72 SOUTHERN CALIFORNIA ACADEMY 01 SCIENCES. 



Chrysodomus griseus Dall. 



This is anoliier of the "Albatross Molhisca" and Dr. 

 Dall's description can easily be followed Avith the shell before 

 me. 



Shell thin, rather acutely pointed when perfect;" seven 

 or eight whorled; the substratum, pillar, throat milk white 

 and smooth ; nucleus eroded, small round ; suture distinct ; 

 whorls full and rounded; transverse sculpture twenty or more 

 arcuated wave-like ribs, which on the earlier whorls often 

 reach from suture to suture but are strongest on the periphery. 

 As the shells do not hold to the same relative proportions of 

 latitude and longitude, the more elongate the specimen the 

 fainter is the sculpture. 



Found in company with B. aphelus Dall in the Pliocene of 

 Santa Monica Range, Los Angeles Co., Cal. 



One specimen perfect, tM'o nearly so and several more 

 or less fragmental. 



The Bees of Southern California. IV. 



BY T. D. A. COCKERELI.. 



Anthidium saxorum, n. sp. 



Male; length about 11 mm.; pubescence white, faintly tinged 

 with ochreous dorsally, abundant on head and thorax, but 

 not concealing clypeus ; clypeus, lateral face-marks, man- 

 dibles except tips, stripe on scape, and small spot above 

 each eye, pale chrome yellow ; mandibles Avitli only one 

 large toOth; flagellum black; thorax all black except tu- 

 bercles and two marks on scutellum, which are yellow; 

 tegulae with a large yellow spot in front, and a small one 

 behind ; wings fairly clear ; femora black, with a small 

 apical yellow spot on the middle and hind ones ; tibiae with 

 a broad yellow stripe on the outer side, which sends a pro- 

 cess to the anterior side apically; basal joint of tarsi yel- 

 low; abdomen unusually smooth and shining, the bands 

 deep orange ; band on first segment broken into four spots, 

 those in the middle small and transversely elongated; 

 bands on second to fifth emarginate medially and laterally, 

 but not broken ; sixth nearly all orange ; seventh with only 

 two yellow spots ; lateral apical lobes broad and not much 

 produced, very much as in A. mormonum, except that they 

 are less curved inward; venter reddish-black. 



Hab. — Rock Creek, California, one collected by Dr. Davidson. 

 By the cariniform tubercles, white pubesence, etc., this re- 

 sembles A. mormonum, but it differs by having no basal 

 spots on scutellum, bands on abdomen not interrupted 

 medially, &c. 



