118 Tin: NAiTius. 



Some .species and ^roujis are omitted here, although I have received 

 highly valuable materials of tliera, partly because they need being 

 .studied further, partly as 1 intend to treat them separately. 



Pupa fallaz Say. 



This species has been collected, in ty})ical form, on Curacao 

 (Mazyck Collj, a fact which may prove, that P. modica (xld. is not 

 only a southern form of falhix. 



Pupa arizonensis. 



The shells sent out under this name by Gabb, or at least most of 

 them, are known to be nothing else than P. fallax, e. g., those in 

 Smithsonian Inst. Coll., in Coll. of the Acad, of Philadelphia. When 

 I found nothing else, in several of the richer private collections, I also 

 began thinking that P. arizonensis was nothingel.se than a synonym 

 of fallax, in spite of the description and even more the figure in 

 Binney's work, which seemed to point to .something of another kind. 

 But since I have seen the (only) type specimen of that fig. in B. & 

 B. Coll. (Central Park Mus., !N^. Y.), I know that there is really 

 such a thing as P. arizonensis existing. The specimen is somewhat 

 weathered, somewhat grayish- white, the epiconch lost — so that the 

 original color cannot be determined exactly — but otherwise in 

 good condition. It is best compared with P. cortlcaria, of the same 

 .shape, but larger (alt. 3, o m.), has no trace of lamellse, and a thick- 

 ened lip. Now, a short time ago, I received, by the kindness of Mr. 

 L. B. Elliott, of Iowa City, a few examples of this same species. They 

 had been collected, as Mr. E. writes, " at Siligman, Arizona, by an 

 entomological friend, in the nests of large and fierce ants, used as 

 materials to build the nests." They were also somewhat weathered, 

 but fair. And again ]Mr. Elliott sent me a number of Pupidae, 

 collected at Albuquerque, New Mexico, highly valuable things, 

 among which there were 2 examples of our species, in the same 

 condition. One of the Arizona specimens still bears its epiconch 

 and the color is a pale horn ; all have rather fine, remote, rib-like 

 strife, more crowded near the aperture. 



A controversy may arise about the name : Whether Gabb has seen 

 this shell, is not sure, but very, improbable ; his own description' — 

 not to speak of the originals mentioned above — doubtless refers not 

 to this species, but a form of P. fallax, not differing even as a var. from 

 the type. On the other hand there is no doubt but that the descrip- 



1 7 Am Journ. Conch. II, p. 331, Oct. 1, 1866, pi. 21, f. 6. 



