THE CANADIAN ENTOMOLOGIST. 85 



There are five species of Lithocollctis mining the leaves of O. Vir- 

 ginica, two of which have been described by Dr. Clemens, and two others 

 in my collection are yet to be described. This species is smaller than 

 any of those mentioned in my former communication, and differs from 

 them in the larval state ; the differences from them in the imago are 

 indicated by the italics. 



Kentucky — not abundant. 



Since my former communication I have had L. Ckmensella {Ante, 

 p. 57), from mines on the under side of the leaves of the sugar maple 

 (A. saccharinnm), identical with those of Z. lucidicostcUa Clem., and 

 which I supposed were the mines of that species ; but / think that the 

 pupa of Z. Clemensella inhabits an ovoid cocoon of frass. As the 

 exclusion of a larva from its mine for the purpose of describing it, 

 necessitates the death of the larva, and there are thus two species in 

 mines exact! v alike, it follows that Dr. Clemens may have described the 

 larva of Z. Clemensella as that of Z. lucidicostcUa. 



Since then I have also taken L. caryce-albclla in U'isconsin. No 

 doubt the other species mentioned also occur there, as their food 

 plants all thrive as far north as Green Bay. 



Erratum. — For L. tiliacella ante, p. 56, read Z. tiliceclla. 



SECTION b. 



Dh'. r. — Anterior ivings golden, saffron, orange-reddish or brownish- 

 yellow. 



Sub-div. a, with an apical spot. 

 '•'With a basal streak. 



f Without fascia, but with dorsal and costal streaks. 

 8. — Z. Ostrytpfoliella Clem., loc. cit. supra. 

 9. — L. Obscuricostclla " " " 



I have found both of these species in Kentucky, though the former 

 is rather rare. Both mine the leaves of the Ironwood (Ostrya Vir- 

 ginica). Z. Obscuricostclla has the basal streak dark margined. Z. 

 Ostrycefoliella has it unmargined ; and there are other differences be- 

 tween them. Both are small ; At. ex. less than ]/ A inch. Larvae of 

 first (cylindrical) group mines on the under surface. 



