ZooL.— Vol. II.] PATTERSON— NOTES ON CEROCOCCUS. 389 



are replaced by minute non-segmented ones scarcely longer 

 than wide and truncate at the tip ; spines take the place of 

 the long caudal filaments. Spiracles also appear; and the 

 double pits are increased in number and scattered irreg- 

 ularly over the surface of the body. The insect has in- 

 creased in length from .21 mm. to .354 mm., and the 

 segments of its body are less distinct than in the first stage. 



Adult Female. — Although there may be changes in 

 structure between the second and the last stages, they have 

 not been observed. The adult female (fig. 5) is from .75 

 to I. mm. in length, regular in outline, and balloon-shaped. 

 The terminal segment of the body is the only one that is 

 plainly distinguished from the others. It is strongly chitin- 

 ized and ends in two prominent points or lobes. Each 

 lobe has a stout spine near its tip and bears several short 

 ones on its inner margin. Both dorsal and ventral surfaces 

 of the insect are covered with irregularly arranged pits, 

 single and double. The latter, which have hairs growing 

 from them, are not so numerous as the former. The an- 

 tennas (fig. 6) are small, unsegmented, and truncate at the 

 tip. I have found only four comparatively long bristles and 

 several short ones, although it has been stated by one 

 author in a previous account that there are five. On the 

 ventral side of the insect are two pairs of large spiracles 

 (fig. 7), near each of which is a group of spinnerets, vary- 

 ing in number from two or three in the second stage to from 

 eight to twelve in the adult. 



Cerococcus quercus Comst. 



Plate XXII, Figs. 10-15; Plate XXIII, Figs. 16-22; Plate XXIV, B. 



Cerococciis quercus is a large Coccid abundant on the oaks 

 of Arizona and southern California. According to Pro- 

 fessor Comstock, it is found on Quercus oblongifolia , Q. 

 undulata, var. zurightii, and probably on Q. agrifolia} 

 The insects secrete thick coverings of bright yellow wax 



1 U. S. Agric. Report 1881-1882, p. 213. 



