730 The American Naturalist. [August, 
Fort Collins, where, I understand from Prof. Gillette, the po- 
tato is one of the leading crops. Yet it is probable that the 
disturbance of the land in the cultivation of potatoes would 
prevent the over-abundance of D. solani.) 
Atriplex canescens has proved a mine of wealth to the cocci- 
dologist. The following species are found on it in the Mesilla 
Valley, n. m.: Dactylopius solani var. artriplicis Ckll., Lecanio- 
diaspis (Prosopophora) yucce var. rufescens (Ckll.), Ortheria an- 
næ Ckll., Mytilaspis albus var. concolor Ckll., Ceroplastes irregu- 
laris Ckll. 
*Ortheria nigrocincta n. sp. On narrow leaves, apparently 
of aspecies of Composite, Gila Hot Springs, N. M., July 20, 
1894, coll. C. H. T. Townsend. When Prof. Townsend gave 
me this insect, I supposed it was only O. annex, but a careful 
comparison reveals the following good distinctive characters: 
2. Length, with ovisac, 4 mm., breadth 2 mm. ; ovisae pure 
chalk-white, firmer than in anne, longitudinally ridged above. 
Body (dried) coal-black, legs dark brown, antennz reddish- 
brown. Sides, between dorsal and lateral lamellee, broadly 
black from the exposed body, Anterior dorsal lamelle broader 
antero-posteriorly than in annex. Posterior lamelle much as 
in anne, free from ovisac, but not so rapidly increasing in 
length mesad; the innermost one not being greatly longer 
than the outermost. 
Another allied species is O. sonorensis, which will be de- 
scribed in Prof. Townsend’s report on his recent trip in Mex- 
ico. The following table will separate the three : 
A. Length with ovisae over 5 mm. 
1. Posterior lamellz about equal in length ; a small por- 
tion of hind-dorsum free from secretion, sonorensis Ckll. 
2. Posterior lamellz successively longer mesad, the inner- 
most at least twice as long as the outermost; dorsum 
covered by secretion, anne Ckll. 
B. Length with ovisac under 5 mm., sides of dorsum naked, 
; nigrocincta Ckll. 
*Chionaspis pinifolii (Fitch). Last December I found this 
scale on some pine branches brought from the Organ Moun- 
tains. (It is doubtless native on the pines of the Rocky Moun- 
