212 FIFTH REPORT OF THE ENTOMOLOGICAL COMMISSION. 



This is evidently distinct from the Callipterus quercus of Kaltenbach, 

 which is of a pale ocher color throughout and nearly smooth, and has 

 the veins of the wings unmargined. It approaches somewhat closely 

 to G. juglandis Fisch., which is found on walnut. In that species the 

 markings of the abdomen are almost exactlv as in this, but the abdomen 

 is much more drawn out and tapering; it is more than probable, how- 

 ever, that the shrinkage caused by the alcohol has caused this to pre- 

 sent the blunt appearance. (Thomas.) 



299. The "oak blight," or wooly aphis of the oak. 



Schizoneura querci Fitcb. 



This species is found in the northern part of Illinois upon oak limbs. 

 Fitch says it is very similar to another species found on the basswood. 



The winged individuals are black tbrougbout, slightly dusted over with au ash- 

 gray powder. 



The tore wings are clear and transparent ; the stigma is dusky, the rib-veins black, 

 and the third discoidal vein with the basal portion abortive nearly or quite to the 

 fork. The length to the tip of the wings is (0.16) a little over one-eighth of an inch. 

 (Thomas.) 



300. CalUpterusif) guercico/a Thomas. 



Winged form. — Antennae about half as long as the body; not mounted on frontal 

 tubercles; remote at base: third, fourth, and fifth joints equal in length; transition 

 from the sixth to the seventh joint exceedingly gradual ; seventh joint about half as 

 long as the preceding. Rostrum short, not reaching the second coxfe ; apical joint very 

 acute. Nectaries reduced to mere openings. Style none. Wings with the veins bor- 

 dered with brown. Stigma rather short, and blunt at apex, the cubital vein arising 

 from its base. Stigmatal vein not so much curved as usual in this genus; not hyaline ; 

 distance between the base of the cubitus and that of the stigmatal vein equa' to the 

 distance between the furcals, and less than the distance between the base of the 

 cubitus and that of the second discoidal. Second discoidal not sinuous. Body rather 

 elongate. Length, 1.77""^; to tip of wings, 2.79™™. 



It is with considerable doubt that I place this species in the genus 

 Callipterus. It is very probable that it should be placed under Asiphiim; 

 but the only description of this genus which has been published is that 

 given by Koch, and, like the other generic descriptions which were 

 made from memory, after the loss of his eye-sight, is somewhat unsat- 

 isfactory. The following is a translation of the salient points in his 

 description : 



Aaipkum Koch. — Beak short. AntenntTe rather short; the third, fourth, and fifth 

 joints subequal ; the apical joint very small, scarcely perceptible. 



Of this interesting species I have only seen two winged specimens, 

 mounted on a slide, which were communicated by a correspondent with 

 the information that they occurred at St. Louis, on oak. (Thomas.) 



301. Chaitoi)horu8 quercicola Thomas. 



Apterous indiriduah. — Dorsum greenish, with four rows of short tubercles, all of 

 which, except a few in the side rows, are black ; their apical circumference with 

 from three to five bristles; the two middle rows of tubercles stop at the head, 



