FURTHER STUDIES OF YUCCAS. 205 



Arizona, where data assumes much larger proportions, 

 though it bloomed very freely this year, I did not suc- 

 ceed in finding any of the moths in a day-light search in 

 the early part of June, just as the species was coming into 

 bloom, nor were many ripening capsules to be found when 

 I again visited this locality toward the end of the month. 

 But the few fruits which had set showed the usual Pro- 

 nuba deformity, and a considerable number of last year's 

 capsules were found, all containing the remains of tunneled 

 seeds, and perforated by the escaped larvae. 



Y. olacca, Eraser, Cat. 1813, not Sims. (Y. angusti- 

 folia, Pursh, 1814, and most recent writers).* — It has long 

 been known that the pollinator of this representative Rocky 

 Mountain species is Pronuba yuccasella, which appears 

 coetancously with its flowers in the west and southwest, 

 but,beinjr more closelv connected in the east with the later- 

 blooming filamentosa, only exceptionally appears early 

 enough to pollinate even the latest blooming flowers of 

 glauca on plants cultivated in Washington and St. Louis f 

 (where a few capsules were again matured in the sum- 

 mer of 1891). The only observations on the behavior of 

 the moth on wild plants that I know of are those reported 

 by the writer in 1891 from the vicinity of Manitou, Col 4 

 Incomplete as these are, they show that her actions are 

 quite the same as on jilamentosa.§ 



* Though for reasons of expediency it would be better to preserve for 

 this plant the name of angustifolia, under which it is universally known, 

 the short description in Fraser's Catalogue is sufficiently characteristic, in 

 connection with the northern locality from which his specimens were 

 obtained, to make it necessary to restore his name. The later Y. glauca, 

 Sims, is an entire-leaved plant which I should refer to filamentosa. 



f Riley, I. c. 116, 121, 128. X See Riley, I. c. 124. 



§ The principal references under this species are as follows: Bruner, 

 Entomol. Bull. U. S. Dept. Agriculture, ii. 9. Meehan, Bull. Tor- 

 rey Bot. Club, iv. 63; Proc. Phila. Acad. 1873, 414; Proc. Amer. Ass. 

 Adv. Sci. xxx. 205; Amer. Nat. 1881, 807; Proc. Phila. Acad. 1888, 275, 

 general abstracts in Proc. Amer. Ass. xxxvii. 284 and Bot. Gaz. 1888, 

 237. Riley, Trans. St. Louis Acad. iii. 570; Mo. Ent. Rept. v. 159; Insect 

 Life, i. 368; Rept. Mo. Bot. Gard. iii. various places. 



