No. 34-] HEMIPTERA OF CONNECTICUT: COCCIDAE. 355 



For the most part the females consist of a flattened or convex 

 derm or shell which is part of the insect, and which is usually 

 brown in color. On the death of the female a mass of eggs remains 

 under the shell, except in Pulvinaria, which secretes a white, 

 cottony ovisac. This shell is usually heavily chitinized, with the 

 caudal extremity distinctly cleft, at the apex of which are a pair 

 of anal plates ; between and below these plates is the anal opening, 

 the ring bearing from eight to ten hairs. Some species are found 

 on the bark of native trees and shrubs, and others occur on the 

 leaves and stems of greenhouse plants. 



Key to Genera* 



1. Female not globular 2 



Female globular ; on conifers Physokermes, p. 360 



2. Female more or less convex; derm not marked off into plate-like 



areas ; anal cleft rather short 3 



Female rather flat, marked off by lighter lines into plate-like areas ; 

 anal cleft very long; middle spiracular spine more than twice 

 as long as outer ones Eucalymnatus, p. 356 



3. Antennae and legs fairly well developed; anal ring with eight 



hairs; middle spiracular spine distinctly longer than the other 



two 4 



Antennae and legs rudimentary ; anal ring with ten hairs ; spiracu- 

 lar spines all short and stout, nearly equal in length ; setae around 

 anal plates, of two sizes ; derm with circular gland pores ; hemis- 

 pherical, irregular, occurring in clusters on branches of tulip 

 tree Toumeyella, p. 356 



4. Female not secreting an ovisac; eggs deposited beneath the body 5 

 Female secreting a white, cottony ovisac in which the eggs are 



deposited ; middle spiracular spine more than twice the length 

 of the other two Pulvinaria, p. 355 



5. Female body convex ; derm with large circular or oval pores 6 



Female body flattened or only slightly convex; oval or elongate 



oval ; derm with small scattered pores Coccus, p. 356 



6. Derm crowded with pores ; middle spiracular spine more than 



twice as long as the outer two Saissetia, p. 359 



Derm not crowded with pores; middle spiracular spine (except in 



nigrofasciatimi) less than twice as long as the outer two 



Lecanium, p. 357 



Pulvinaria Targioni-Tozzetti. 



The females of this genus resemble those of Lecanium, until 

 they oviposit; the eggs are laid in a large white, cottony ovisac 

 with the body of the female inclined at an angle with the resting 

 surface, attached to one end of the ovisac. 



Key to Species. 



Adult female with large circular or oval, closely-set, derm pores 

 on center of dorsum; ovisac elongate; on leaves of maple acericola 



Adult female with smaller, scattered or irregularly grouped derm 

 pores ; ovisac scarcely longer than body ; on twigs vitis 



* The following key has been adapted from "The Coccidae or Scale 

 Insects of Indiana" by Dietz and Morrison. 



