362 



CONNECTICUT GEOL. AND NAT. HIST. SURVEY. 



[Bull. 



Key to Species. 



1. Scale of male narrow, carinated more or less distinctly 2 



Scale of male oval, without carinae ortholobis 



2. Median lobes of female not fused their entire length 3 



Median lobes fused almost to their tips 4 



3. Mature female scale usually more than 2 mm. long 5 



Mature female scale usually less than 2 mm. long comi 



4. Median lobes notched on their outer margins americana 



Median lobes entire on their outer margins caryae 



5. Median lobes pointed apically 6 



Median lobes distinctly rounded apically 7 



6. Median lobes and lobules of second and third lobes pointed and 



striate euonymi 



Median lobes indistinctly pointed lintneri 



7. Median lobes broadly rounded 8 



Median lobes narrowly rounded, diverging ..pinifoliae heterophyllae 



8. Median lobes close together 9 



Median lobes separated pinifoliae 



9. Both median and second lobes rounded and parallel in general 



direction salicis-nigrae 



Second lobes bluntly pointed and converging furf ura 



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

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

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

 Chrysomphahis 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., v^rhite, 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 



