35 ENTOMOLOGICAL NEWS. [Oct., '08 



oak, as the infested tree harbors many thousands of the larvae 

 and under its branches, the adults are found in swarms. Every 

 leaf is infested, by from one to over one hundred, as high up as 

 one can climb, certainly within ten feet of the top ; but the in- 

 festation at the highest point is not as extensive as that of the 



lower limbs. 



Cecidomyia (?) foliora n. sp.* 



Female. Length, 1.95 to 2.55 mm. Antennae of 14 segments, length 

 95 to .99 mm. ; the two basal segments light yellow, the others brown, 

 thickly clothed with coarse brown hairs. Face bright orange- red; back 

 of head with a fringe of dark brown setae. Mesonotum Van Dyke 

 brown, with pale submedian lines, sparsely covered with fine setae. 

 Sternum, pro and metapleura light brown, mesopleura dark brown. 

 Abdomen with the five basal segments bright orange-red, thence gra- 

 dually fading to a light yellow at the apex and lemon yellow on the 

 protrusible ovipositor; within a few days the color of the ovipositor 

 often darkens to an orange-red. Surface sparsely clothed with yellow 

 setae. Legs light yellow, thickly covered with dark brown pubescence. 



Male. Length, 1.20 to 1.65 mm. Antennae 1.50 to 1.65 mm. Scutel- 

 lum orange-red; pleura pale brownish yellow, mesopleura marked 

 with black. Abdomen orange-brown. 



The large bright orange-red abdomen and larger size of the 

 females, make them quite conspicuous among the smaller males 

 with their dull-colored abdomens. The color darkens within 

 a few days after collecting, so that fresh material is necessary 

 for identification ; the gall, however, is quite characteristic and 

 cannot be mistaken. 



Described from nineteen specimens on eight pins, and from 

 sixteen specimens mounted on six microscopic slides eighteen 

 male and seventeen female cotypes. These have been deposited 

 as follows: Two females and one male (one slide), and two 

 females and three males (two pins) in the collection of the 

 United States National Museum at Washington, D. C. ; two 

 females and one male (one slide), and two females and three 

 males (two pins) in the collection of the New York State En- 

 tomologist, Albany, N. Y. ; the remainder five females and 

 five males (four slides), and four females and five males 

 (four pins) in the collection of the Massachusetts Agricultural 

 College. 



* Foliora from folium, leaf and ora, edge. 



