1861.] <)7 



About 0.4 or 0.5 loiu 



'(•>■ 



These swellings are subconical or club-shaped; they are rounded when 

 they occur on the midrib. In June, they were green, but began to become 

 brownish towards the end of this month. Those of the last year were woody 

 and brown and altogether club-shaped, as the leaf round them was broken 

 off. From this gall I obtained numerous parasites and one gall-fly, belong- 

 ing to the Figitidsc. T would consider it as an Amhlijnotm Hartig, but 

 the second segment of its abdomen is much shorter than the third. In all 

 respects, it is closely allied to the gall-fly which I raised from the gall of 

 C. qitercns tuher Fitch; the antennae ( 9 ) are 13-jointed, the base of the 

 abdomen is pubescent or downy, its radial area is closed etc. Thus, the 

 true originator of the gall remains unknown, unle.ss it is proved that Flg- 

 itidse are sometimes gall-producers. p. 



Amblynotus(?)petiolicola n. sji. — Black, head and thorax somewhat shining, 

 smooth, slightly pubescent, the latter hardly punctate, scutellum rugose; a slight 

 carina between the antennte, mandibles brown, palpi yellow; antennae 13-jointed, 

 yellow, basis blackish; 4 or 6 basal joints of the flagellum elongated; abdomen dark 

 brown, shining; petiole short; second segment short, pubescent at base, third seg- 

 ment more than twice as long as the second; feet infuscated, except at the joints, tar- 

 si pale, tips black; wings hyaline, radial area closed, second transverse vein obli- 

 que, arcuated; areolet corresponding to the middle of the radial area. Length 0.07. 



19. QuERCUS ALBA. White Oa/i. Globular galls of a rorki/ texture 

 on the limhs. Diameter 0.4 — 0.5. Cynips quercus glorulus Fitch. 



"Smooth, globular galls the size of a bullet, growing singly or two, three 

 or more in a cluster, upon white oak twigs, internally of a corky texture, 

 each containing in its centre a single worm, laying in an oval, whitish shell, 

 reseiubling a little egg, 0.15 in length, producing sometimes a black gall- 

 fly with tawny-red legs and the second veinlet of its wings elbowed or an- 

 gularly bent backward, its length 0.15; sometimes a smaller fly ( C. oneratus 

 Harris) of a clean pale yellow color, almost white, with a broad black stripe 

 on the whole length of its back etc, its length 0.12." (Dr. Fitch's Reports, 

 Vol. II, Nos. 312, 813.) 



Dr. Fitch remarks that further researches will probably show that the 

 galls from which these two kinds of flies come, grow upon different parts 

 of the white oak and that the galls themselves will present some differences 

 in their structure. Having obtained the same two species from these galls, 

 I can only say that according to Mr. Hartig's view on the subject, both 

 may be hatched from the same kind of gall. The Gidlaapidia querctis glo- 

 bulus Fitch belongs to the true gall-flies (Psenides) of Hartig; the Q/nips 

 oneratus Harris, on the contrary, is to be referred, on account of the neu- 

 ration of its wings, to Hartig's section oi' Inquilivse. Its radial area is closed, 

 the subcostal vein being prolonged along the anterior margin of the wing^ 



