1892] MARYLAND ACADEMY OP SCIENCES. 151 



The synonymy given by Mr. C. W. Woodwortli for tliis 

 Species, Psyche, vol. V., p. 68, is without foundation. The 

 Cicada hicosta Walker, Horn, p. 112, (cited as C. hicostata 

 by the above writer,) does not agree with any of the 

 varieties of C. marginata known in the collections, still 

 less can the tiny C. aurifera Say, be included among 

 its synonyms. 



Tamaulipas, Mexico, is the most southern limit thus 

 far discovered for the C. 7nargi7iata. A Cicada with 

 the same specific name, from the East Indies, occurs in 

 Olivier, Encyc. Method; but it will doubtless be found to 

 belong to some other of the oriental genera when the 

 species shall be subjected*to further study. 



3. C. canicidaris Harris, Ins. injur, veg. 1842, p. 175 ; 

 1852, p. 190 ; 1862, p. 217, fig. 88. Emmons, Agric. 

 New York, v. V., p. 152, pi. 9, fig. 5. 



This form has a widely extended distribution in North 

 America. It has been found in lower Canada, and at 

 intervals across the continent as far west as to near the 

 Black Hills in Dakota ; from this region it spreads south 

 into Central and Western Texas, and from thence into 

 Mexico. East of the Mississippi river it has been found 

 in all the States from Maine to Northern Florida, and 

 specimens have been collected in Illinois, Ohio, Ken- 

 tucky, Alabama, Louisiana, Arkansas, Kansas and 

 Missouri. 



It varies considerably in size and somewhat in the 

 amount of black ornamentation upon the dorsal surface 

 of the thorax. In many respects it approaches the pale 

 variety of C. tibicen, but it differs from that species in 

 having more prominent eyes, in the general marking of 

 the pronotum, narrowed vertex, and differently shaped 

 opercula. The mesothoric cross is also narrower, and 

 more extended transversely than in the C. tibicen. After a 

 severely close comparison of more than fifty specimens 



