REVISION OF STREPSIPTERA PIERCE. 103 



Male, — The male can be sufficiently differentiated from any others 

 described by means of the antenna? alone, and has thus been sep- 

 arated in a table at the beginning of this genus. 



16. STYLOPS GR^ENICHERI, new species. 



Host. — Andrena nivalis Smith; Milwaukee, Wisconsin, June 11, 

 1901; S. Graenicher, collector. Described from one specimen pre- 

 sented to the writer by Doctor Graenicher (pi. 3, fig. 7). 



Female. — Length of cephalothorax 1.10 mm., breadth at spiracles 

 1.26 mm., breadth at base of head 0.66 mm., distance between man- 

 dibles at base 0.19 mm. Cephalothorax light brown with dark trans- 

 verse band at base; broader than long, convexly truncate at apex, 

 sides convex, slightly constricted at base of mandibles; apical trunc- 

 ation about two-ninths of the breadth at spiracles. Mandibles 

 obtuse, armed at apex with outward curving tooth, and tuberculate at 

 basal third of outer edge. Mouth elliptical. Spiracles lateral, very 

 prominent. 



Type.— Cut. No. 10090, U.S.N.M. 



This species is dedicated to the honor of Dr. Sigmund Graenicher, 

 the collector, who has done such excellent work on the biologies and 

 flower relations of the bees in his neighborhood. 



17. STYLOPS HARTFORDENSIS, new species. 



Host — Andrena hartfordensis Cockerell (det. H. L. Viereck) ; Thom- 

 asville, Georgia, March 27, 1902. Described from one specimen (pi. 

 3, fig. 8). 



Female. — Length of cephalothorax 0.69 mm., breadth of spiracles 

 0.67 mm., breadth at base of head 0.43 mm., distance between man- 

 dibles at base 0.12 mm. Cephalothorax light yellowish, with broad 

 dark-brown band at base ; slightly longer than broad, elongate trape- 

 zoidal, squarely truncate at apex; truncation a little more than one- 

 third the breadth at the spiracles. Lateral margin almost straight 

 from apical truncation to spiracles except for a constriction at the 

 base of the mandibles. Mandibles blunt with very prominent out- 

 ward curving tooth at apex, and with a large tumidity at the middle 

 of the outer edge. Mouth elliptical, posterior margin almost straight. 

 Spiracles dorsal, barely perceptible on lateral margin. 



Type.— Vat. No. 10091, U.S.N.M. 



18. STYLOPS HIPPOTES, new species. 



Host. — Andrena (Trachandrena) Mppotes Robertson (det. H. L. 

 Viereck); Columbus, Ohio, April 21, 1902; J. C. Bridwell, collector. 

 Described from one female (pi. 3, fig. 9). 



Female. — Length of cephalothorax 0.83 mm., breadth at spiracles 

 0.83 mm., breadth at base of head 0.53 mm., distance between man- 



