REVISION" OF STREPSIPTERA PIERCE. 105 



Female. — Length of cephalothorax 0.73 mm., breadth at spiracles 

 0.74 mm'., breadth at base of head 0.41 mm., distance between man- 

 dibles 0.09 mm. Cephalothorax light yellowish brown with narrow 

 dark-brown band at base, half on the thorax and half on the first 

 abdominal; as long as broad, truncate wedge-shaped, edges very 

 nearly straight, angles sharp; truncation less than one-third the 

 breadth at the spiracles. Mandibles rounded with an outward curved 

 tooth at apex. Spiracles laterally prominent. 



Type.— Cat. No. 10095, U.S.N.M. 



22. STYLOPS NASSONOWI, new species. 



Stylops mellittae Nass.onow, 1893 a. 



Host. — Andrena carbonaria Fabricius; recorded parasitized from 

 Germany and Egypt. 



Female. — Cephalothorax light brownish with concave dark band at 

 base; slightly longer than broad, narrowly and squarely truncate at 

 apex ; truncation a little less than one-fourth the breadth at the spir- 

 acles. Lateral margin convex. Spiracles laterally prominent. 



This description is imperfect, as it is drawn from the figure (Nasso- 

 now, 1893 a, pi. 1, figs. 1,7). 



23. STYLOPS NUBECULA, new species. , 



Host. — Andrena nubecula Smith (det. H. L. Viereck); Colorado; 

 C. F. Baker, collector. Described from one female from the Baker 

 collection of the U. S. National Museum (pi. 4, fig. 2). 



Female. — Length of cephalothorax 0.84 mm., breadth of spiracles 

 0.94 mm., breadth at base of head 0.51 mm., distance between man- 

 dibles 0.12 mm. Cephalothorax light yellowish brown with convex 

 dark-brown band at base, half on the thorax and half on the first 

 abdominal, the convexity filled with a lighter brown, and the band 

 laterally interrupted before reaching the spiracles; broader than long; 

 wedge shaped, narrowly and convexly truncate at apex; truncation 

 slightly less than one-third the breadth at the spiracles. Lateral mar- 

 gin almost straight, slightly sinuate. Mandibles broad, subquadrate 

 with an outward curved tooth at inner edge, outer edge rounded. 

 Posterior margin of mouth rounded. Spiracles lateral, but not very 

 prominent. 



Type.— Cat. No. 10096, U.S.N.M. 



24. STYLOPS PACKARDI, new species. 

 Stylops childreni Packard, 1864, 1872. 



Host. — Andrena j)lacida Smith; Salem, Massachusetts, April 29, 

 on Mezercon; collected by A. S. Packard. 



