1877 



177 



Nernatus longiserm, Thomson, Opusc. Ent. 632, 39; Hymen. Scand., 

 i, 128, 55. — -The only British specimens that I have seen of this insect 

 are a ? aiid (^ which I bred from larvae found on Salix caprea, at 

 Glenelg, in 1874 ; these larvae having been collected in the belief that 

 they were those of N. his trio, which I discovered on the same bushes 

 two years before (see Ent. Mo. Mag., xi, 65). From this, it will 

 follow that the larvae of longiserra cannot differ much from those of 

 liistrio, or otherwise I should have noticed it, as I am well acquainted 

 with the larvae of the latter species ; and it will be equally clear that 

 longissera cannot be the Tenthredo niqrata, Eetz., a willow feeder, as 

 Thomson seems to suggest. Longiserra is easily known from histrio 

 by its having the last abdominal segment considerably lengthened 

 above. 



JVematus hilineatus, Klug. — From the remarks of Professor 

 Zaddach in the above-quoted work, it appears that the supposed var. 

 of iV\ luteus, with black marks on the thorax, which I described last 

 year in this Magazine (xii, 130), is in reality hilineatus, which is a 

 distinct species from luteus, as is proved by its having a different 

 larva ; though it is very like that of luteus in form and habits, yet 

 being easily distinguished by the number of tubercles, &c. It is also 

 stated by Zaddach that N. Klugi, Dbm., is not hilineata (which was 

 described by Klug, Wiedemann's Zool. Mag., ii, 86) ; and in this case 

 the name of hilineata must of course be retained. 



The British species of the luteus group may be distinguished 

 as follows : 



A. — Head and thorax black ; -wiugs deeply infuacated. — aldominalis, Pz. 



B. — Head and thorax for the greater part luteous. 

 a. — Abdomen broad at apex. 



Mesonotum immaculate, stigma bhick at base, wings deeply smoky. ^ 

 mesonotum black. — luteus, L. 



Mesonotum with two or three black marks, stigma scarcely black at base, wings 

 slightly smoky, <? thorax luteous. — hilineatus, Kl. 



h. — Abdomen narrowed at apex, stigma usually unicolorous, dorsum of 

 abdomen with black bands, breast luteous. — dorsatus, Cam. 



Nematus pallescens, Htg. — I have taken in Caddcr Wilderness 

 the undescribed ^ of this species. It has the antennae thicker and 

 longer than in the $ ; the vertex is black ; there are three black 

 marks (nearly joined together) on the mesonotum ; the metanotum is 

 black ; the scutellum at the edges is also marked with black ; and 

 there are broad black transverse marks across the back of the 

 abdomen : the stigma is obscure testaceous. 



