ROEBUCK : ON YORKSHIRE TENTHREDINID^. ' 25 



EXPLANATION OF SIGNS USED. 



! after a locality signifies that I have seen the specimen and 

 have consequently verified the name. A name Avithin parentheses 

 ( ) following a locality is that of the entomologist by whom the 

 specimens were determined, and is not that of the collector. 



Family TENTHREDINID.F—Saivflies. 



The student of this family has at present to labour under the 

 disadvantage of there being no monograph of the British species, 

 although it is understood that one is in preparation for the Ray 

 Society by Mr. Peter Cameron of Glasgow, who is almost the 

 only British student of this group. Consequently the sj^ecies 

 must be worked out for the present by means of isolated descrip- 

 tions and foreign works, of which the latest and probably the 

 most useful is the ist vol. of Thomson's ' Hymenoptera Scandi- 

 navise' (18 71). German works by Hartig ('Die Familien der 

 Blattwespen und Holzwespen' 1837, &c.), Klug, Brischke and 

 Zaddach, and French ones by BruUe and St. Fargeau must also 

 be referred to; also Fallen's papers and the 7th volume of Stephens' 

 'Illustrations,' in which the sawflies and ichneumons are described. 

 Reference may also be made to the descriptions of new species 

 by Mr. Cameron in the Ent. Mo. Mag., Proc. Glasgow N.H.S., 

 and Scott. Nat. during the past few years, to his monographs of the 

 British- species of Cladiiis and Phcemisa (Proc. N.H.S. Glasgow, 

 1876, vol. iii., part i.); and to Mr. May's translations of VoUen-, 

 hoven's descriptions of Sawflies and their transformations given 

 in the Zool. and Entom. for recent years : these accompanied by 

 beautiful coloured plates originally appeared in the Dutch 

 'Tijdschrift voor Entomologie.' 



In their metamorphoses and habits the Sawflies very much 

 resemble Lepidoptera. The caterpillars are very like those of 

 Lepidoptera in form, differing in the number of claspers, the 

 position of the eyes, and the carriage of the anal segments ; 

 they feed on leaves, and may be procured and bred in the same 

 manner. Some of the smaller species are leaf-miners and others 

 are gall-producers. A paper on the caterpillars of sawflies, by 



