18 PROCEEDINGS OF THE ACADEMY OF [1895. 



Wings hyaline, veins dark brown, stigma margined with brown, 

 3d discoidal very weak. 



Abdomen beneath yellow, the anterior margins of the segments 

 narrowly black. 



Hab.— Santa Fe, N. M. , July 19th. (Ckll., 1,572 and 1,571.) 



Mr. Fox writes: "canina may be the <?of zebrata, although I had 

 previously referred two S specimens, different from yours, to that 

 species. ' ' * 



There was taken, however, at Santa Fe (Ckll., 1,270, July 5th) 

 a specimen of which Mr. Fox writes: "No. 1,270 I had named as 

 P. albipennis, but I now find it differs from that species and is per- 

 haps the $ of canina." 



This example differs principally from canina ( $ ) by the face mark- 

 ings being white; the clypeus not entirely pale, but with the pale color 

 terminating on its upper half in three projections; the yellowish above 

 the clypeus represented by a pair of oval, white marks; the dog's-ear- 

 like marks absent ; the 1st segment of abdomen with a narrow in- 

 terrupted band, the bands on the other segments continuous in the 

 middle ; antennae darker; size larger. 



I think this is a distinct (and new) species, but it may be wiser to 

 leave it unnamed until its relationship with canina can be made 

 clearer. In P. albipennis, the sexes differ very much in the colora- 

 tion of the abdomen, but I find the face markings practically the 

 same in $ and 9 . Hence it seems likely that the dog's- head 

 markings are characteristic of canina in either sex. In its face mark- 

 ings, this 9 form is intermediate between canina and albipennis, but 

 quite different from both. 



Perdita foxi n. sp. j 1 . 



About 5 mm. long or slightly more ; head and thorax very dark 

 blue; face mostly yellow. Abdomen black. Legs rufous. The 

 white pubescence reduced to a minimum, though sufficiently evident, 

 if scattered, on the posterior tibia; and tip of abdomen. 



Head almost exactly circular; vertex finely roughened, clypeus 

 distinctly punctate. Mandibles large, canary-yellow inclining to 

 orange, with piceous tips. Clypeus cpjite prominent, canary-yellow 

 with a black dot on each side. In addition to the clypeus, the wdiole 

 of the face is canary-yellow up to the level of the insertion of the 

 antenme; the yellow at the sides, just before the eyes, extending still 

 further upward, in a broad band which is deeply notched at its ex- 



