PROC. ENT. SOC. WASH., VOL. 24, NO. 4, APR., 1922 93 



Poecilogony is therefore a practical possibility: and since this 

 is so it follows that the biologist undertaking operations with 

 groups of organisms in which this phenomenon exists can not 

 safely rely on the appearances presented by any given stage of 

 the animal with which he has to deal: but must acquire a 

 thorough knowledge of it in all the transformations through 

 which it passes in the cycle of its development. 



Finally, it is of interest to note that although such cases as 

 the one studied in this paper may be considered as illustrations 

 of certain special modes of the transformations of species the 

 differences between the larvae being interpreted as the result 

 of the action of different environments or the resemblance 

 between the adults as convergence resulting from the action of 

 similar environments on forms originally unlike nevertheless 

 as the mathematical example shows, these cases could exist 

 were species as fixed or immutable as are the mathematical 

 formulae for the curves given above. Such cases can not 

 therefore be considered as furnishing evidence for the trans- 

 formist hypothesis as they can be perfectly understood without 

 reference to this theory. 



NEW SPECIES OF CICADELLIDAE (HOMOPTERA) FROM THE 

 EASTERN AND SOUTHERN UNITED STATES. 



Bv J. G. SANDERS AND D. M. DrXoNG, State Capitol, Harrisburg, Pa. 



This paper presents the descriptions and figures of eleven 

 new species of Cicadellidae (Jassidae) including original des- 

 criptions of the males of two species previously described. 

 The types, where not otherwise indicated, are in the collections 

 of the authors at Harrisburg. 



Chlorotettix dozieri, n. sp. 

 Plate 11, Fig. 1, la, 1 h. 



A species with broadly rounded vertex, in general appearance greatly resem- 

 bling -ciriilins but slightly larger with distinct genital characters. Length 

 6 mm. 



Form rather stout and robust. Vertex broadly rounded and parallel mar- 

 gined, a little more than twice as wide between the eyes as the length at middle. 

 Pronotum more than twice as wide as long and less than twice as long as vertex. 

 Scutellum as long as pronotum. Klytra rather short and broad with a small 

 appendix. 



Color: Varying from pale yellowish green to brmht apple green as in viridius 

 and without definite markings. Legs dark u 



