PLATK XIII. 
Pig. 1 . — Chionaspis ortholobis Comstock, on Salix sp. Anal plate of fe- 
male, showing somewhat irregular position of dorsal glands. 
Fig. 2 . — Chionaspis ortholobis Comstock, on cottonwood, Populus sp. Anal 
plate of female, illustrating variations in second and third lobes. The dorsal 
glands, second and third rows, in this figure, as in figure 1, are shown beneath 
the circumgenital glands. These are frequently located laterad of circumgenital 
glands. 
