80 PROCEEDINGS OF THE ACADEMY OF [1896. 



straight, very pale yellowish with rufescent tips. Clypeus rather 

 cocked-hat shape, flattened above, with the sides very rapidly de- 

 scending and the prolongation to the base of mandibles very nar- 

 row. Face below antennae all lemon-yellow, except the usual cly- 

 peal dots. Above the antennre the yellow extends only as a small 

 projection in the median line, and a little along the orbits, so that 

 the upper angle of the yellow with the orbital margin is about 

 50° instead of a right angle. Lower half of the cheeks with a yel- 

 low band along orbital margin. 



Collar and hind margin of prothorax connecting with tubercles 

 but failing in the middle line, yellow. Tegulse hyaline. Wings 

 hyaline, nervures sepia-brown, stigma margined with brown. Mar- 

 ginal cell moderately long, appendiculate, the poststigmatal portion 

 about as long as substigmatal. Second submarginal not narrowing 

 quite one-half to marginal ; 3d discoidal fairly distinct. Legs yel- 

 low, anterior and middle femora and tibice with a black patch be- 

 hind, hind femora and tibiae black with a yellow stripe in front, hind 

 tarsi blackish. 



Abdomen above with about equally broad bands of black and 

 yellow. First segment basally black. The five dark bands are not 

 interrupted, nor joined medially or laterally. Sixth segment with 

 three dark spots. Venter yellow, immaculate. 



Hah. — Las Cruces, N. M., on the College Farm, May 2d, 1895. 

 One specimen collected by A, M. Holt. 



Two species found on willow in the Mesilla Valley, N. M. 



39. Perdita numerata Ckll., Tr. Am. Ent. Soc, 1895, p. 296. ?. (Hab. Las Cruces, 



N. M.). 



One specimen is known, taken on May 2d, associated with P. 

 salicis. It resembles most the 9 of bigelovice, but the stigma is 

 entirely dark and the clypeus has two broad black bars. The mar- 

 ginal cell is short, appendiculate ; the 2d submarginal is large, very 

 broad below, narrowed considerably more than half to marginal. 



40. Perdita salicis n. sp. 



9 . — Length 5 mm. Head and thorax shining dark green ; head 

 bluish-green, mesothorax and scutellum brassy-green, metathorax 

 dark blue. Head rounded, of ordinary size; vertex minutely 

 roughened, cheeks only sparsely hairy ; clypeus except two black 

 dots, the area between clypeus and antennae, and sides of face nar- 

 rowly terminating in an acute point about half the length of the 



