HEMIPTERA. 183 



published accounts of the occurrence of these insects in the 

 Middle, Southern, and Western States, where, at regular in- 

 tervals of seventeen years, varying according to the locality, 

 they are seen even in greater abundance than in Massachusetts. 

 The following dates and places of their ascent are given in 

 Professor Potter's "Notes on the Locusta decern Septima" 

 [Cicada scplcndcdm) : Maryland, 1749, 1706, 1783, 1800, 1817, 

 1834; South Carolina and Georgia, 1817, 1834; Middlesex 

 County, New Jersey, 1826; Louisiana, 1829; Gallipolis, Ohio, 

 1821, and Muskingum, 1829; western parts of Pennsylvania, 

 1832; Fall River, Massachusetts, 1834. To these may be 

 added from other sources, Pennsylvania, 1715, 1766, 1783, 

 1800, 1817;* Marietta, Ohio, 1795, 1812; Plymouth, 1633, 

 1804; Sandwich, 1787, 1804,1821; Hadley, 1818; Westfield, 

 1835; North Haven, Conn., 1724, 1741, 1758, 1792, 1809, 1826, 

 1843 ; Genesee County, New York, 1832 ; Martha's Vineyard, 

 1833. From information derived from various sources it ap- 

 pears* that this species is widely spread over the country, with 

 the exception only of the northern parts of New England; 

 and that it may be seen in some portion of the United States 

 -^most every year; and, although certain disturbing causes 

 may occasionally accelerate or retard the return of individuals, 

 or even of an entire swarm, in any one place, yet the lineal 

 descendants of one particular family or swarm will ordinarily 



"Medical Repository," p. 71 ; the " Columbian Magazine," vol. 1, pages 86 and 

 108; Mr. Moses Bartram's account in Dodsley's "Annual Register" for 1767, 

 p. 103; Dr. McMurtrie, in the 8th vol. of the "Encyclopaedia Americana," p. 

 43 ; Dr. S. P. Hildrcth's interesting account in the 10th vol. of Silliman's 

 "American Journal of Science," p. 327; and a pamphlet entitled "Notes on 

 the Locusta," Sec, with which I have been favored by the author. Professor 

 Nathaniel Potter, of Ealtimore. This last work is exclusively devoted to the 

 history of this insect, and has afforded me much valuable information. From 

 these various sources I have selected the principal facts which follow. Mr. 

 CoUins's "Observations on the Cicada of North America," published in the 

 " Philosophical Transactions" of London, vol. 54, p. 65, with a plate, probably 

 refer to the seventeen-year Cicada, but the insects figured are not the same, and 

 seem to be the Cicada pruinosa of Mr. Say. 



* A writer in the "United States Gazette " records the appearance of these 

 insects in great numbers in Gcrmantown, Pennsylvania, on the 25tk of May, at 

 four successive periods. 



