450 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 54- 



31. STYLOPS ANDRENOIDES Pierce. 



Table of measurements of female. 



The material may possibly contain two or more or distinct species, 

 but it is more likely that the differences are accounted for by specific 

 variation. 



32. STYLOPS MEDIONITANS, new species. 



Described from one female extracted from an Andrena medioni- 

 tans Cockerell, determined by Cockerell, collected at Florissant, Colo- 

 rado, June 24, on Cerasus melanocarpa^ by T. D. A. Cockerell. 



Female. — Cephalothorax yellowish brown with dark basal band; 

 rather broad and rounded; strongly constricted at base; spiracles 

 marginal, not prominent; mandibles dentate at apex, strongly 

 rounded at outer apical angle and angulate on side. 



Length of cephalothorax, 0.8 mm. ; breadth, 0.8 mm. 



Table of measurements. 



Type.— Cat No. 21444, U.S.N.M. 



Geoup 12. 



33. STYLOPS SINUATUS, new species. 



Described from two specimens from Andrena mandibularis Robert- 

 son, collected April 10, at Carlinville, Illinois, by Charles Robertson, 

 but differing from Stylops mandibularis m the same host by numerous 

 characters. 



