CECIDOMYIA. 189 



On the wild grape ( Fiji's), one species (No. 24), besides another belonging 



to the third category. 



On the hornbeam (Carpinus americana) one species. (No. 25.) 

 On the tulip-tree (Liriodcndro tiilijil^'miin), two species. (Nos. 20 and 27.) 

 On the willow (6'a/z.r), one species (No. 28), besides one belonging to the 



third category. 



On Impatiens fulva, one species. (No. 30.) 

 On the blackberry (Rubus rit(osus), one species. (No. 31.) 

 On Agrostis lateriflora (?), one species. (No. 32.) 



III. Perfect insect described, and its habits known. 



On the cereals (wheat, rye, etc.). 



f About the habits of these well-known insects, see 

 C. destructor Say. J Dr. Harris's Treatise, etc., and Dr. Fitch's papers : 

 C. tritici Kirby. ~j The Hessian Fly (Trans. N. Y. State Agric. Soc., 



L vol. VI), and The Wheat Fly (ibid. vol. V). 

 C. culmicola Morris. See Dr. Harris's Treatise, p. 465. 

 On the locust (Robinia pseudoacacin). 



C. robinix Hald. Amer. Journ. Agric. and Sc., vol. VI, 103. Harris, 

 Treatise, etc., p. 452. (Haldeman's paper is also reproduced in the 

 Proc. Boston Soc. of Nat. Hist., vol. VI, January, 1859.) The larva 

 lives upon the leaves, the margins of which it deforms into a roll. 

 It is evident, from Mr. H.'s description of the perfect insect, that 

 it belongs to the sub-genus Diplosis. (See also Fitch, Reports, vol. 

 II, No. 332. ) 



C. pseudoacacix Fitch, Reports, vol. II, No. 331. The larvae injure the 

 tender young leaflets near the tip of the stem, causing them to be 

 folded like a little pod (in July and August). They transform 

 under ground. 

 On the gooseberry (Ribes ui~a crispa). 



(J. yrossulariap. Fitch, Reports, vol. I, p. 176, and vol. II, No. 150. The 

 berries turning red prematurely and becoming putrid, contain the 

 bright yellow larva?. Dr. Loew thinks that the perfect insect be- 

 longs to the sub-genus Asphondylia. (See p. 7.) 

 On the willow (Salix rigida and S. lucida). 



C. salicis Fitch, Am. Quart. Jouru. Agric. and Science, vol. I, p. '2<>:\. 

 (See also Dr. Harris's paper in Proc. Bost. Soc. Nat. Hist., vol. Vi I, 

 January, i860.) The gall is a woody tumor, surrounded by the 

 dry and brittle terminal bud, at the tips of the twigs. It contains 

 but a single larva. The name of the species must be changed, as 

 there is already a European C. salicis. I propose to call it C. rigid , . 

 On the alder (Alnus serrulata). 



C. serrulatce 0. S. (See below, No. 16.) 

 On the hickory (Carya). 



Diplosis caryjR 0. S. (See No. 1 . ) 

 On the wild grape. 



