162 Journal New York Entomological Society. [Vol. xxiii. 



Wakefield, Clay Co., Kans., female (J. C. Warren). Davis col- 

 lection. 



McPherson, Ivans., Aug. lo, 1913, female. Collection Brooklyn 

 Museum, N. Y. 



Chetopa, Labette Co., Kans., July and Aug., 3 males (D. R. 

 Beardslee). Davis collection. 



Mountain Grove, Wright Co., Mo., Aug. 4, 1902, male. Davis 

 collection. 



Mountain Grove, Wright Co., Mo., female. Collection Mo. Agri. 

 Exp. Sta. 



Dallas, Texas, 3 males, i female. Collection Museum Comp. 

 Zoology, Cambridge, Mass. 



In collections there is another cicada usually associated with 

 dorsata, but which is really quite distinct and which we consider to 

 be more of a mountain form of what has been identified as Say's C. 

 marginata (See this Journal for March, 191 5, Vol. XXIII, plate 2). 

 This variety is altogether a whiter insect than true marginata: the 

 color of the prothorax is a much lighter yellow-green, the wings 

 show a tendency to be broader in proportion to their length, and 

 when seen in series the head across the eyes is generally narrower. 



The male genitalia are, however, alike in the two insects, and very 

 dififerent from those of Cicada dorsata as the accompanving figure 

 will show. The prominent line of dorsal white spots has caused its 

 association with dorsata. It will be noted that Say says that the 

 ground color of the tergum in dorsata is black, whereas in marginata 

 and the variety under consideration the segments are yellowish or 

 brownish on their posterior margins. 



It may be described as follows : 



Cicada marginata var. dealbata new variety. 



Type, male, Colorado Springs, Colorado. Davis collection. 



Markings resembling those of C. dorsata, but marginata var. dealbata is 

 more green in color and has less black about the central area of the pronotum. 

 The mesonotum is marked as in dorsata but is more pruinose ; the turgum has 

 a dorsal line of white spots as in dorsata, but the sides are broadly pruinose 

 and the posterior margin of each segment is narrowly edged with greenish 

 yellow. Beneath both insects may be of the same color, though dorsata is 

 usually much darker. The opercula are about as broad as long and broadly 

 rounded at the tips. The fore wings in dorsata are oval in shape with the 

 inner side (radius) of the costal margin blackish ; the veins are heavy and 



