REE.ORT OF ASSISTANT DIRECTOR OF NATIONAL MUSEUM. 121 



Riley, Charles V. — Locusts and Locusts. A letter from Professor 0. 

 V. Riley. The Lead of the Uuited States Eutomological Commis- 

 sion explains the difference between the periodical Cicada and the 

 true Locust : thirteen- and seventeen-year broods : no especial cause 

 for alarm this year. 



(New York Tribune, June 22, 1881.) 



Popular confusion of insects having very different habits under the term 

 '* locust." Comparative account of Cicada septemdecim with Caloptenus spretus. 

 No cause for the alarm as to true locust depredations. Recommendation of a 

 system of observations and warnings by the Government. 



The Rocky Mountain Locust, alias Western Grasshopper. 



(American Agriculturist, July, 1881, vol. xl, p. 283, 284, fig. 1-G.) 



Popular condensed statement of habits and remedies for Caloptenua spretus. 



A remarkable case of retarded development. 



(Scientific American, Aug. 20, 1881.) 



Preservation of eggs of Caloptenus spretus unhatched for more than four 

 years by their burial in a cool, moist and almost air-tight place, at Manhat- 

 tan, Kansas, 187C-1>81 ; influence of temperature on acceleration and retar- 

 dation of development. 



The Rocky Mountain Locust, alias Western Grasshopper. 



(Ame*. Agriculturist, July, 1881, Fig. 1-6.) 



Dimorphism in Cynipidx. 



(Amer. Naturalist, July, 1881, xv, p. 566.) 



Claim of priority in proof of dimorphism in Cynipidce in N. A. ; reference to 

 previous views of Walsh and Bassett ; extract from H. Adler's "tlber den 

 Generationswechsel der Eichen-Gallwespen" (Zeitschr. fiir wiss. Zool., Feb., 

 1881, Bd. 35, p. 151 — ), comprising a list of the* 19 specimens in which the 

 occurrence of dimorphic forms has been proven. 



Blepharoceridw. 



(Amer. Naturalist, July, 1881, xy-, p. 567-568.) 



Account of various investigations into the natural history of Blepharoceridoe ; 

 description of the larvae and pupaj. 



The cultivation of Pyrethrum and manufacture of the pow- 

 der. 



(Amer. Naturalist, July, Sept., and Oct., 1881, pp. 569-572; pp. 744-746; and 

 pp. 817-819.) 



Covering of egg-puncture mistaken for Dorthesia. 



(Amer. Naturalist, July, 1881, xv, p. 574.) 



In the collection of Asa Fitch the white and ribbed waxy material cover- 

 ing the egg-punctures of Enehophi/Uum hinotatwm are labeled as Dorthesia 

 vihirni and D. celastri. It is doubtful whether any such species were de- 

 scribed by Fitch. 



Supposed Army-worm in ]!»J'ew York and other Eastern States. 



(Amer. Naturalist, Jtily, 1881, xv, pp. 574-577.) 



Ravages of Xe2)helodes violans and Crambus vuh/irageJhis, in Now Jersey, 

 Long Island, and Northern New York — natural history, vernacular name, and 

 detailed description of larva of the former species. 



