AMERICAN HOMOPTERA. 285 



angle of the rib-vein and the first discoidal, or a very short distance 

 from the angle on the first discoidal, as I have observed in a good num- 

 ber of specimens, (in one specimen I observed it to rise from the stig- 

 matic vein near its basal origin, and pass back with a short, paraboloid 

 curve to its normal position) ; stigmatic vein nearly straight or slightly 

 sinuous. Posterior wing comparatively large, the discoidal quite ob- 

 lique and consequently long. Honey-tubes not seen. Legs with a few 

 short hairs. Length of body .05 — .06 inch; of wings .07 — .10 inch; 

 of antennas .02 — .025 inch. 



Larva at first reddish, eventually brown and darker purplish, kc. 

 Eggs reddish-brown. 



Inhabits spiny galls, at the present time, on Hamamelis Vir(/inica 

 (Witch Hazel), from half to an inch long, of a sub-conoid or elipsoidal 

 form, narrowest at the base, very rough on the outside, and covered 

 with numerous somewhat thorny spines, of frequently one-fourth of an 

 inch in length ; color leaf-green, thickly studded with small, reddish- 

 brown glandular spots, inside smooth, greenish, and filled with numer- 

 ous (a hundred or more) larvae and imago, and a large quantity of 

 whitish sugary dust and liquid secretions. 



These galls are the transformed fruit; they open with a circular 

 mouth and widening beveled or funnel-like exit of about one-fourteenth 

 of an inch in diameter, in the conical base beside the stem. The Aphis 

 in these galls are just beginning to develop into the winged state; while 

 those in the above-named species, on the leaf, disappeared about a month 

 ago; both are black. The most material difference noted is in the an- 

 tennae. 



In this species I observed the second discoidal vein, in several speci- 

 mens, developed to the basal origin ; in the former species none ; this 

 second discoidal arising, as it does, from the first, as above noted, might 

 almost, without impropriety, be considered a branch of the first discoi- 

 dal. Moreover, between the galls of these two species, on the Witch 

 Hazel, there is a marked difference, but if that could be explained on 

 account of locality, from the other characters, I am still induced to be- 

 lieve that this is entitled to specific rank, 



Mt. Carroll, 111., August 24, 1867. 



