924 PROCEEDINGS OF THE NATIONAL MUSEUM. ol. xxv. 



YPSOLOPHUS VENTRELLUS Fitch. 



Chxtochiliis ventreUus Fitch, Trans. N. Y. State Agr. Soc, XIII, 1854, p. 234. 



Ypsolophus ventreUus Chambers, Bull. U. S. Geol. Surv., IV, 1878, p. 167.— 

 Riley, Smith's List Lep. Bor. Am., No. 5534, 1891. — Busck, Dyar's List. 

 Amer. Lep., No. 5685, 1902. 



Ypsolophus unicipunctellus Clemens, Proc. Ent. Soc. Phila., II, 1860, p. 125; I 

 Stainton Ed. Tin. N. Am., 1872, p. 229.— Zeller, Verb. k. k. zool.-bot. | 

 Gesell. Wien, XXIII, 1873, p. 286.— Chambers, Bull. U. S. Geol. Surv., | 

 IV, 1878, p. 167.— Walsingham, Trans. Am. Ent. Soc. Phila., X, 1882, i 

 p. 186.— Riley, Smith's List Lep. Bor. Am., No. 5533, 1891. I 



Clemens' type of this species is lost, but in the U. S. National | 

 Museum are three specimens ag-reeing well with the description and 

 determined as unicijpunctella Clemens by Lord Walsingham, who 

 has examined Clemens' type. These specimens undoubtedly repre- 

 sent Clemens' species; the}^ are identical with Fitch's t3'pe of ventrel- 

 lus^ which was found with his large handwritten label in his collection 

 now in U, S. National Museum. 



There is also a series of bred specimens of this species. They bear 

 the label of U. S. Department Agriculture, no. 242, and the following 

 are Professor Riley's unpublished notes on the larva: 



Found at Glen wood, Mo., folding up the leaves of the black oak in little tubes. 

 Length, 0.60 of an inch. A striped white and black worm with a redbrown head 

 and cervical shield. Considering the ground color as white, there is "a black dorsal 

 line, somewhat restricted at the joints, and on each side of the dorsum is another 

 somewhat wavy line separated from a lateral broader one only by a fine white line. 

 Outer edge along stigmata white and underneath black glaucus. 



Piliferous spots above quite large, black with a white annulation; two of them 

 situated in black wavy line and one on lateral black line just above stigmata. 

 Stigmata small, with a smaller piliferous spot just below it and others on venter. 

 First segment dark brown below cervical shield; second segment darker than the 

 others, with a white anterior edge. Last two segments almost entirely black above, 

 being. sharply separated from anus and anal prolegs, which are of a very light yellow i 

 color. Feet black, abdominal prolegs s.\me as venter. Single white hairs from each 

 spot. 



On June 2, one changed to chrysalis. The chrysalis is formed within the leaf, the 

 caterpillar first lining it with white silk. 



The chrysalis averages 0.38 inch in length, with the abdomen comparatively nar- 

 row and small compared with the anterior half, the extremity tapering to a single 

 point, of normal color, but characterized especially by having about six pairs of 

 little elevations on the dorsum just behind the thorax and three others on each side 

 of them along the upper edge of the wing sheets. Moth issued June 15-22. 



The notes continue: 



Zeller says it is the same as a variable, often lighter brown-spotted si:)ecies, which 

 he has often received from Ohio.^ 



This bred series shows the extremes of the different ground colors, 

 which Zeller mentions and proves his assertion that the species is vari- 

 able in ground color from a very light j^ellow brown to a dark purplish 

 brown. 



Riley, Notebook, IV, pp. 29-30. 



