STATE HORTICULTURAL SOCIETY. 161 



Aphis must be admitted. Whether it is the same as the European species 

 I am unable, at this time, to state, as I have no specimens at hand. 



This species is green, with the antennae black; sometimes it is 

 entirely black. Length of the apterous individuals about four-hundredths 

 of an inch ; to tip of wings in the winged individuals about twice that 

 of the body. 



They are found on the tender shoots, leaf-stalks and flower-stalks, 

 especially the last. 



Of the numerous species of this group of Aphides, found on orna- 

 mental and forest trees, but (ew have been carefully studied. 



Of those which have been determined, I notice briefly the following, 

 some of which vary somewhat from the typical form, and may have been 

 placed in other genera, but if so, I am not at present aware of the fact. 



23. Aj>/us (?) caryella, Fitch. The Little Hickory Plant-louse. 



This species, and the three following, which were originally described 

 by Dr. Fitch, and from whose work our information in reference to them 

 is chiefly derived, are different from any heretofore described. Their 

 wings are not elevated in the steeply inclined manner of the preceding, 

 but are laid horizontally on the back when at rest ; their bodies are 

 strongly depressed, and the nectaries are without tubes, being simplv 

 honey-pores. Their secretion of honey-dew is much more limited than in 

 the others. They are not so sedentary as those we have previously de- 

 scribed, moving about over the surface of the leaf much of their time ; nor 

 do they appear to live in colonies like the others. They reside upon tiie 

 under side of the leaves, chiefly along the mid-vein, in the angles formed 

 by the branch veins. 



This species, which is most commonly met with, measures nearly or 

 quite one-eighth of an inch to the tips of the closed wings ; is pale yel- 

 low; the antennje white, with alternating black rings; wings, transparent 

 and without spots, their veins slender and pale yellow; legs, yellowish- 

 white. The abdomen is depressed and egg-shaped. The antennae are 

 longer than the body, tapering and semi-jointed, the two basal joints short 

 and twice as thick as the succeeding ones ; third joint longest, the seventh 

 sliorter than the sixth. 



This approaches very near, in some respects, to Westwood's genus 

 Thelaxes, but difters in having the antennae long instead of short, as they 

 are in that genus; and it appears, moreover, that the species belonging 

 thereto are gall-makers. It is probable a genus has been formed for the 

 reception of such species as this, but I have no means of reference thereto 

 at present. The other species are as follows : 



24. Aphis (?) punctatella, Fitch. The Dotted-winged Hickory Plant- 



louse. 



Very similar to the preceding, and possibly but a variety, though con- 

 sidered by Dr. Fitch specifically distinct. The color similar to A. cary- 

 ella, except that the feet are black, and there is a black dot on the base 



