Studies of North American Bees 23 



Type. — Fargo, North Dakota, June 22, 191 3, on Zisia aurea 

 (No. 5320, O. A. Stevens) J*. 



Allotype.— Type lot (No. 5319), ?. 



Par a types. — Type locality, June 14, 191 3, on Zisia aurea (No. 

 4860), I J^; do., June 15, 1913 (Nos. 4921-23), i $, 2 J' ; do. 

 (C. H. Waldron, Nos. 4953-4957), 3 ?, 2 ^; do., June 16, 1913 

 (Nos. 5009-10), 2 (^ ; do., June 18, 1913, on Erigeron phila- 

 delphicus (No. 5028), i J*; do., June 19, 1913, on Zisia aurea 

 (Nos. 5088-5091), 35, I J^; do., June 20, 1913, on Melildtus 

 officinalis (No. .5111), i J*; do., June 21, 1913, on Zisia aurea 

 (Nos. 5156-61 and 5164), 4 $, 3 J*; do., June 21, 1913, on 

 Erigeron philadelphicus (No. 5209), i J*; do. (C. H. Waldron, 

 No. 5261), I (^ ; do., June 22, 1913, on Rubus strigosus (No. 

 5277), I 5; do., June 22, 1913, on Zisia aurea (Nos. 5315, 5317- 

 18, 5321-23, 5325), 3 $, 4 c^; do., on Erigeron philadelphicus 

 (No. 5332), I 5; do., June 7, 1914, on Zisia aurea (No. 8053), 

 I $; do., June 17, 1914 (Nos. 8081-85, 8088-89), 4 ?, 3 c^; do., 

 on Erigeron philadelphicus (No. 8094), i J*; do., June 20, 1914, 

 on Zisia aurea (Nos. 8124-30), 6 $, i (^. 



Very close to N. riihi, just described, but I believe distinct; at 

 least the two series are separable with reasonable certainty by the 

 characters given in the table. 



Nomada (Gnathias) lepida Cresson, var. 



A series of seven males from Fargo, North Dakota, May 6, 

 1913, on Prunus americana (No. 4373) and Salix sp. (No. 4393- 

 98), received from Mr. Stevens are certainly referable to N. 

 lepida but all have the scape in front red, the mesoscutum red 

 except for the anterior and posterior margins and a median black 

 line or with two large red areas, the mesopleura mostly red or 

 with large red spots, sometimes two broad red bands on the pro- 

 podeum and the ground color of the abdomen mostly light red. 

 While similar specimens occur elsewhere in the range of A^. 

 lepida, they are not usually found so uniformly reddened as this 

 North Dakota series. A typical lepida (^ is before me from Lee 

 county, Texas, March 21 (G. Birkmann). 



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