HRMIPTERA. 



1 43 



Lecdnium olcce also occurs in conservatories, but it is very common in 

 the open air in California. Here it is a serious pest of the orange, 



Fig. 127. — Ptilvinaria innutnerabilis. Female on grape, natural size. (From the Author's Report 



for 1880.) 



olive, and other trees. It is very convex and marked with promi- 

 nent ridges (Plate V. 1). Especially prominent are two transverse 

 ridges and a longitudinal one which frequently form a raised surface 

 of the form of a capital H. 



FlG 128. — Ceroplastes floridensis, adult and young 

 females on Ilex, natural size ; n, young female, en- 

 larged- /•, adult female, enlarged. (From the. Au- 

 thor's Report for 1880.) 



TX -. J , 



, — Ceroplastes cirripediformis. 



Adult females, natural size ; a. fe- 

 male enlarged. (From the Author's 

 Report for 1880.) 



Ptilvinaria. — This genus is distinguished from Lecanium only by 



