362 



CONNECTICUT GEOL. AND NAT. HIST. SURVEY. 



[Bull. 



Key to Species. 



Scale of male narrow, carinated more or less distinctly 2 



Scale of male oval, without carinae ortholobis 



Median lobes of female not fused their entire length 3 



Median lobes fused almost to their tips 4 



Mature female scale usually more than 2 mm. long 5 



Mature female scale usually less than 2 mm. long corni 



Median lobes notched on their outer margins americana 



Median lobes entire on their outer margins caryae 



Median lobes pointed apically 6 



Median lobes distinctly rounded apically 7 



Median lobes and lobules of second and third lobes pointed and 



striate euonymi 



Median lobes indistinctly pointed lintneri 



Median lobes broadly rounded 8 



Median lobes narrowly rounded, diverging . .pinifoliae heterophyllae 



Median lobes close together ... 9 



Median lobes separated . . . pinifoliae 



Both median and second lobes rounded and parallel in general 



direction , salicis-nigrae 



Second lobes bluntly pointed and converging furfura 



/— ' ,j& Marginal spii 



Median 1 obes ' 



p\raot]s'e}^^.^ 3 



Pygidium — -\^* 



Fig. 35. Coccid structures (Diaspinae). (i) Lepidosaphes ulmi Lin- 

 naeus, — pygidium of female snowing dorsal and ventral surfaces. (2) 

 Lepidosaphes ulmi Linnaeus, — female, showing general appearance. (3) 

 Chrysomphahts aonidum Linnaeus, — margin of female pygidium (after 

 Dietz and Morrison). Greatly enlarged. Drawing by Dr. Philip Garman. 



C. americana Johnson. White elm scale. 



Ent. News, vii, 150, 1896. 



Scale of female : Length 2-3 mm., white, sometimes yellowish, 

 often blackened by sooty mold; convex, broadest near middle. 

 On removing from bark a conspicuous white mark remains. 



Female: Median lobes prominent, fused on their inner, and 

 notched on their outer, margins. Median group of circumgenital 



