1895.] NATURAL SCIENCES OF PHILADELPHIA. 17 



College, September. (Ckll., L',405.) Another specimen had previ- 

 ously been taken at Las duces, by Prof. C. H. T. Towusend. 



Mr. Fox writes: "rritidella is new, unless the $ of some known 

 species, which, however, I think unlikely." I do not myself enter- 

 tain any serious doubts as to the validity of the species. 



Perdita canina n. sp. &. 



About 5 mm. long ; head and* thorax dark metallic-blue, the 

 white pubescence moderately abundant. Crown of head minutely 

 granular, with punctures interspersed, showing that the granulations 

 do not represent minute punctures of the ordinary sort. 



Clypeus yellowish-white, this color extending upwards to level of 

 antennae and there abruptly truncate, with a slight indentation in the 

 middle. On each side this is touched by a heart-shaped spot situated 

 beneath the antenna?, the whole so placed as to suggest the head of 

 a hound, with drooping ears, seen from behind. A minute, black 

 dot on each side of clypeus, as in austini. Besides these markings 

 a narrowing band of yellow borders the eyes in front, coming to a 

 point a little above the level of the antenme. Antenna? yellow be- 

 neath and black above. 



Thorax shiny, sparsely punctured, tegulre pale yellow. 



Abdomen yellow and dark sepia- brown ; 1st segment brown; 2d 

 and 3d segments, with the disc broadly yellow, margined with brown, 

 this margin not covering the sides, which are yellow at the angles. 

 4th segment yellow with its upper margin brown, the brown extend- 

 ing hindward at the sides to about the middle of the segment. 

 Just below this brown margin, medially, is a minute dot of brown. 

 Hind margin of 4th segment narrowly brown, with a squarish brown 

 mark ou each side about half-way between lateral margin and cen- 

 tre. 5th segment yellow, very narrowly margined with brown above 

 at centre, and with a brown spot on each side near lateral margin, 

 and near hind margin a pair of brown marks representing the 

 squarish marks of previous segment. Remaining segments yellow. 

 Abdomen shiny, obscurely punctate. 



Legs yellow marked with black ; anterior femur and tibia each 

 with a black patch behind; middle femur with an oblique black 

 patch behind, middle tibia mostly black, middle tarsus pale brownish. 

 Hind femur with a large elongated black patch above, hind tibia 

 and tarsus blackish. 



