March, 1922.] Davis: Cicadas of Virginia. 39 



broadly and evenly rounded ; obliquely truncated but slightly 

 on the inner side. Expands about 90 mm. 



robinsoniana new species. 

 Dorsum of abdomen shining black usually with a small white 

 spot each side at base of segment three ; blackened area on 

 the under side of the abdomen 'a distinct shining stripe; ex- 

 tremities of the opercula obliquely truncated on the inner 

 side. Margin of the front wings suddenly bent near the 

 middle. Expands about 90 mm., .linnei (Smith & Grossbeck). 

 A definite longitudinal band of black on the under side of the 

 abdomen ; head with the front rather prominent. A rather 

 small species. Expands about yz mm. 



canicularis (Harris). 



A narrow irregular band of black on the under side of the 



abdomen ; head rounded in front ; a rather small species. 



Expands about T2 mm davisi (Smith & Grossbeck). 



CC. Hind margin of pronotum or collar black or nearly so. 

 D. Central area of the abdomen beneath black. 



Opercula long and with the legs usually somewhat chestnut 

 colored ; the uncus when seen in profile forked, re- 

 sembling the open mouth of a snake. Expands about 



95 mm similaris (Smith & Grossbeck). 



Opercula much shorter, more rounded, and- the black area 

 on the under side of the abdomen in the nature of an 

 even stripe. Uncus not forked. Expands about 95 mm. 



lyricen (De Geer). 



Blacker than typical lyricen, lacking the considerable amount 



of fulvous markings on the pronotum and mesonotum, 



A fulvous somewhat anchor-shaped mark centrally on 



the pronotum. Expands about 95 mm. 



lyricen var. engelhardti (Davis). 



DD. Central area of the abdomen not black beneath, often prui- 



nose, as well as the long opercula. Collar black, often 



with a greenish spot each side near the outer angles. 



Expands about 95 mm sayi (Smith & Grossbeck). 



BB. Uncus broad at the base, triangular in shape and generally about as 

 broad as long. Opercula broad and rounded at the extremities; 

 no black area on the central part of the abdomen beneath, usually 

 unicolorous. Wings broad ; hind margin of the pronotum or 

 collar green or greenish ; dorsal segments of the abdomen not 

 margined with brown ; in fresh specimens the basal segments 

 pruinose, also the terminal segments, leaving the four middle 

 segments black. A very large species expanding over no mm. 



auletes (Germar). 



