Studies of North American Bees 37 



Stelis (Chelynia) subemarginata Cresson c^. 



Two males collected at Lisbon, North Dakota, June 5, 191 3, on 

 Zisia aurea (O. A. Stevens, 4593-4594) are with little doubt 

 that previously unknown sex of this species. They may be de- 

 scribed as follows : 



Length 8 mm. Black, clothed with white pubescence, most copious on 

 face, pleura and legs. Punctured as in the ?. Tergites i-S with narrowly 

 medially interrupted yellowish white bands on the middle of the tergite, 

 those on 2 and 3 not obviously emarginate on the sides posteriorly. Vena- 

 tion as in the $. 



Allotypc.—lAshon, North Dakota, June 5, 1913, on Zhia aurea 

 (O. A. Stevens, 4593). 



Anthidium porterae Cockerell. 



A series of eighteen females and nine males from Mitchell, 

 Scottsbluff county, collected in 1913 and 1914 by L. M. Gates, 

 gives the species a season of June 28 to August 25 for that 

 locality ; the series was collected on alfalfa and sunflower 

 blossoms. 



Anthidium emarginatum (Say). 



Two typical females were collected at Mitchell, Scottsbluff 

 county, July 5 and 8, 1913, on flowers of alfalfa, by L. M. Gates. 



Anthidium tenuiflorae Cockerell. 



A male from near Lander, Wyoming, is in the University of 

 Kansas collection (1781). 



Anthidium astragali Swenk. 



Two male metatypes from Mitchell, June 13 and 16, 1914, 

 on alfalfa blossoms (L. M. Gates) ; one is typical but the other 

 lacks the yellow lines on the mesoscutellum. 



Anthidium nebrascense Swenk. 



I was surprised to find a male from Truckee, California, 

 August 4, 1914 (L. Bruner), referable to A. nebrascense on 

 tareful comparison with the type from Sioux county, Nebraska. 



191 



