256 BOARD OF AGEICULTUEE. 



(Cicada septemdecim) and the dog-day cicada (C pruin- 

 osa). Fig. 7, copied from Riley's report, gives a good idea 

 of this species; a represents the pnpa ; 5, tlie same after the 

 adult has escaped through the rent in the back ; c, the winged 

 fly ; d, the holes in which the eggs e are inserted. Fig. 8 rep- 

 resents the larva as soon as hatched. The adult may be 

 known by its rather narrow head, the black body and bright- 

 red veins of the wings. The wings expand from two and a 

 half to three and a quarter iuches. 



The pupa is long and narrow, and compared with that of C, 

 pruinosa, the head is longer and narrower, the antennae consid- 

 erably longer, the separate joints being longer than those of 

 the dog-day locust. The anterior thighs (femora) are very 

 large and swollen, smaller than in C. pruinosa, though not 

 quite so thick, with the basal spine shorter than in that species, 

 while the snag or supplementary tooth is larger and nearer 

 the end; the next spine, the basal one of the 

 series of five, is three times as large as the next 

 one, while in O. pruinosa it is of the same size, 

 or if anything smaller. The toe-joint (tarsus) 

 projects over two-thirds of its length beyond the 

 end of the shank (til)ia) , while in the other spe- 

 cies it only projects half its length. The termi- 

 nal segment of the body is rather larger than in 

 C. pruinosa. The body is shining gum-color or 

 honey-yellow, with the hinder edge of the ab- 

 Fig. 8.- Larva of domiual scgnieuts thickened, but no darker than 

 cka^daf '^"'^'^'''^ the rest of the body. Length one inch (.90-1), 

 width about a third of an inch (.35) being rather smaller than 

 that of O. pruinosa and much larger than that of O. rimosa. 



The dog-day harvest-fly (fig. 9, from Harris's Treatise), 

 may at once be known by its large head, as wide as the body, 

 and by the green markings on the head and thorax, especially 

 the AV-shaped mark on the latter. It expands three inches, 

 and is a larger and more bulky insect than the preceding. We 

 know but little of its habits. Harris says that it invariably 

 appears with the beginning of the dog-days, and in the vicin- 

 ity of Boston he has heard it for many years in succession, 

 with only one or two exceptions, on the 25th of July, for the 

 first time in the season. According to Prof. A. E. Verrill, in 



