140 SOUTHERN CALIFORNIA ACADEMY OF SCIENCES. 



Hab. — Near Los Angeles, Calif., (Dr. A. Davidson). 

 The male oi Heriades differ in the structure of the apex of the 

 abdomen. Thus H. florisomnois (ly. ) has two truncate processes; 

 H. cafripanularmn (Kirby) has two long pointed processes; 

 H. nigricornis, Nyl. has the end of the abdomen broadly trun- 

 cate, without process; H. Odontiira, n. sp., has three processes. 



Halictoides davidsoni, n. sp. 



Male. — Length lo mm., slender; black, vertex with a 

 bluish, mesothorax with a greenish tint; head and thorax 

 clothed, not very densely, witti long erect hairs, white on cheeks 

 and pleura (very long on cheeks beneath), greyish and blackish on 

 thorax above, black at sides of face; clypeus densely covered with 

 long white hairs; scape slightly swollen, clothed with long black 

 hairs; flagellum long faintly tinged with ferruginous beneath, 

 head broad, eyes prominent; mandibles thickened about the 

 middle, black, ending in two bright ferruginous teeth, the lower 

 one much the longest; from the lower side of each mandible near 

 the middle proceeds a very long curled tuft of pale orange hair; 

 mesathorax with large close punctures, basal area of metathorax 

 well-defined, strongly longitudinally striated; tegulse shining 

 very dark-brown; wings yellowish, nervures and stigma piceous; 

 legs ordinary, black, with long white hair, middle femora swollen; 

 abdomen narrow, closely punctured, clothed with short erect 

 dull white hair; extreme apex ferruginous; apical vental seg- 

 ment terminating in two sharp teeth; vental surface shining, 

 with ver}^ little hair. 



Hab. — One from Dr. A. Davidson, from Bear Valley, 

 San Gabriel Mts. Closely allied to H. mtilleri, Ckll., 1898, 

 which was described from a female. It seems hardly likely that 

 H. davidsoni is the male of mulleri, as the latter has the first 

 recurrent nervure entering the second submarginal cell very near 

 its base, whereas in H. davidsoni it enters a considerable distance 

 from the base as in H. marginahis. 



Halictoides (EpiJialictoides) virgatiis, Ckll., 1898. Southern 

 California. The following notes, based on cotypes; are additional 

 to m}^ original description. 



Male.— Abdomen tufted beneath at apex; fourth ventral 

 segment at sides of hind margin tuberculate. 



Female.— Blade of maxilla 700 (this and the palpal 

 measurements are all in micromillimeters); joints af palpi min- 

 utely scaly; length of palpal joints, (A.) Labial palpi, (i) 380, 



(2) 340, (3) 220, (4) 190; (B.) Maxillary palpi, (i) 270, (2) 310, 



(3) 260, (4) 210, (5) 210, (6) 200. 



