98 



Ocdaspis gihha — 



Loew. Moil, of N. A. Dipt. Vol. III. p. 2(50. 



Aldrich, Cat of the N. A. Dipt. ]!Xiri. p. 00(5. 



The detonriiiiatiou of tliis icall is uiicci-taiii. but it is i>rubal)ly Osteii 

 Sackeii's T. gihJni. wliicli was described from material collected by Mr. 

 J. Boll, Dallas, Texas, on Ambrosia sp. Osteii Sackeu's de.scriptioii is very 

 short and as follows: "Tlie gall is an obloug swelling of the stem. i>rob- 

 ably terminal." Mv. (Jreene's Indiana s]ic(iinen was on .1. trifida. 



HEMIPTERIA. 



APHIDAE. 



I'UYi.LoxKKA DKi'LANATA Pergaiide. 

 riiyUoxcra deplanata — 



Pergande, North American L'liylloxerinae. I!t04. p. 205. 



This gali has been reported from the D. ( ". by Pergande, who states 

 that it is very similar to J', semen Walsh. He describes it as follows: 

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

 the galls of <h t)lanata which then produce a sickly, yellowish and crumpled 

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

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

 aflrected leaves, seriously affecting 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 mm.; \valls rather thin above and beneath and semi-trans- 

 parent. T'pper surface projecting 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. Tender 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 ]ierfectly 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 (> or more stem 

 mothers, logerber with a largo number of eggs and sexual individuals, 

 the cavity being comjiletely crowded." 



Pergande rejmrts lliis gall on Hintria lomrnto.sa. Mr. Greene's sped- 

 men was on //. iillxt. 



