300 



refer to tlie IT-year Brood YIII. while the year 1859 eau only he referred, to our 

 Brood XI. 



Indiana. — Couuties of Sullivan and Knox. To these is prohahly 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 1859." There is some doubt about these localities in extreme southwest- 

 ern Indiana, for they come very close to the r'^gion known to be occupied by the 

 17-year Brood YII, which appeared in 1859. 



Illinois. — About Alton, Madison County. 



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

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

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

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

 mine which was one of the earliest set out here (in 1857)." The second communiv^'a- 

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

 ter part 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 cxuite delinite aud 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 irom the eastern forest region by a long stretch of open 

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

 viz, the late Mr. V. T. Chambers (see Amer. Entom., iii, p. 77). Still we can not 

 refrain from suspecting a confusion with some other sj)ecies of Cicada. 



FURTHER NOTES ON YUCCA INSECTS AND YUCCA POLLINATION.* 



By C. V. Riley, Ph. D. 

 PRONUBA MACULATA. 



Since the preseutation a year ago of the commuuicatiou on " Some 

 Interrelations of Plants and Insects,'' in which I summarized what was 

 then known of Yucca pollination and the Yucca moths, some fiu^ther 

 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. Yii, pp. 81-104)- 

 On account of the singular structure of Yucca whipplei, which was known 

 to be pollinated by Fronuha maculaia^ I was quite anxious to obtain the 

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

 abundant pollen, and the i)eltate stigma, are characters which would 

 seem to facilitate ordinary pollination, though the restricted style would 

 render this more dif&cult and the i)eculiarities of Fronuha maculata 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 Yucca 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, which arises directly from a crown of 



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



