1861.] 



r)( 



The insect of this gall is : 



Ct/nips confluens Harris. 9 " Head and thorax black with numerous lit- 

 tle pits and short hairs; the hind body is smooth and of a shining^]»itch col- 

 or; the legs are dull brownish-red and the fore wings have a brown spot 

 near the middle of the outer edge ; length 0.25; exp. of wings 0.6." (from 

 Harris's description). My specimens measure 0.21. To my knowledge, 

 females only have been found and described. 



The male, either of this species, or of C. qacrcux. iiiauis (No. 3), has been 

 reared by me from the spindle-shaped gall, described under No. 7 (C. ijiirr- 

 cus coelehs 0. S.). 



From the oak-apple I have also reared the following fly. belonging to the 

 section of Liqnt'/iiix Hartig. I am not certain about the genus, but place it 

 under the head of Sj/itoj'/'i''^'^ Hartig on account of the structure of its abdo- 

 men. (Yet it is to be observed that Si/nojihrus is located by Hartig among 

 the true gall-flies.) 



Synophrus'? laeviventris n. sp. — Head reddish-brown, vertex darker, anteuiiic 

 brownish-yellow, 14-jointed ( 9 )• thorax black, moderately glossy, finely punctate, 

 slightly pubescent; scutellum gibbous, with a recurved, elevated margin and slight- 

 ly reddish at tip; pleurae black, punctate anteriorly, polished and glossy under the 

 insertion of the wing, aciculate below; abdomen shining, chestnut-brown or l)la<^k. 

 paler below, consisting apparently of a single segment, all the following being con- 

 cealed under this ; its anterior portion or neck is tumid and striate ; feet brownish 

 yellow, tips black, hind femora sometimes infuscated ; wings hyaline, veins pale, 

 radial area closed by the prolongation of the subcostal vein along the anterior mar- 

 gin of the wing; cubital vein very slender, almost obsolete; areolet small. Lengtli 

 0.07. 



2. QuERCUS VIRENS. Live Oak. Smali^ghhular galls on the uruh'isf'df 

 of the leaf. Diameter 0.15 — 0.2. 



Pale brownish when ripe ; filled inside with a spongy, cellular mass. 

 which is more dense than that of the preceding gall and not unlike the 



with numerous, dense little grooves (as if scratched with a needle) converging from 

 the eyes towards the mouth; vertex with dense little pits and wrinkles. Thorax 

 finely pubescent, with a distinct, flat, longitudinal furrow in the middle and on 

 both sides with numerous little grooves, similar to those of the head, running oli- 

 liquely towards the central furrow; pleurse with dense longitudinal grooves; scut- 

 ellum with two large, flat pits at the basis, a longitudinal groove in the middle and 

 numerous little pits on both sides. Abdomen pitch-black, shining, with an ex- 

 tremely minute, microscopical punctation near the hind margin of the segments, 

 but not quite reaching this margin, which is smooth : feet brownish-red, coxa? black ; 

 last joint of the tarsi infuscated; wings with a dark brown spot at the basis of tin- 

 radial area; tijDS of the veins not reaching the margin of the wing; areolet trian- 

 gular, distinct. Length 0.25. 



Besides the 14-jointed antennre, the more distinct areolet, the aciculated thoi-ax 

 etc., this species is distinguished from C. confluens by tlie form of its abdomen, 

 which is less rounded above and more abruptly truncated behind. 



