222 West AmcriccW MoUusca. 



pollinosc. Tilii.'i- with the extreme base yellowish; pulvilli very 

 large, whitish. Wings wholly hyaline, small crossvein at or slightly 

 beyond the middle of the discal cell ; tip of second vein curving for- 

 ward and meeting the eosta at an obtuse angle. Halteres brown, 

 the knobs light yellow; in front of each is a dense cluster of white 

 pile. Genitalia consisting of a glol)ular lower piece surmounted by 

 a narrow shield-like ])iece which on either side is prolonged back- 

 ward into two ciuite long and rather broad processes truncated at 

 their tips, the latter curving toward each other. Length 3.5 to 4.5 

 mm. Los Angeles and San Diego counties, Cal. Eight males, in 

 May and June, resting upon the bare ground in the hot sunshine. 



This species will be readily distinguished from the other two 

 described species by the color of the legs, as well as by the rovmded 

 tip of the third antennal joint. D. W. Coquillett. 



CONTRIBUTIONS TO WEST AMERICAN MOLLUSC A. —I. 



In this series of papers it is intended to present in connected 

 form strav notes on the mollusca of the Pacific Coast, with biblio- 

 graphical references, and especial attention to geographical distri- 

 bution. In this first contribution we have to enumerate various 

 new sjK'cics founded by m}^ friend, Dr. R. E. C. Steams, in a paper 

 published in the Proceedings of the United States National Museum 

 (xiii. 205-225), entitled 'Descriptions of new West American land, 

 fresh- water and marine shells, with notes and comments.' 



Hei.ix (Akioxt.\) colokadoensis Stearns, Proc. U. S. Nat. Mus. 

 xiii. 206, pi. XV. figs. 6, 7, 8. Grand canyon of the Colorado, oppo- 

 site the Kailial) plateau, at an elevation of 3,500 feet. Allied to H. 

 remondi. 



Helix (Akioxta) magdalenensis Stearns, 1. c. 208, pi. xv. figs. 

 11,12,13. Magdalena, Sonora, Mexico. Allied to H. rowelli. 



Hoi,ospiRA sEMisciTLPA Steams, 1. c. 208, pi. xv. figs. 1, 4. Near 

 San Carlos, Chihuahua, Mexico. Closely allied to, if not a variety 

 of H. coahuilensis. 



HoLospiKA ARizoNENSis Stcams, 1. c. 208-9, pi. XV. figs. 2, 3. 

 Dos Cabesas, Ainzona. 



Melaxia (?Goniobasis) acutifilosa Stearns, 1. c. 211, pi. xv. 

 fig. 9. Eagle Lake, California, at an altitude of 5,115 feet. 



Cyclothyca Steams, 1. c. 212. New subgenus of Capulus, with 

 C. corrugata for type. 



Cyclothyca corrugata Steams, 1. c. 212, pi. xv. figs. 5, 10. 

 From west coast of Nicaragua. 



