2IO DAVENPORT ACADEMY OF SCIENCES. 



Phylloxera minimum Shimer. 



Dadylosphcera minimum Shimer. Trans. Am. Ent. Sec, 2, pp. 

 391-2. 



Shimer' s original description is as follows : 



"Small round galls, generally very numerous in the leaves, and 

 in some cases almost entirely covering them, a single leaf some- 

 times containing upwards of 250 galls; the average size -larger 

 than those of No. 8 [Ph.Joveatum Shimer], although often quite 

 as small, the larger ones measuring three-sixteenths of an inch 

 [5"'".] in diameter. They were (June 25th) quite hard and 

 smooth, and present, especially above, a bright, shining appear- 

 ance; they were quite thick and plump, the vertical diameter 

 compared with the horizontal diameter being as 2 to 3, and were 

 much more plump and elevated above the leaf than those of No. 8 

 [Ph. carya-semen Walsh]. The portions of the leaf between the 

 galls had in some cases turned crimson. I found from three to 

 twenty-five inhabitants in a gall; the round opening beneath 

 was so close as to be pretty safe against enemies, as I found none 

 in the galls opened thus far. lyarvse and pupae whitish, with red 

 eyes; mother insect cinnamon color and smaller than the pupa. 



"On July 5th I found winged imagos in all the galls, large and 

 small, that were opened, the smallest galls not much exceeding 

 .05 inch [i™'"] in diameter ; when opened, the young insects eagerly 

 ran out, and all presented the same pale, translucent appearance, 

 with minute dark spots on the anterior part of the body, which is 

 in contrast with the inhabitants of gall No. 8. The winged imago 

 was first observed on June 30th. 



"Winged imago. — Body, antennse and legs, pale yellowish-white ; the 

 head and a band around the thorax, dusky; wings on the back in repose, 

 translucent, neuration obsolete, the stigma scarcely perceptible. Length 

 of body .025-.03 to.6-0.8"""]; to end of wings .045-.05 inch [i-i.i"""] 



' ' These insects are much smaller, paler in color and less dis- 

 posed to fly than any of the other species noticed in this paper. 

 From a gall .05 inch [i.i"""] in diameter, I took a single winged 

 imago with body .025 inch [0.6'"'"] in length; with it there were 

 a few eggs, but no other insect. I verified this same circumstance 

 in several other small galls of this species, and it therefore appears 



