60 [October 



brownish-ferruginous, base of first joint black ; thorax finely pubescent, punctation 

 exceedingly fine and indistinct; lower part of pleurae smooth and shining; scutel- 

 lum gibbous, rounded, deeply rugose ; metathorax with two parallel, longitudinal 

 carinas; petiole short, slightly tumid, striate; second segment of the abdomen dis- 

 tinctly shorter than the third, downy on both sides, near the base; third segment 

 very broad, especially beneath, occupying half of the abdomen, or more ; the follow- 

 ing segments very short ; feet jJale yellow ; base of coxpe and tip of tarsi black ; wings 

 hyaline, thick veins pale, areolet present, although indistinct; anterior portion of 

 the cubital vein almost obsolete ; second transverse vein very oblique, slightly arch- 

 ed; radial area somewhat elongated, closed. Length about 0.14. 



6. QuERCUS OBTUSILOBA. Clusters of yellow^ tuhular gnJls with red 

 spines, on the unrlerside of the leaves. Cynips quercus tubicola n. sp. 



The gall is a perpendicular tube 0.3 to 0.4 long, slightly narrowed at it.« 

 point of attachment, open at the other end, yellowish and covered on its 

 outer surface with numerous red spines. If cut open longitudinally, its 

 inside appears divided into three compartments like so many floors, by two 

 horizontal partitions; the compartment nearest to the base is empty, the 

 intermediate one contains the insect and the third one is open at the top. 



If the red spines are removed with a knife and the surface of the gall 

 examined under a strong lens, it shows dense longitudinal fibres and nu- 

 merous little pale yellow crystals. The substance of the gall itself is hard, 

 as if crystalline. From 30 to 40 of these galls are found sometimes on the 

 underside of a single leaf. I frequently found them near Washington, in 

 October and obtained the fly soon afterwards, each tube containing a sin- 

 gle fly. 



Cynips tubicola n. sp. — Chestnut-brown, darker on the abdomen, or, in imma- 

 ture sjiecimens, the whole body reddish-brown; antennre 13-jointed, basal joints 

 brownish, the remainder black; feet yellowish brown, tips of tarsi black; thorax 

 slightly pubescent; wings hyaline, subcostal and radial vein dark brown, areolet 

 triangular, middlesized; second transverse vein very angular, j^ortion of the cubi- 

 tal vein anterior to the areolet indistinct. Length 0.12. 

 I obtained numerous $ of this fly. 



7. Quercus rubra. Red Oak. Elonjj<(tcd , fusiform, pale (jreen (jull. 

 with a pedicel, inserted on the ed<je of the leaf and hcimj the preAonrjation 

 of a leaf -vein. Length about an inch. Cynips quercus C(ELEBS n. sji. 



The pedicel is about 0.15 — 0.2 long; the gall itself is an elongated, sub- 

 cylindrical body, tapering on both sides, O.G or 0.7 long; its apex is slen- 

 der, about 0.1 or 0.15 long, I have found three specimens of this gall 

 near Washington, in June; two are inserted on the margin of the leaf, not 

 far from the stalk; the third is on the leaf-stalk itself, but so that on the 

 side of the gall the leaf originates about half an inch above its place of 

 insertion, whereas on the other side the beginning of the leaf corresponds 

 exactly to the place of insertion of the gall-stalk. In all the three cases. 



