12 Myron Harmon Swenk 



nation. As the female of serranum has never been described this 

 specimen becomes the allotype of the species, and may be easily 

 recognized by the characters given in the synoptic table. 



Anthidium psoraleae Robertson. 



1902. Anthidium psoraleae Robertson, Canadian Entomologist, XXXIV, 



p. 322, ? (?. 



1903. Anthidium psoraleae Robertson, Trans. Am. Ent. Soc, XXIX, 



p. 175, ? <S. 



The writer captured a male of this species at Lincoln, June 23, 

 191 2, at flowers of Psoralea tenuiflora. On June 17, 1902, J. C. 

 Crawford captured a pair of this species in copula at Springview 

 Bridge, Brown county, Nebraska, on the same flower, and later 

 captured an additional male in the same locality, June 23, 1902, 

 also on Psoralea tenuiflora. These are the only captures of this 

 species in the state. 



Anthidium clypeodentatum n. sp. 



5. Length 11 mm. Clypeus black, coarsely cancellately punctured with 

 a central apical area of much coarser and more separated punctures, 

 apical margin with about six distinct teeth forming a continuous row. 

 Face coarsely closely punctured. Antennae black, the scape with lateral 

 brushes of white hair, joint 2 or 4 about one-third shorter than 3. An 

 oblong yellow mark on each side of vertex behind eye. Spot on tegulae, 

 line above, a short broad line on each side of anterior margin of meso- 

 scutum, spot on tubercles and four large oval spots on mesoscutellum, deep 

 yellow. Legs wholly black, clothed with white pubescence except on inner 

 surface of tarsi where it is rufous and black. Mesopleura with dense 

 grayish white hair, that on thorax above very slightly tinged with ochreous. 

 Abdomen closely punctured, tergites 1-5 with deep yellow bands, all inter- 

 rupted medially and deeply emarginate on the anterior margin of each half 

 laterally, except on the first tergite where the emargination is on the pos- 

 terior margin. Pygidium wholly black, densely punctured above, its margin 

 broadly truncate but with a stout, median, bifid, forwardly directed tooth 

 from which arises a median carina which crosses the tergite transversely. 

 Ventral scopa white. Wings subhyaline, slightly darkened apically. 



Type. — Sioux county, Nebraska, $. 



This species is allied to psoraleae, but differs in its differently 

 shaped pygidium, sexdentate clypeal margin, lines on mesoscutum, 

 paler wings and different abdominal maculation. From porterae 



12 



