1896.] NATURAL SCIENCES OF PHILADELPHIA. 97 



margin not produced into spines. Face-markings dull sulphur-yel- 

 low. Clypeus with a yellow longitudinal band, uniting with the 

 broadly yellow anterior portion — or one might say, clypeus yellow 

 with a pair of large triangular dark patches, the triangles having 

 one side coincident with the hind margin. The extreme anterior 

 edge of the clypeus is bordered with a black line. The supracly- 

 peal mark is represented by a pair of squarish yellow patches ; the 

 dog-ear marks, on each side of these, are not much larger. The 

 lateral yellow face-marks would form nearly equilateral triangles, 

 but that the innermost angle is narrowly produced. The upper 

 angle scarcely reaches the level of the antennal sockets. 



Thorax not very shiny, the surface granular. No pale markings. 

 Prothorax with prominent shoulders. Color of thorax black with a 

 slight metallic tinge, becoming distinctly brassy-green on anterior 

 half of mesothorax ; metathorax blue-black. Pleura and sides of 

 metathorax with white hairs ; mesothorax with sparse hairs. Teg- 

 ul?e hyaline subtestaceous. Wings milky-hyaline, nervures (except 

 the dark costal nervure) practically colorless ; stigma very pale yel- 

 lowish. jNIarginal cell obliquely truncate, substigmatal portion a lit- 

 tle the longer. Second subnjarginal narrowed hardly one-half to 

 marginal, third discoidal excessively weak. 



Legs shining black, with white hairs. Anterior coxoe with a very 

 noticeable tuft of white hairs. Tarsi becoming brownish. Ante- 

 rior knees, and anterior tibiie in front, yellow. 



Abdomen oval, shining piceous without light markings. Mar- 

 gins of the segments a little rufescent. Venter brown. 



Hab. — Las Cruces, N. M., on Solidago canadensis, 8ept. 3, 1895, 

 one specimen (Ckll., 4,746). It was associated on the flowers with 

 Melecta maculata, Anthophora maculifrons, Perdita semicrocea, Col- 

 ietes, Heriades, Prosojns 2 spp., Oxyhelus 2 spp., Fhilanthus and 

 Odynerxis. 



61. Perdita crassiceps n. sp. Fig. 15 (head.) 



S . — 6 mm. long. Smooth and shiny ; head and thorax so dark 

 green as to seem black, metathorax very dark blue. Head quad- 

 rate, extremely large, eyes comparatively small and narrow. Ver- 

 tex minutely granular, but nevertheless shining, with a transverse 

 ridge behind the ocelli. The punctuation is sparse. Cheeks un- 

 armed ; mandibles rather long, scimitar-shaped, blunt at tips, 

 pale yellowish becoming rufescent distally, the tips blackish. An- 

 tennae dark brown above, yellow beneath. Clypeus wholly pale 



