62 Journal New York Entomological Society. [Voi. xxi. 



GALL MIDGES IN AN AQUATIC OR SEMIAQUATIC 

 ENVIRONMENT. 



By E. p. Felt, 

 Albany, N. Y. 



It is difficult to draw a sharp line in the case of the gall midges, 

 at least between those occurring under what might be termed an 

 aquatic environment and those inhabiting a moist terrestrial en- 

 vironment. At the outset we would call attention to the following 

 list of European gall midges occurring in what is probably an aquatic 

 environment.^ 



Perrisia inclusa Frfld., in sedge stalks. 



Thuraitia aquatica Riibs. in Carex. 



Thurauia uliginosa Riibs. in Carex. 



Lasioptera arundinis Schin. in reed stems. 



Lasioptera flexuosa Winn, in reed stems. 



There are in addition to the above, a number of other European 

 species which have been reared from Carex and other water-loving 

 plants. These, in case any one be specially interested, are listed in Les 

 Zoocecidies des Plantes d'Europe et du Bassin de la Mediterranee, 

 Vols. I and 2, by Dr. C. Houard. 



Comparatively few American species have been reared from 

 aquatic or semiaquatic plants. The European records for the Cyper- 

 aceae include four genera and nine species, while in this country only 

 two genera and two species have been reported from members of this 

 family. There is good reason for believing that a number of species 

 of Hormomyia live at the expense of plants belonging to this natural 

 order. Here is an excellent field for one wishing to undertake profit- 

 able biological work. The following is a list of American species 

 reared from aquatic or semiaquatic plants. 



Rhabdophaga cephalanthi Felt, reared from twig galls on button- 

 bush, Cephalanthus. 



Cecidomyiid larvae have been recorded from the leaves of water- 

 hemlock, Cicuta. 



Thecodiplosis dulichii Felt was reared from the fruit of Dulichium. 



^ 1910, Die Siisswasserfauna Deutschlands Heft 2 a, Diptera, by K. Griin- 

 berg, pp. 16-20. 



