COCCIDAE OF OHIO. 43 



Gemis CHIONASPIS Signoret. 

 This genus was founded in 1869 by Signoret, in the Annals 

 of the Entomological Society of France. In 1897 the group was 

 divided, and in Ohio is reported a single greenhouse representa- 

 tive of the genus Hemidiionaspis Ckll. 



I. Scale of male oval, without carinae, 



Scale of female 2 — 2.5mm. In length; fifth group of 

 gland-spines with more than four ortholobis 



Scale of female smaller, 1.5 — 2 mm. in length; fifth 

 group of gland-spines numbering less than four longiloba 



II. Scale of male carinated more or less distinctly, narrow, 



A. Median lobes more or less fused, 



B. Median lobes fused to near tips, notched on outer margin 



americana 

 BB. Median lobes fused half-way on inner margins, 



C. Lobes broad, entire, close together caryae 



Median lobes similar to caryae, but serrate on margin; 

 outer lobule of second lobe, triangular, acute sylvatica 



Lobes narrower, pointed, second distant from median 

 by half its width gleditsiae 



AA. Median lobes not fused by inner margins, perhaps 

 approximate, 



D. Fifth group of gland-spines from 1-3 pinifoliae 

 DD. Fifth group of gland-spines from 3-11 



E. Median lobes broadly rounded, 



F. Lobules of second and third lobes decidedly rounded 



salicis-nigrae 

 FF. Lobules of second and third lobes obliquely pointed furfura 



EE. Median lobes obscurely pointed, short, divergent corni 



EEE. Median lobes and lobules of second and third lobes 



pointed and striate euonymi 



CHIONASPIS AMERICANA Johnson. 

 Fig. 31. 



Ch. americana Johns., Ent. News, vii, p. 150 (1896). 



Ch. americana Johns., Bull. 111. St. Lab. N. H., iv, p. 390 (1896). 



Ch. americana Cooley, Spec. Bull. Mass. Exp. Sta., p. 41 (1899). 



Scale of female: Length 2 — 3 mm. Plainly convex, broadest near 

 the middle, of firm texture, white sometimes with yellowish tinge, but 

 usually blackened by a sooty substance which renders it very incon- 

 spicuous. The exuviae are about 0.7 mm. long. A conspicuous white 

 mark is left when removed from bark. 



Scale of male: Length 0.7 — 1 mm. Sides parallel, tri-carinate. 

 Exuvia pale-yellow. 



