SOUTHERN CALIFORNIA ACADEMY OF SCIENCES. 139 



Cheiostoma australis, n. sp. 



FkmalK. — Length about 9 mm., black; head and thorax, 

 strongly and densely punctured; white pubescence at sides of 

 thorax, on postscutellum, cheeks and sides of face especially, 

 that on sides of face forming conspicuous bands; antennae short, 

 flagellum faintly ferruginous towards end; anterior edge of 

 clypeus with a median stout snout-like projection, keeled above; 

 mandibles large, bidentate; tegulae very dark-brown; wings 

 hyaline, nervures and stigma black; legs black, the hind femora 

 large and bright ferruginous, the inner side of the hind tibiae 

 also bright ferruginous; base of metathorax with a short longi- 

 tudinally striate area; abdomen ^hining, strongly but only 

 moderately densely punctured; first two segments more or less 

 ferruginous laterally; ventral scopa white. 



Hab. — Near I,os Angeles, (Dr. A. Davidson). Related 

 to Cheiostoma rubifloris (CklL, Can. Ent.. 1898, p. 50, as 

 Chelynia rubifloris .,) but easily distinguished by the color of the 

 legs. 



Alcidamea uvulalis, n. sp. 



Male. — Length about 10 mm., black, with white pube- 

 scence, dense on face and thorax; on abdomen forming narrow 

 bands on the apical margins of segments i to 4, and less distinctly 

 on 5. Head ordinary; e3''es greenish; mandibles black; antennae 

 with the scape greatly swollen, punctured; flagellum broad, 

 dark ferruginous, crenulated above, apical joint pointed; vertex 

 and mesothorax densely punctured; tegulae black; wings yellow- 

 ish; abdomen closely punctured; second ventral segment pro- 

 duced into an immense uvula-like projection; third ventral 

 segment emarginate in the middle; sixth dorsal segment produced 

 into a sharp point at each extreme side; apical segment project- 

 ing, ending in a point which is laterally flattened. 



Hab — Lancaster, Mojave Desert, (Dr. A. Davidson.) 

 A very distinct species. 



Heriades odontura, n. sp. 



Male. — Length about 9 mm., black, narrow in form; head 

 rounded; cheeks with white hair; face and front very densely 

 punctured; flagellum slightly ferruginous beneath, last joint sub- 

 truncate; thorax densely punctured; parapsidal grooves distinct; 

 pleura with short white hair; tegulae shining, piceous, with a 

 large ferruginous spot; wings strongly ferruginous; legs entirely 

 black; abdomen closely punctured, with narrow white hair- 

 bands on apical margins of segments i to 4; second ventral 

 segment produced into a blunt eminence; apical segment ending 

 in three points or teeth, the middle one having at its base a 

 circular depression full ot ochreous pubescence. 



