1667. j 103 
lished by the Entomological Society of London, I have of late paid 
considerable attention to these insects. On going over the results of 
several years' collecting, I find some species which I can with confidence 
name as yet unrecorded for Britain, and have accordingly noted them 
below. 
Thanks to the elaborate system of division employed by Hartig, 
the generic separations are comparatively easy,* and the same may be 
said for specific distinctions in many genera ; but the great difficulty 
rests with the numerous species of Nematus and the black Doleri. Eor 
the former genus I find neither the short descriptions by Stephens, nor 
the detailed ones of Hartig, of much avail, but do not yet despair of 
discovering some means whereby the subject may be partially elucidated. 
The black Doleri may yet prove the more difficult. Hartig separates 
numerous species of these by characters which, to say the least, appear 
to me to be of a most uncertain nature, such, for instance, as slight 
differences in the colouration of the leg-spurs. Zaddach, while re- 
marking on the insufficiency of these distinctions, makes yet more 
species, but grounds them on far more important structural diff"erences, 
viz., the forms of the saw of the females. These characters should be 
of the greatest value, but they are very difficult to apply, especially in 
dry insects. 
The Tenthredinidce, as a family in whicli many species seem to be 
absolutely without males, are greatly deserving of the attention of the 
more advanced naturalist ; and the great diversity of structure exhibited 
in the various genera renders them worthy of being no longer left witb 
those groups that have as yet failed to attract the attention of workers. 
Hylotoma metallica, Klug. I took this at Darenth in the spring of 
this year ; and examples are in Stephens' collection mixed with H. 
ustulata. It differs from the latter only in the reddish antennae, and 
more yellowish colouration of the basal veins ; but I do not feel at all 
sure that it is more than a variety of ustulata. 
Lopliyrus frutetorum, Fab., Klug. A single ? example was taken 
at Eannoch, by Mr. Hislop, during the time we were there in June, 
1865, and was kindly presented to me by that gentleman. It affects 
Pinus sylvestris. 
Harpipliorus lepidus, Klug. I beat one example from an oak tree 
near Croydon, on the 30th May, 1867. It is the only European species 
of the genus. _ 
* Whilst paying this tribute of admiration at the lucid manner in which Hartig has divided the 
family, I cannot, at the same time, sufEciently condemn the plan he follows in making numerous named 
sub-genera, divisions, sections, &c., almost ad infinitum, subordinate to what he calls a "genus." 
Succeeding writers have mostly considered eacli of these as a genus in itself, which accords with my 
own views, that a, division of any kind, if worthy of a name, should be looked upon as generic. 
