184 ENTOMOLOGICAL NEWS. [May, '07 



size, yellow mark on scape and tubercles, more black on ante- 

 rior femora, etc. It is very close to P. piercei Crawford, but 

 has the front of scape yellow and the wings darker; possibly it 

 may prove to be only a variety of piercei. 



9. Panurginus piercei Crawford. 



Lincoln, West Point, Gordon, and Glen, Nebraska, August 

 12 to September 12, flying at Grindelia sguarrosa, Helianthus 

 annuus, Bidens chrysanthemoides and Solidago. This species 

 is quite variable in the male ; frequently the dog's ear marks 

 are partly or wholly black, and one specimen in our series of 

 eleven has the tubercles black also. 



The Nebraskan species of this genus may be separated by the 

 following tables : 



MALES. 



Pale color of face confined to clypeus, which is evenly convex and very 



sparsely punctured ; 8 mm malvastri n. sp. 



Pale color of face not confined to clypeus 1. 



1. Supraclypeal area black, or with only a small yellow spot ; wings hya- 



line 2. 



Supraclypeal area yellow ; wings dusky 6. 



2. Labrum and mandibles black ; 7.5 mm innuptus Ckll. 



Labrum yellow 3. 



3. Tuberdles black ; nervures blackish ; smaller, only 5.5 mm. long. 



renimaculatus Ckll. 

 Tubercles yellow ; nervures brownish ; over 7 mm. long 4. 



4. Median process of labrum more strongly narrowed toward the scarcely 



emarginate apex, its sides distinctly sinuate ; stigma brownish- 

 fuscous ; 8 mm stigmalis n. sp. 



Median process of labrum less strongly narrowed toward the distinctly 

 emarginate apex, its sides straight ; stigma pale brown ; 7.5 



mm 5- 



5. Clypeus uniformly punctured ; scape wholly black ; lateral face marks 



acute above ; striae at base of metathorax longer. 



expallidns n. sp. 



Clypeus with a basal median impunctate line ; scape yellow in front ; 



lateral face marks obtuse above ; striae at base of metathorax 



shorter . simulans n. sp. 



6. Clypeus~uniformly punctured ; upper limit of yellow on face curved ; 



6 mm ornatipes (Cress.). 



Clypeus with a median depressed impunctate line ; upper limit of yel- 

 low on face straight ; larger, 8-8.5 mm 7. 



7. Scape yellow in front horizontalis n. sp. 



Scape wholly black piercei Crawf. 



