240 Journal New York Entomological Society. [VoI. xxiii, 



narrow and rounded in marginata. But the greatest differences are in the 

 lower pieces into which the uncus locks, which are s millimeters long in cultri- 

 formis, and when seen in profile are shaped like the blade of a pruning knife, 

 hence the name. In Cicada marginata these same pieces are about 2.5 milli- 

 meters in length and not shaped at all like those of ciiltriformisA The costal 

 margin of the fore wing in cultriformis is evenly rounded and not so suddenly 

 bent as in marginata, and the opercula, which are broadly rounded at the 

 extremities in both species, are larger. 



Allotype, female ; bears the same date as the type. It is in the author's 

 collection. 



It has the same large, conspicuous black spot on the pronotum as the type, 

 and the two central, large, pipe-shaped spots on the mesonotum are as well 

 defined and of the same shape. The specimen was killed before it was mature 

 and before its colors had completely developed. 



Measurements (in Millimeters). 



Male Type. Female Allotype. 



Length of body 40 38 



Width of head across eyes 16 17.5 



Expanse of fore wings no 125 



Greatest width of fore wing 17 19 



Greatest width of operculum 9 



The species here described is one of our largest cicadas, and while 

 it may be readily distinguished from its nearest known allies by its 

 peculiar genitalia, we think that the large, black spot on the prono- 

 tum will also prove of specific value.- The outer lines of the bowls of 

 the pipes in the pipe-shaped spots on the mesonotum, run parallel in 

 Cicada cultriformis both in the type and the allotype, which they do 

 not do in Haldeman's figure of Cicada rcsh and in about two hundred 

 specimens that we have identified as that species from Texas and 

 Oklahoma. The markings of Cicada rcsh differ in other respects, and 

 it is also a much smaller insect. 



As the figure of Cicada marginata Say published in this Journal 

 for March, 191 5 (Vol. XXIII, PI. 2, fig. i) was not quite satisfactory, 

 we herewith present a second one. The insect from which it was taken 



1 By coloring them white Mr. H. H. Cleaves brought out the dift'erences 

 more clearly in the photographs from which the figures were made. 



2 Since the above description was written a female Cicada cultriformis from 

 Verde Valley, Arizona, August i, 1913, A. W. Murrill collector, (Collection 

 U. S. Nat. Museum), and a male labeled " Arizona " in the Uhler collection, 

 U. S. Nat. Museum, have been examined. In size and markings they closely 

 resemble the type and allotype as described. 



