OF THE STATE ENTOMOLOGIST. 81 



Believing that the interest vou take in grape-culture, and the sati>;faction that 

 will come of the consciousness of doing something to advance it, will repay you for 

 what little trouble you mav go to in instituting these experiments, 



I am, yours very trulj', 



C. V. RILEY. 



ROOTS TO USE AS STOCK. 



1. Concord. 4. Cunningham. 



» 2. Clinton. 5. Norton's Virginia. 



3. Herbemout. 6. Eentz. 



7. Cynthiana. 



VARIETIES TO GRAFT OX TO ANY OR ALL OF THE ABOVE. 



Of First Importance, 



1. Catawba. 4. VVilder. 



2. lona. 5. Goethe. 



3. Delaware. 0. Any European vine. 



0/ Secondary Importance.. 



7. Ives. 8. Hartford Prolific. 



9. Maxatawney. 



(17) 1 extract from the Transactions of the St. Louis Academy of Science (Vol. 

 Ill, pp. 215, 216) the following descriptions of the mites mentioned : 



Tykoglyphus PHYLLOXERiE Riley & Planchon, Fig. 16.— When full gro\TO 0.0.3^ 

 inch long, and about half as broad. Color pale yellowish, with a brownish medio- 

 dorsal circular spot, around which there extends a gamboge-yellow discoloration, in 

 some specimens restricted, in others occupying nearly the whole upper surface of the 

 abdomen ; trophi, legs, especially two anterior pair, and cephalothoracic sutures, of a 

 faint rosj'-brown ; the epimera of a deeper brown. The hairs of the body arranged 

 much as in T. siro, Linn., springing from minute papillre, and not exceeding in length J 

 diameter of body. Tarsal or terminal joint of legs with a short and prominent basal 

 hair {d) ; sometimes fine and knobbed at tip, sometimes more fleshy and rounded at 

 tip (/) ; often lacking on the two hind pairs; also sometimes with other fleshy growths 

 {g) ; tarsal claw usually distinct (tZ), but sometimes retracted or obsolete (A). The usual 

 pair of small tubercles each side of vulva, and a larger flattened circular tubercle each 

 side of anal slit in (^. 



When immature the color is whiter, with less of the yellow, dorsal discoloration, 

 and the hairs are relatively longer. The form varies according as the cephalothorax is 

 retracted or not, and the abdomen instead of being oval is sometimes constricted in the 

 middle, at others more spherical. 



Many of the characters enumerated belong to all the species of the genus ; and in 

 studying large numbers it is difficult to give any specific diagnosis which shall at once 

 distinguish it from all other described species. To do so will require continued study 

 of all the stages from the moment of hatching, as well as of its Hijpopus form— a study 

 which I have not yet been able to give. 



Hoplophora arctata Riley, Fig. 17.— Length 0.028 inch ; diameter scarcely half 

 the length. The horny shield of a highly polished, smooth, mahogany-brown. Legs 

 and trophi carneous-brown. Dorsum arched. Differs from most described Hoplophoras 

 in the very smooth and unarmed covering, and from all in the great narrowness of 

 body. 



Found associated with the preceding, and probably feeding on the decaying roots. 

 It is, I believe, the first American species described. 



