566 Mr. Cameron’s@@otes on Hymenoptera, 
THE BRITISH SPECIES OF THENTHREDOPSIS, Costa. 
I have recently subjected the saws of as many forms 
of T'enthredopsis as I could obtain to a careful micro- 
scopical examination ; and the result of this examination 
has convinced me that many of the forms, which are 
regarded by almost all the recent writers on the subject 
as varieties of one or two species, are, in reality, good 
species. I find that each form exhibits distinct pecu- 
liarities in the shape and arrangement of the teeth on 
the saws; in some cases no doubt the differences are 
slight, but in others they are markedly distinct. The 
form of the saw cannot very well be described in words, 
and I have not attempted to do so here; but in the 
Monograph of the British Sawflies I have now in 
preparation, figures will be given of the saws of the 
species enumerated here. From want of material I 
have not been able to assign the males to their respective 
females in more than eleven species. The following is a 
list of the British species, with descriptions of nine 
species which I consider to be undescribed :— 
1. T' cordatus, Foure. = dimidiata, Fab. 
2. JT’. microcephala, Lep. 
3. T. femoralis, Steph. 
4. T. caliginosus, Steph. 
5. Tenthredopsis nigronotatus, n. s. 
Black ; labrum, clypeus, mandibles, orbits of eyes, a 
spot behind them, scutellum and two spots behind it 
white; legs, and third, fourth, and fifth abdominal 
segments in part bright red; coxe, trochanters, and an 
interrupted line down the centre of the red abdominal 
segments black ; hinder coxe pitchy on lower side in the 
middle ; posterior tarsi faintly fuscous ; clypeus almost 
truncated at the apex. Antenne black, the four or five 
apical segments fuscous beneath. Wings hyaline; 
stigma fuscous, the extreme base white; tegule black. 
Length nearly 6 lin. 
Very similar in coloration to ignobilis, but larger and 
stouter ; antennz and spurs longer ; clypeus yellow and 
not so transverse at apex, and the abdomen has only 
