420 Messrs. T. D. A. Cockevell and W. Porter on Bees. 



margin ; aiitennse brown, scape and lower part of flagellum 

 dark brown or black ; wings without black tips, clear 

 througliout, apices not quite so produced, marginal cell not so 

 long and narrow ; legs black ; hair at apex of abdomen dirty 

 white. 



Hah. Las Vegas, New Mexico, at flowers of Chamcesaracha 

 coronopus, Aug. 1 to 4 {Ckll. ^ W. Porter). 



Halictoides, Nyl. 



The type of this genus is H. dentiventris. Various species 

 assigned here present considerable structural differences, as 

 follows : — 



(A) Labial palpi with joint 1 longer tlian the 



other three together ; joint 2 not one 

 fonrth the length of 1 ;" abdomen of S 

 toothed at sides beneath. [Halictoides, 

 8- str.) dentiventris, Nyl. 



(B) Labial palpi with joint 1 not nearly so long 



as tlie other three together ; joint 2 about 

 three quarters length of 1 ; galea rather 

 long ; abdomen of c? simple, except that 

 the last ventral segment has a longitu- 

 dinal keel. (EpiMlictoides, subgen. nov.) . marginatus, Cresson. 



(C) Labial palpi with joint 1 rather shorter than 



the other three together; joint 2 about 

 half the length of 1. {Farahalictoides, 

 subgen. nov.). 



(1) Shortest joint of maxillary palpi less than 



half the length of the longest ; joints 1 



and 2 large, the others small Tinsleyi, Ckll. 



(2) Shortest joint of maxillary palpi more than 



half the length of the longest. 



(«) Head in J transversely oblong; abdo- 

 men of (S with a subapical ventral 

 tuft campa7ittles, Ckll. 



(b) Head in (5 longitudinally oblong ; abdo- 

 men of c? without a subapical ventral 

 tuft paradoxus, Moraw. 



H. cawpamdcB may be taken as the type of Parahalictoides. 



Hemihalictus, Ckll. 



Ashmead has referred this to Dufourea^ but the mouth- 

 parts are widely different, as follows : — 



EemihaJictus lustrans (Ckll,). — Tongue short, broad at base; 

 paraglossEe broad, much more than half the length of the 

 tongue ; galea broad and thin, notched within, the apical 

 portion beyond the notch with large bristles ; first joint 



