateral marks 

 rapidly and evenly narrowing from top of dog-ear marks to a point on 

 orbital margin about level with the middle of the scape, forming thereat 

 an angle of about 45. Cheeks dark with only a yellow line extending 

 nearly half way up posterior orbital margin. Mandibles rufous at tips. 

 Scape yellow with a black patch on distal half above. Flagellum black 

 above, mostly dull yellowish below. Mesothorax dullish, microscopically 

 tessellate, median groove very distinct. Tubercles and a pair of large 

 spots on hind border of prothorax, connecting with them by a narrow 

 line, yellow. A patch on border of prothorax below tubercles also yellow. 

 Pleura wholly dark, metathorax distinctly bluish. Tegular hyaline with 

 a yellow spot. Wings hyaline, nervures and margin of stigma very pale 

 chrome yellow. Marginal cell somewhat obliquely truncate, poststig- 

 natal portion longest. Second submarginal large, narrowed one-half to 

 marginal. Third discoidal distinct. Legs yellow, with dark brown 

 markings. Femora for the most part dark brown beneath. Anterior and 

 middle tibiae with a dark streak behind, hind tibiae almost entirely brown, 

 except a yellow line down the front. Tarsi becoming whitish, claws dark. 

 Abdomen above dark brown, with five clean cut yellow bands, all nar- 

 rowly interrupted in the middle. These bands do not coalesce on lateral 



margin. Venter yellow. 



9. About 6 mm. long, if anything smaller than the $, the thorax 

 distinctly smaller, no dog-ear marks. The yellow markings apparently 

 somewhat reddened by cyanide in the specimen described. Clypeus 

 yellow with the usual dots and two heavy black bars. Supraclypeal mark 

 nearly twice as broad as lon^. Lateral marks receding from the clypeus 

 opposite the dot, curving gently upwards and outwards, then passing 

 along the orbital margin as a band of uniform width, abruptly truncate at 

 the upper level of the antennal sockets. Mandibles with slender dark 

 tips. Scape more slender than in <j\ Prothoracic spots reduced to short 

 lines or bands. Margin of stigma very pale orange contrasting with the 

 very pale brownish nervures. Femora dark except at apex, middle and 

 hind tarsi brownish. Abdomen banded as in the J\ but the bands not 

 so broad, and chrome instead of lemon-yellow. Venter dark brown. 



In my table of Perdita (Proc. Ph. la. Acad. 1896), the 

 bruneri runs at once to sphczralcece , from which it differs by 

 the interrupted abdominal bands, the comparatively dull meso- 

 thorax, etc. The 9 runs down to 80 affinis 9 variety, but 

 differs at once from that which has cream-colored markings, 

 dark nervures, and no well-developed supraclypeal mark. 



(3). Perdita SCXmaculata Ckll. 1895, var. punctata, Ckll., 1896. Lin- 

 coln, Nebr., September, one $. 



(4). Perdita ignota Ckll., 1896. Lincoln, Neb., September, one 9- 

 The head and thorax have a decided olive-green color, but otherwise the 

 specimen agrees with ignota from Mesilla, N. M. The occurrence of the 

 species in Nebraska was wholly unexpected. 



The above species are all Rocky Mountain types, representa- 

 tive of the upper Sonoran and Transition zones. 



ENTOMOLOGICAL NEWS for December was mailed December 5, 1896. 



