THE CANADIAN ENTOMOLOGIST. 181 



2. Marginal cell pointed, 

 i. 5 with wings tinged yellowish, stigma pale ferruginous, abdomen 

 impunctate ; S with clypeus dark; hind tarsi clear ferru- 

 ginous in both sexes. 



Andrena salicinella, Ckll., Psyche Suppt., 1S95, p. 4. The type 

 was taken on willow, but was unique, and among many bees collected on 

 willow at the same place, May 2nd and 3rd, 1896, are no salicinella. Both 

 sexes were, however, taken in quantity on Sisyinb^-inm canescens, on the 

 College Farm, Mesilla Valley, N. M., April 12th and i6th, 1895, the males 

 predominating. 



The ^ differs by the face being covered with dense white pubes- 

 cence, the flagellum ferruginous beneath ; the wings clear, not yellowish ; 

 the stigma reddish brown, darker than in the 2; the abdomen narrower, 

 but distinctly banded. When I published salicinella, Miss J. E. Casad 

 had already described the species as new (in MS.) from the $ , but I was 

 not aware that her insect was the opposite sex of mine. 



Miss Casad has described (in MS.) another species from a ^ taken 

 on Krynitzkia (supposed to be K. Jamesii), on Little Mountain, Mesilla 

 Valley, April ist, 1895. This is smaller than $ salicinella, and the head 

 seems very much broader in proportion to its length ; but the latter feature 

 is probably due, at least for the most part, to the retraction of the mouth- 

 parts and the absence of the dense white clypeal pubescence, except at 

 the sides. My present opinion is that it is probably an individual 

 mutation of salicinella, but it may be a distinct but closely allied species, 

 ii. Wings not tinged yellowish, hind tarsi not clear ferruginous. 



a. Clypeus dark in the $ , abdomen tessellate but impunctate. 



Andrena monilicornis, n. sp. — $. Length about 8^ mm. Black, 

 with long dull white pubescence. Head broader than long, face densely 

 covered with long white hairs, cheeks less densely ; vertex bare, flattened 

 or even slightly concave, microscopically reticulate, and with large, rather 

 sparse punctures. Antenna? long, wholly black, the joints somewhat 

 swollen, moniliform, first joint of flagellum not longer than the third. 

 Mandibles wholly black. Thorax covered with long hairs; the prothorax, 

 disk of mesothorax, scutellum, and enclosure of metathorax, bare. 

 Mesothorax rather dull, with large, rather sparse punctures. Scutellum 

 shiny, with sparse punctures ; a small impunctate space on each side of the 

 middle. Enclosure of metathorax dull, minutely roughened, bounded 

 only by an impressed line. TeguU^ shining dark brown. Wings hyaline, 

 iridescent, nervures and stigma testaceous, costal nervure black. Second 



