Feb., '07] ENTOMOLOGICAL NEWS. 53 



below yellowish. Tegulaa yellow. Wings milky white, the nervures 

 and stigma pallid. All of the knees and the front face of the anterior 

 tibiae yellow, legs otherwise brownish black. Abdomen brownish 

 black, all of the segments except the last, crossed by very broad, sub- 

 basal, yellow bands, the first three notched medially on the posterior 

 margin. Pygidium and venter brownish black. Pubescence short, 

 erect, pure white, densest on cheeks, pleura and as fringes on the last 

 three abdominal segments. 



o*. Length 4-5 mm. Mandibles, labrum, a line half way up posterior 

 margin of eye orbit, clypeus, supraclypeal area, sides of face in a broad 

 line extending far beyond insertion of antennas and ending truncately, 

 scape and all except a portion of upper surface of flagellum, deep yel- 

 low, the dogVear marks contrastingly black. A line on prothorax 

 extending to large spots on the tubercles, yellow. All the knees, the 

 front face of all the femora and of first four tibiae and anterior tarsi 

 within yellow. Abdomen five-banded as in ?, the two last segments 

 dark. Otherwise like ?. 



Types: Glen, Sioux County, Nebraska, August 20, 1906, on 

 Helianthus petiolaris (H. S. Smith), ? $. 



Paratypcs : 23 9 $ and 49 $ $ from the type locality, 

 "\Yarbonnet Canon, Crawford, Niobrara and Neligh, Nebraska. 



This species flies from July 12 to August 24, and though pri- 

 marily a visitor of Helianthus, it occasionally strays to the 

 flowers of Solidago missouriensis and Melilotus alba also. It 

 is very distinct in its markings and has no close relative. In the 

 tables of Pcrdita in Proc. Phil. Acad. Nat. Sci. the 9 runs to 

 bigeloviac and the $ to sphacralceac var., but it is not either 

 of those. 



4. Perdita nebrascensis n. sp. 



5. Length 6 mm. Head, prothorax and mesothorax aeneous green 

 marked with yellow, the metathorax abruptly blue. A basal trilobate 

 clypeal mark (the lateral lobes being very small and short, the median 

 one large and broad), the supraclypeal area, subtriangular lateral face- 

 marks running up contiguous to the orbits and terminating acutely just 

 beyond level of insertion of antennas, spot at base of mandibles, whole 

 scape and the flagellum beneath, a large spot on tubercles, first four 

 tarsi, their tibrc inside and below, and all the knees, yellow. Tcvjul.r 

 yellow. Wings hyaline, their nervures dark, the stigma pale centrulK. 

 Abdomen black, the middle of segment I with a narrow, medially inter- 

 rupted yellow band, the base of segments 2-5 with similar narrow 

 transverse bands, continuous but not attaining the lateral margins of 

 the segments, the last one very narrow, the pygidium pale. Venter 



