90 
Psyche 
[April 
The Monecphora hicincta var. hicincta material was very 
kindly sent to me at Woods Hole, Mass., in July, 1921, by Mr. 
Z. P. Metcalf and Mr. C. O. Eddy of the North Carolina Agri- 
cultural Experiment Station. The M. hicincta var. ignipecta 
material was collected at Wellesley, Mass., partly by Mr.' 
Morse and partly by myself. I could not find Monecphora at 
Woods Hole, so trusted to obtaining it in September at Welles- 
ley, as it was reported to be a late summer form. But the only 
specimens found as late as September 15 were females and they 
had laid their eggs and were much shrivelled in appearance. 
The material finally studied was collected in July, 1922 at 
Wellesley. A careful watch was kept from July 1 on for the 
first forms to appear. The first individual was taken on July 14. 
By July 21 the species was abundant. They appeared just as their 
food plant, the bunch-grass, was attaining its full growth. In 
looking over a field of the grass, one could pick out the Monec- 
phora as conspicuous black specks clinging to the grass at 
various distances from the ground. I did not find any nymphs 
in their frothy masses of spittle on these plants although I care- 
fully examined the young tufts of grass for some time before the 
adults appeared. In the Monecphora hicincta var. hicincta 
material sent me from North Carolina, the nymphs were on the 
roots of the food plants. These nymphs were not reared to as- 
sure their identity, but they were surrounded by a typical mass 
of white exudate and those old enough to contain mature sperm 
cells showed the same cytological conditions as the adults. 
Probably an examination of the roots of the young bunch-grass 
around Wellesley in early July, would show the habits of 
Monecphora hicincta var. ignipecta to be similar. 
The cytological study of the chromosomes of these two 
varieties reveals them to be identical. This was tested by 
camera lucida drawings placed side by side. The spermato- 
gonial number is 19, the primary spermatocyte 10, and the 
secondary spermatocyte 9 and 10. They are like other species 
of Cercopidse studied (Boring H3 and Boring & Fogler T5) in 
having an X chromosome which divides in the second spermato- 
cyte division. The chromosomes have the same absolute size in 
