NORTH AMERICAN HYMENOPTERA. 180 



Calllrhytis seminator begins to develop here, on the small twigs, in 

 A])nl ; by the middle of June the flies are fully devel<)])ed, l>ut they 

 do not escape from the galls until the first week in July. 



14. Ilolcaspifii rii^osa Bassett. 



Cynips ru(\osa Bass., Can. Ent. vol. xiii, p. 100. 



This species was inadvertantly left out of my Catalogue ; Mr. 

 Bassett says it occurs north on Quercus jwmoides, an oak very closely 

 related to the present species. Here, I find it common on Quercus 

 prhius and Quercus bicolor ; it seems to be identical with the species 

 described by Baron Osten Sacken as Cynip-'< juglans, but the fly was 

 not characterized and there is still uncertainty as to its being the 

 same gall. 



The gall begins to develop early in September ; by the last of 

 November the flies are fully matured, but do not escape until the 

 last of December and early in January. By the middle of January 

 nothing remains in the galls but parasites or parasitic larvre. 



1.5. Neuroterus iiiHJalis Bassett. 



Cynips majalis Bass., Proc. Ent. Soc. Phil, iii, p. G3. 



]\Ir. Bassett records this species also from the white oak {Quercus 



alba ; I have found it here on Quercus prinus. 



Galls on the Swamp White Oak (Quercus bicolor). 



This oak is considered by many botanists only a variety of Quercus 

 prinus; galls found on one ai'e very apt to be found on both, and 

 insects are good botanists ; all the galls found on Quercus prinus and 

 recorded above were also found to occur on it. 



The two following species, which are undescribed, seem to be con- 

 fined entirely to this oak, as 1 have not been able to find them on 

 Quercus pjrinus. 



16. Acraspis lana'globtili n. sp. — (The Wooly Globe Acruspis.) 

 (?«/?8.— Round or globular galls, slightly attached to the under surface of the 

 leaf: .30 to .35 of an inch in diameter and covered with a fine, dense, grayish 

 pubescence; internally, of a pithy structure, with a large, thin-shelled kernel in 

 the centre. 



Gall-fly.— 9 . Length .16 to .IS inch. This species in size and general appear- 

 ance very closely resembles Acraspis echini Aslim., but differs as follt)ws: mandi- 

 bles black ; antenuiB brown-black from sixth to terminus, although the fifth joint 

 is also sometimes l)lack or l)lack at base ; the legs are not obfuscated and the 

 l)osterior coxse is vt'ry hairy ; the abdomen at base is pale and the terminal seg- 

 ments are blackish. 



Described from I'ighl $ bred specimens. 



