TllK COCCIDAK OK CAUKl )KNIA. 45 



Chionaspis quercus Comst. 



(Oak Scale.) 



Seal" of Ffniale. — Long, narrow at anterior end, much widened 

 posteriorly, quite convex. Exuviae brownish yellow, remainder of scale 

 white, though often appearing gray from dust and hairs from the stem 

 to which the scale is attached. 



Body of Female. — The last segment with the anterior grouj) of spin- 

 nerets consisting of about 10, the anterior laterals of from 17-20, and 

 the posterior laterals of from 10-18. 



This species is peculiarly characterized by having an undivided lobe 

 on the meson; this lobe is large and rounded distally. The second and 

 third lobes of each side are very small and are laterad of small incisions 

 in the margin of the segment. In each case there is a reniform thick- 

 ening of the body wall bounding each incision anteriorly. There is 

 also a similar incision with a rudimentary lobe and reniform thickening of 

 the body wall about midway between third lobe and the penultimate 

 segment. The plates are inconspicuous and spine-like; there are usually 

 one or two laterad of second ventral spine, two or three between third 

 and fourth lobes, and usually five between fourth lobe and penultimate 

 segment. The penultimate and antepenultimate segments bear six 

 each; those on the latter are much expanded at the base. 



The spines are long and conspicuous; those on the dorsal surface are 

 situated as follows: One on each side at the base of the lateral margin 

 of median lobe, one laterad of each of the second and third lobes, and 

 a fourth one near the center of the anterior group pf plates. Those on 

 the ventral surface are as follows: A short one nearly ventrad of the 

 first dorsal spine, a large one laterad of each of the second and third 

 dorsal spines, and a fourth one a little cephalad of the fourth dorsal 

 spine. 



Scale of Male. — The scale of the male is snow-white, with the larval 

 skin very light yellow. The texture of the scale is quite loose and the 

 carinae prominent. Length, 1.25 nun. 



The adult male is as yet unknown. Pup;e mounted in balsam are 

 bright yellow in color, with eyes purplish black. Fully grown male 

 larvffi in balsam are yellowish brown. 



On white oak {Qupreu.H lohata). The females occur on the bark of 

 small limbs; the males on the leaves. 



Chionaspis wistariae Coo ley. 



Scale of Female. — Length, 1.8 to 2.3 mm. Plainly broadened poste- 

 riorly, rather thin in texture, dirty white in color. Exuvijc .8 mm. 

 long, brown. 



