98 



Oedaspis gibba — 



Loew, Moil, of N. A. Dipt. Vol. III. p. 200. 



Aldrich, Cat. of the N. A. Dipt. IDCf). p. GOO. 



The deterniiiiMtiou of this 2:all is uiiccrtniii. hut it is probahly Osten 

 Sacken"s T. tjibha. whicli was described from material collected liy Mr. 

 J. Boll, Dallas, Texas, ou Ambrosia sp. Osten Sackeii's description is very 

 short and as follows: "The gall is an oblong swelling of the stem, in-oh- 

 ably terminal." Mr. Creene's Indiana s])criinen was on A. trifiila. 



HEMIPTERIA. 

 AI'HIDAE. 

 I'liYj.i.oxEUA iiEPLANAiw Pergaiide. 

 Phylloxera deplanata — 



Pergande, Aorth American Phylloxeriiiae. 1004. p. 205. 



This gall has been reported from the D. ('. by Pergande, who states 

 that it is A-ery similar to /'. semen "\^'alsh. He describes it as follows : 

 "The leaves of some of the smaller trees are often literally covered with 

 the gidls of deplanata which then produce a sickly, yellowish and crumpled 

 appearance thereof. By the end of June the galls are deserted, brown and 

 dry, or else have completely decayed, leaving innumerable holes in the 

 affected leave.s, seriously aftecting the health of the tree. When but few 

 days old (first week in May) these galls resemble minute yellow specks.' 



"The transverse diameter of the mature galls varies from 1 to 5 mm. ; 

 height about 1 fnm. ; \^alls rather thin above and beneath and semi-trans- 

 parent. Upper surface i)rojecting but little above the plane of the leaf, 

 convex, usually with a shallow fovea : frequently not central and occa- 

 sionally with a slight central elevation. Under side more strongly con- 

 vex, sometimes almost conical, the nipple usually more or less flattened 

 and generally leaning to one side, as if pressed down when young; with 

 the orifice usually oval, though sometimes more or less rounded, and 

 which before maturity is perfectly closed and densely fringed with short 

 pale hairs. Color above either reddish with depression yellowish, or al- 

 most entirely greenish-yellow: below ])urplish. or dull greenish-yellow. 

 Many of the galls are conjoint, i. e., contains from 2 to G or more stem 

 mothers, together with a large number of eggs and sexual individuals, 

 the cavity being completely crowded." 



Pergande reports this gall on llieoria tomentosa. Mr. Greene's speci 

 men was on //. alba. 



