Way, 1S781 205 



NOTE OX DIMOEPniSM AXD ALTERNATION OF GENERATIONS IN 



CYNIPID2E. 



BY J. E. FLETCHER. 



At the beginning of Marct, I confined in a Icno bag five speci- 

 mens of Neuroterus numismatis on a little oak in a flower pot, kept 

 indoors. The oak has now six small but almost fully expanded leaves, 

 and on the mare fourteen unmistakeable galls of Spathogaster vesicatrix 

 — the unquestionable produce of the former insect. 



I have experimented with three other species, but the oak on 

 which I placed one (^Dryophanta scuteUaris) died at the close of winter : 

 the others are as yet uncertain. 



Ilappy Land, Worcestei' : 



April lltJi, 1878. 



NOTES ON BRITISH TENTHREDINIDjE. 

 BY P. CAMEKON. 



Macropiiya eibis, Schr. 

 Thomson (Hym. Scand., i, 253) having reversed the names of M. 

 rihls and M. ajhicincta, Schr., it may be as well to point out their dis- 

 tinguishing points, the more especially, as they are mixed in most 

 collections, a fact no doubt owing to the absence of any mention of 

 the difference in the sculpture in most of the descriptions. The three 

 species of this group found in Britain may be separated as follows: — 



A. Abdomen and pronotum without white markings, scutclhim strongly punctured. 



rihis, Sch. 

 = albicincta, Th., nee Sch. 



E. Abdomen and pronotum with white markings, scutclhim faintly punctured. 



Vertex, scutellum and coxa' with white markings; sides of abdomen black; 

 tcgula; partly black ; ^ with apex of abdomen black beneath. 



alLicincta, Sch. 



= ribis, Th., nee Sch. 



Scutellum and coxre black ; pleura? and abdomen marked witli white ; 

 (J with apex of abdomen beneath white. alhijjuncldln, Fall. 



Albijnmctata is apparently the rarest of the three. Compared 

 with alhicincta, it is small(M', and has the head and thoi'a.v less pilose, 

 the scutellum is black and less cojivex, there are no marks on the 

 vertex ; the mouth and teguL-e are white, the antennai are shorter, 

 while the white marks on the pleurtc form a ready means of separating 



