PUPOIDES. 119 



No "live" specimens have been seen; those from South 

 Dakota and Las Vegas, though sometimes retaining the cinna- 

 mon color, may be Pleistocene or later fossils washed into the 

 streams. Apparently it still lives in Colorado, as the Pike's 

 Peak shells are quite fresh. By correspondence with Junius 

 Henderson and the examination of specimens it appears that 

 all published Colorado records for hordaceus were based on 

 specimens of inornatus, with the possible exception of Samp- 

 son's Williams canyon record (Nautilus, vi, 102), which has 

 not been re-examined. The true P. hordaceus is known to 

 occur only in the extreme southwestern part of the state, west 

 of the Rocky Mountains. 



Professor Cockerell seems to have been the first to find this 

 shell, but unfortunately he described it quite briefly, without 

 mention of the sculpture, and used a preoccupied name. I 



ve not seen his P. a. var. saxicola, but it is now regarded 

 y him as identical with inornatus. Later Mr. Vanatta, who 

 had access to large numbers of the true P. .hordaceus, noticed 

 the difference in sculpture. 



6. PUPOIDES CHORDATUS (Pfeiffer). PL 11, figs. 14, 15. 



Shell rimate, cylindric-oblong, thin, sculptured with ob- 

 lique, rather distant, cord-like riblets, pellucid, corneous. 

 Spire long, the apex obtuse. Whorls 5%, moderately convex, 

 the last slightly over one-fourth the length, rounded at base. 

 Aperture oblique, oval; peristome white-lipped, shortly ex- 

 panded throughout, the margins somewhat approaching, colu- 

 mellar margin slightly arcuate. Length 4, diam. 1 mm. ; aper- 

 ture slightly more than 1 mm. long (Pfr.). 



Mexico: Mazatlan (E. Klocke). 



Bulimus chordatus PFR., Malak. Blatter, iii, 1856, p. 46; 

 Monogr. Hel. Viv., iv, p. 420; Novit. Conch.., iii, p. 440, pi. 

 94, f. 3-6. Pupa chordata Pfr., BINNEY & BLAND, Land and 

 Freshwater Shells of N. A., i, 1869, p. 241, f. 418. Pupoides 

 ch-ordatus Pfr., MARTENS, Biologia Centrali-Americana, Moll., 

 p. 330. KOBELT, Conchyl.-Cab., Buliminida, p. 921, pi. 130, 

 f. 5, 6. Pupa choroata SCHAUFUSS in Paetel's Cat., p. 84. 



More delicate and more tapering than P. hordaceus, the 



