300 



refer to the IT-year lirood V'lll, while the yeiir 18r>;i can only l>e referred to our 

 Brood XI. 



Indiana. — Comities of Sullivan and Knox. To these is probably to be added Posey 

 and adjacent counties, since Mr. J.B.Elliott, of New Harmony, wrote us in 1885: 

 *'The Cicada appeared in great numbers over the whole of this (Posey) and adjacent 

 counties in 18.59." There is some doubt about these localities in extreme southwest- 

 ern Indiana, for they come very close to the region known to be occupied by the 

 17-year Brood VII, which appeared in 1859. 



Tlliuoiii. — About Alton, Madison County. 



Kansas. — From this State, which was hitherto not included in the region occupied 

 by this Brood XI, we received in 1885 the following statements, the first from Mr. 

 E. M. McKinnon. Leavenworth, Leavenworth County, being as follows: "The only 

 locusts I ever saw here appeared in 1859, and they destroyed a young orchard of 

 mine which Avas one of the earliest set out here (in 18.57)." The second communica- 

 tion is from Mr. John W. Robsou, of Cheever, Dickinson County : " During the lat- 

 ter i)art of May, 1876, the Cicadas appeared in large numbers along the banks of the 

 Smoky Hill River. They were so noisy and so numerous that the majority of the 

 settlers were alarmed for the safety of their crops. These fears in some measure 

 were allayed by two articles which I published in the county press." Both state- 

 ments are quite definite and can only be referred to this Brood XI. Thus the coun- 

 ties of Leavenworth and Dickinson, Kans., have to be added to our list. 



Colorado. — Cheyenne Canyon. We would have no hesitation in rejecting this lo- 

 cality, which is separated from the eastern forest region by a long stretch of open 

 prairie land, if it were not based upon the authority of an experienced entomologist, 

 viz, the late ]\Ir. V. T. Chambers (see Anier. Entoni., iii. p. 77). Still we can not 

 refrain from snsi)e(ting a confusion with some otlier species of Ci(;adii. 



FURTHER NOTES ON YUCCA INSECTS AND YUCCA POLLINATION.* 



By C. V. Kii.KV. I'll. I). 

 PRONUBA MACTLATA. 



Since the preseiitatiou a. year ago of the comumuication on "Some 

 Interrelation .s of Phmts and Insects," in which 1 summarized, what was 

 then known of Yucca pollination and the Yucca moths, some further 

 interesting observations have been made, and the facts which I have to 

 present tonight should be looked upon as additional to those set forth 

 in the previous paper (Proc, Biol. Soc, Washington, vol. vii, pp. 81-104)- 

 On account of the singular structure of Yucca ichippUij which was known 

 to be i>ollinated by Pronnha macv-lata, I was quite anxious to obtain the 

 facts in reference to this species. The long stamens, the sticky and 

 abundant i)ollen, and the peltate stigma, are characters which would 

 seem to facilitate ordinary pollination, though the restricted style would 

 render this more difficult and the i^eculiarities of Pronnha macnlata with 

 its modified tongue, and maxillary tentacles very long and attenuated at 

 tip, were, I felt quite sure, special adaptations to fit it for its work. 

 This Y^ucca is not only one of the most interesting from the structure 

 of its flower, but is one of the noblest of the cespitose species and 

 placed in the subgenus Hesperoyucca. The flowers are borne in 

 immense panicles on a stalk, Avhich arises directly trom a crown of 



* Read before the Biological Society of Washington, May 20, 1893. 



