58 THE ENTOMOLOGIST. 



I took special pains to satisfy myself on this point, and went over several 

 trees repeatedly at intervals, the reason being to throw light on the 

 dimorphic theory, if possible ; if A'', lenticularis is only the agamous 

 generation of S. haccarum — of which I do not feel satisfied either pro or 

 con — it ought to occur. On the North-American oaks planted largely — 

 especially Q. rubra, coccinea, Phellos, aquatka, iiujra, and j^alustris — I only 

 found one gall, and that none of the foregoing; it may be new to Britain, 

 and is on the upper side of the leaf. With Q. cerris the same thing 

 occurred ; it would perhaps be unworthy of note, except that in two or three 

 instances galled branches oi Q. Robur touched those of that species, thereby 

 giving every facility for spreading to it. 



The foregoing notes are offered as a small contribution to our 

 knowledge of gall-distribution; though obviously incomplete, — 

 many species being absent altogether, a fact partly attributable to 

 neglect of the species which appear in early spring, — still I hope 

 they are sufficient to show what an interesting field presents 

 itself for research. The oaks have all been compared with 

 specimens in the Kew Herbarium to avoid errors in nomenclature, 

 a point T would urge as important in future observation. 

 Excepting a few of the galls found on varieties of Quercus Rohur 

 and that of Aphilothrix gemmce on Q. glanduUfera, all are now 

 in my collection. I hope next season to pursue the subject 

 further ; should anything of interest occur, it will form matter for 

 future notes. 



Royal Herbarium, Kew, Surrey, Dec. 8, 1880. 



INTRODUCTORY PAPERS ON ICHNEUMONIDM. 



By John B. Bridgman and Edwakd A. Fitch. 



No. II.— ICHNEUMONID^ {continued). 



The Ichneumones amhlypygi have been tabulated by Holmgren 

 as follows : — 



A. Abdomen oblong or oblong-ovate, depressed, or towards the apex 



slightly compressed. 

 a. Abdomen of female showing 7 segments, the 8th not exserted ; 



antennae of male not having the flagellum externally dilated. 

 ■'■• Tbe legs, in relation to their relative lengths, normal. 

 f Scutellum moderately convex. 

 I Apex of clypeus truncated. 



§ Tarsi setose beneath. - - - Gen. 2. Amhhjteles, Wesm. 



§§ Tarsi with very short pubescence, especially in the females ; no 



bristles, or next to none. - - Gen. 3. Hejpiojyelmus, Wesm. 



II Apex of clypeus subangulated. - Gen. 4. Acolohus, Wesm. 



