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most black, and of the usual ovate form, while others were pale, even 
to creamy yellow; the forms differ also widely, some being broad oval 
and much less convex than others. Some appeared almost hirsute. 
I noticed in the same colony, three different forms and colors. On 
this account 1 concluded the species which I had at first described as 
new, was but a variety of Dr. Fitch’s species, and so I think with 
reference to Mr. Monell’s species. 
SlPHONOPHORA SETARIOe. Thos. 
Aphis setarice. Mon ell. 
It is a matter of doubt to which genus this species belongs; the 
antennae are situated on tubercular prominences which are quite distinct; 
but these are not closely approximate. The first joint is gibbous in¬ 
ternally at the tip. The honey-tubes are rather long; the tail is also 
as is usual in Siphoriophora. It is probable the species would be more 
correctly located if placed in Myzus , with which it agrees in several 
respects. 
Aphis cephalanthi. Thos. 
Mr. Monell remarks that he supposes the semicircular fourth vein 
suggested my comparsion of this species with those of Callipteras. 
In this he is mistaken for I do not use this character, which was sug¬ 
gested by Passerini. 1 compared it with Callipterus simply on account 
of the dark shadings of the veins, which is so common in that genus. 
Aphis medicaginis. Koch. 
Mr. Monell has discovered this little species on Caragana arbor- 
escens , Robinia viscosa and Melilotus italica , which is the first notice we 
have of it in this country. 
It is distinguished by the almost uniform shining black color of its 
body; the pale yellowish-white an ten me and legs, the former dusky at 
the tips, the latter with the outer portions of the thighs, and tarsi 
black. Antenme but little over half the length of the bodv; honey- 
tubes of medium length; wings hyaline. 
j 
SlPHONOPIlORA SALICICOLA. Thos. 
Aphis salicicola. Monell. 
There has evidently been an admixture of specimens received from 
Miss E. A. Smith, but this occurred before I received them. Some of 
