STATE AGRICULTURAL SOCIETV 447 



HICKOItr. LEAVES. 



have only one of these conical galls upon them, others hav^e two, 

 three or more. As many as a dozen may be found upon some 

 leaves. And wandering about upon the surface of the leaf tlie 

 mature winged flies will be found, which liave crawled out from 

 the gall in which they were nurtured, and in which multitudes 

 of young lice in all the stages of their growth will be found 

 crowded together and covering the walls of the cavity, with a few 

 newly hatched winged individuals similar to those seen outside 

 of the gall, but smaller and lighter colored, the wiiole of their 

 body being pale yellow or with only a dusky band between the 

 bases of their wings. As soon as they leave the gall, however, 

 and expose themselves to the light and air, they change to a black 

 color, the abdomen only remaining pale yellow often tinged with 

 green. Some individuals may be observed in which the change 

 in their colors is not fully completed, showing a pale yellow band 

 upon their necks. Their legs are short and pale with black knees 

 and feet. The antennae are short, thick and thread-like, scarcely 

 longer than the head, and with but three or four joints, difficult 

 to discern. The wings are placed horizontally upon the back and 

 not elevated as in most of the plant lice. They are smoky-trans- 

 parent with a more dusky spot or stigma on the outer margin 

 between the tip of the rib-vein and the outer edge, the rib-vein 

 being perfectly straight and not curved as in other plant lice to 

 give a greater width to this stigma-spot. In addition to the rib- 

 vein the fv)re wings have only three oblique veins, all of which 

 are straight and black. The first of these is placed forward of 

 the middle of tlie wing and runs from the rib-vein to the inner 

 margin. The last one runs from the stigma to the tip of the w ing 

 and is abortive or imperceptible at its base where it starts from 

 the stigma. The middle vein is parallel with this last and starts 

 from the first vein ab(>veits middle and reaches the inner margin 

 equidistant from the tips of the other two, its base bting abortive 

 for a short distance. The Jiind wings form a very cons]»icuous 

 angular point on tlu' middle of their outer margin and have a 

 longitudinal rib-vein but are wholly destitute of any obli(juevein 

 running from it to the inner mai-gin. 



From what has now been stated it will be seen that this small insect 

 presents some notable peculiarities. We have a second species, 



