NEW INSECTS FROM ARIZONA, ETC. 63 



as long ; clypeus (except the usual dots, which are very near the 

 margin) and lateral face-marks dull white, the latter triangular, with 

 the upper angle on the orbital margin about on a level with the 

 antennal sockets ; no supraclypeal or dog-ear marks ; antennae dark 

 brown above (yellowish brown towards the tips), yellowish beneath; 

 vertex minutely granular, but still shiny; mesothorax shining, sparsely 

 punctured, rather hairy ; tubercles, and two transverse marks on hind 

 border of prothorax, white ; wings opaline, nervures colourless, stigma 

 faintly yellowish, marginal cell moderately long, nearly squarely 

 truncate ; second submargiual large, narrowed at least one-half to 

 marginal ; third discoidal distinct. Femora black, knees light ; tibiae 

 (very hairy) dark brown or black, anterior tibiae cream-colour in front ; 

 tarsi yellowish white. Abdomen broad and flat, very dark brown, with 

 straight yellowish white bands at extreme bases of segments 2 to 4, 

 each band with a linear median interruption, the bands all abruptly 

 ending some distance before the lateral margins. The band on the 

 fourth segment is absent in one specimen. Tip of abdomen hairy, 

 pygidial plate long, orange-brown ; venter dark brown, the margins of 

 the segments hyaline. 



<? . Like the female, but there is a minute supraclypeal mark, and 

 the abdomen is hardly so dark, while the bands are browner and less 

 well defined. 



Hah. At flowers of Heterotheca subaxillaris, three females, 

 one male, Tempe, Ariz., October, and Phoenix, Ariz., Oct. 15th, 

 1899 (CklL). At both places, and on the same flowers, I also 

 took P. astei-is, Ckll. 



P. JieterothecfB (?) is very like P. icpiota, Ckll., but differs in 

 the shape of the lateral face-marks, and the second submarginal 

 cell less narrowed above. 



Perdita heliotropii, sp. n. 



? . Length about Ah millim. ; head and thorax dark brassy green; 

 abdomen lemon-yellow, with four broad entire dark-brown bands. 

 Head ordinary ; face almost free from hair, but a good deal of hair above 

 the antenna; labial palpi, with the last three joints together some- 

 what more than half the length of the first ; vertex strongly granular ; 

 labrum dark brown ; clypeus, two spots representing the supraclypeal 

 mark, and lateral marks, pale lemon-yellow ; no dog-ear marks ; clypeus 

 with the usual dots, and also two brown spots on its upper portion ; 

 lateral face-marks narrow, tapering to a point a little above the level 

 of the antennal sockets, slightly angulate a little before the point ; 

 cheeks wholly dark ; antennae dark brown above, yellow beneath ; 

 mesothorax shining, with scattered punctures and sparse hairs ; 

 tubercles, and both borders of prothorax anteriorly, lemon-yellow ; 

 nervures and stigma very pale brown ; marginal cell nearly squarely 

 truncate ; third discoidal distinct ; femora black, with yellow apices ; 

 front and middle tibi^ and tarsi yellow ; hind tibiae and tarsi dark 

 brown ; venter of abdomen yellow. 



(? . Length 4 millim. ; labrum yellow ; clypeus yellow, without 

 the two brown spots ; supraclypeal mark transversely hour-glass- 



