Studies of North American Bees 19 



tellum, broad stripes on first four femora beneath and a short stripe on 

 apex of hind femora beneath, outer faces of all of the tibiae except some- 

 times a dark subapical spot, all the basitarsi externally, four spots on first 

 abdominal tergite, broad medially interrupted bands on tergites 2-5 which 

 are emarginate on the anterior margin, and all of tergite 6 except a narrow 

 median band, orange yellow. Pygidium broadly rounded, without dis- 

 tinct lateral angles or teeth. Clypeal margin slightly concave between the 

 pair of strong teeth on either side. Head and thorax opaque, roughened 

 by a fine and very dense puncturation. Pubescence pale, dull gray on 

 vertex and mesonotum, elsewhere longer and white except for the usual 

 reddish hair on the inner side of the tarsi. Ventral scopa white. Wings 

 subhyaline, slightly darkened on the apical margin, nervures black. 



Type. — Palo Alto, California, July 2, 1891 (Lot 66, Leland 

 Stanford Jr. Univ.), $. 



Paratype. — Pacific Grove, California, July, 1894, $. 



Differs from A. placitum, A. praedentatum and A. p. triangu- 

 liferum in lacking the angular yellow stripe on mesoscutum and 

 in having the band on the pygidial tergite interrupted; from A. 

 blanditum and its form pecosense in the largely dark clypeus ; 

 from A. poudreimi in the banded femora and interrupted band on 

 pygidial tergite; from A. montivagum Cresson in larger size and 

 different maculation. 



Anthidium hesperium dentipygum n. subsp. 



$. Length 10 mm. Similar to typical A. hesperium, but the sides of the 

 broadly rounded pygidium have very distinct teeth, the yellow on the cly- 

 peus is reduced to large spots at the sides which are nearly confluent 

 with the facial spots, and the spots on each lateral half of tergite i are 

 sometimes connected. 



Type. — Laramie, Wyoming, $. 

 Paratype. — Type locality, i $. 



Anthidium transversum n. sp. 



?. Length 8.5 mm. Black; clypeus except two oval dots at base, tri- 

 angular areas at sides of face between clypeus and orbits, mandibles ex- 

 cept tips, oval spots on vertex behind eyes, front half of tegulae and a 

 spot on hind margin, lines over tegulae, lines on anterior lateral margins 

 of mesoscutum, tubercles, four spots on mesoscutellum of which the inner 

 pair are much the larger, lines on first four femora behind, stripes on 

 outer faces of all of the tibiae, four spots on first abdominal tergite, me- 

 dially interrupted bands on tergites 2-5 which are more or less emarginate 



19 



