76 



PSYCHE 



[April 



occidentalis Ci". 

 superbus Prov. 

 californicus Cr. 

 faceatus Prov. 



Triepeolus Rob. 

 concaviis (Cr.). 



Melecta Latr. 

 califoriiica Cr. 



Zacosmia Ashm. 

 maculata (Cr.), San Pedro. 



BOMBOMELECTA Patt. 



edwardsii (Cr.). 

 separata (Cr.). 

 thoracica (Cr.). 



Stelis Panz. 



laticincta Cr. 

 sexmaculata Ashm. 



OsMiA Panz. 



californica Cr. 

 cobaltina Cr. 

 maura Cr. 

 quadriceps Cr. 

 exigua Cr. 

 atriventris Cr. 

 dubia Cr. 

 purpurea Cr. 

 lignaria Say. 

 nigrifrons Cr. 

 brevis Cr. 

 albiventris Cr. 



rustica "Cr." Fowler (Robertson says that 

 rustica is identical with albix>entris). 



MoNUMETHA Cr. (genus hardly distinct from 

 Osmia). 



imperfecta Prov. 



Heriades Spin. 



odontura Ckll., near Los Angeles, 

 iilaucmn Fowler. 



albicinctum Prov., probably an As/imeadiclla. 

 semirnbra Ckll., not a true Heriades. 



Ashmeadiella Ckll. 



californica (Ashm.), described imder Chalico- 

 doma. 



Alcidamea Cr. 



uvulalis Ckll., Mojave Desert, 

 simplex (Cr.) [producta Cr.). 



Androxicus Cr. 



hesperius Ckll., sp. nov. $ . About 12 mm. 

 long, black, closely punctured; wings 

 smoky; flagellun brown beneath; tarsi with 

 short reddish hair. Clypeus with the ante- 

 rior border thickened and faintly concave; 

 scape stout ; flagellum like that of Alcida- 

 mea, but not hooked at the tip ; first ven- 

 tral segment of abdomen produced into a 

 backwardly directed spine at the middle of 

 its posterior margin ; seventh dorsal seg- 

 ment subtruncate with rounded edges. 

 Rock Creek, Mojave Desert. 



Chelostoma Latr. 



californicum Cr. 



australe Ckll., near Los Angeles. 



x\nthidium Fabr. 



atriventre Cr. 



emarginatum Say. 



maculosum Cr. 



tricuspidum Prov. 



collectum Huard [compnctum Prov.). 



californicum Cr. 



edwardsii Cr. 



palliventre Cr. 



illustre Cr. 



maculifrons (Sm.?), Fowler. 



DiANTHIDIUM Ckll. 



consimile (Ashm.). 



ehrhorni (Ckll.), Mojave Desert. 



Megachile Latr. 



occidentalis leucotricha Ckll., near Los 

 Angeles. 



