1896.] NATURAL SCIENCES OF PHILADELPHIA. 85 



Small species found on Gutierrezia, 9 unknown. 



44. Perdita austini Ckll., Proc. Phila. Acad., 1895, p. 13. cf • (Hab., Las Cruces, 



N. M.). 



The type was taken in September. The cheeks are unarmed, the 

 mandibles simple, the clypeus of the Panama-hat type, with the 

 crown higher, more like a Puritan's hat. The mesothorax is shiny, 

 it and the face nearly bare; but the cheeks and pleura, as well as 

 the thorax beneath generally, with conspicuous white hairs. The 

 marginal cell is rather long, but the substigmatal portion is notice- 

 ably longer than the poststigmatal ; the second submarginal is nar- 

 rowed nearly to a point above. 



I took one specimen at Albuquerque, N. M., on Gutierrezia saro- 

 thrce, Aug. 15, 1895. At Las Cruces it is quite rare so far as observed. 

 Mr. C. Rhodes took one on Bigelovia wrightii, toward the end of 

 September. I took it on Gutierrezia sarothrce var. microcephala on 

 Sept. 25th. The 9 is unknown. 



45. Perdita gutierrezise n. sp. or variety. 



S . — About 4 mm. long, size and appearance of nitidella S . 

 Cheeks unarmed, but projecting at base of mandibles so as to simu- 

 late a small tooth. Face entirely yellow up to nearly the length of 

 scape above level of insertion of antennte, the yellow enclosing a 

 black spot on each side at its extreme upper border close to margin 

 of eye. On each side, midway between the eye and the median line, 

 the yellow is depressed by a slight invasion of the blue, which forms 

 thereat an angle considerably greater than a right angle. Lower 

 half of cheeks broadly yellow, pleura with a yellow patch, which is 

 wanting in nitidella; 2d submarginal cell more narrowed above 

 than in nitidella ; 3d discoidal distinct. Veins dark brown. The 

 rest much as in nitidella. 



Hah. — Albuquerque, N. M., one specimen on Gutierrezia saro- 

 thrce, August 15th. This is certainly distinct from nitidella, but it 

 may be only a variety of bigelovice ; see below under macidipes. 



46. Perdita tarda n. sp. 



S . — Length 42 mm. Head and thorax dark blue. Head mod- 

 erately large, distinctly broader than long, cheeks unarmed, vertex 

 rugulose and punctured. Face very free from hairs, except sides 

 near antennie, where they are rather conspicuous ; cheeks thickly 

 clothed with long white hairs. Antennse dark brown above, yel- 

 lowish beneath, the scape all yellow beneath and at base above. 



