1 6 Myron Harmon Szvenk 



undetermined borage. The females agree exactly with Say's 

 original description, but they differ from Cresson's description of 

 his Kansas specimen in having the band on tergite i interrupted 

 medially and not indented on the posterior margin, but sometimes 

 enclosing a central black spot (which may break through on the 

 anterior margin to form a narrow and deep diagonal emargina- 

 tion) as he described for A. atrifrons, which he later recognized 

 as synonymous with A. emarginatum but which was described 

 from four females from Colorado. From A. t emu florae Ckll., 

 this species may be known in the female by the four yellow spots 

 on the mesoscutellum, arranged in an arc, as contrasted with the 

 wholly black mesoscutellum of tcnuiflorae, the yellow tubercles 

 (black in teniiiflorac) and the long conspicuous yellow stripe on 

 the external faces of the tibiae (in tcnuiflorae there are only the 

 small knee spots). The male is distinguishable by the linear 

 yellow spots on the mesoscutellum and the more narrowly rounded 

 lobes of the pygidium, the emargination between the apices of the 

 lobes and the median spine being twice as broad as deep (scarcely 

 broader than deep in tenuiflorae). 



Anthidium emarginatum (Say) var. 



A female collected at INIitchell, Scottsbluff county, Nebraska, 

 July 29, 1912, on flowers of alfalfa, by L. M. Gates, differs from 

 the Sioux county females in the much darker scopa, paler macula- 

 tions, less extensively pale tibiae, and especially in the lack of the 

 outer pair of mesoscutellar spots. Possibly it may be distinct, 

 but for the present is best considered merely a variety of 

 emarginatum. 



Anthidium astragali n. sp. 



(^. Length 9-10 mm. Clypeus, sides of face up to level of insertion of 

 antennae, and broad stripe on front of scape, yellow; rest of head, except 

 a yellow oblong mark on vertex behind the tops of the eyes and the yellow 

 mandibles, black. Scape densely hairy. Clypeus with the apex sinuate but 

 not dentate. Mesoscutellum with merely two narrow lines on posterior 

 face. Yellow bands on abdominal tergites 1-6, usually interrupted me- 

 dially and with very deep emarginations on the anterior margin, entirely 

 cutting through on tergite i and dividing the band into four spots, the 

 external segment wanting on 6, leaving comma-shaped marks. Pygidium 



16 



