366 Annals Entomological Society of America [Vol. XV, 



This form seems to frequent more elevated and arid regions 

 of Mexico, whereas typical occatoria is usually found along the 

 south-eastern coast-line at comparatively low elevations. 



Six specimens in the collection of Mr. H. G. Barber come 

 from Huachuca Mountain, Arizona, July 13 to 22, 1905. 



Cicadella dohrnii Sign. 



I have seen only a few examples of this species from Arizona 

 and Mexico. It was described by Signoret from Mexico, and 

 without doubt this is the insect which later was described by 

 Baker, (1898, p. 286) as Tettigonia aurora and by Fowler 

 (1900, p. 269, PI. XVIII, Fig. 5) as delicata. This has been 

 pointed out by Dr. Ball, 1901, who gives a very comprehensive 

 description and an excellent figure by which it can be readily 

 determined. 



Cicadella similis Walker, 1851. 



In comparing this species with the description of the genus 

 Kolla Distant, 1908, I find that it does not agree very well. In 

 the first place, the vertex is obtuse, rounded anteriorly rather 

 than subconically narrowed; in the second place, the fovea 

 next to the eye is scarcely discernible, variable, and amounts in 

 many cases to a shallow depression which is so often seen in the 

 genus Cicadella. 



The face has the lateral areas somewhat strongly striate, but 

 this is also a character in most of the Cicadella species. The 

 centrally longitudinal area is sometimes flattened, and some- 

 times gently rounded, the dark and light arches meeting a 

 narrow, light, central longitudinal vitta. The outline or profile 

 of the face is markedly different from our species of both 

 Cicadella and Kolla, bending rather abruptly just before the 

 clypeus and the latter itself having quite a bend, these two 

 bends producing a wavy appearance to the lower part of the 

 profile of the head. Considering the above characters, I suggest 

 that this species be placed in the genus Cicadella, where I think 

 its color pattern, shape and general appearance will be in 

 greater agreement. 



