1910.] 233 



oTeyish on their oiitor half ; before the middle of the cell commences a dirty 

 wliitish line which runs to the apex, leaving- a broad band of the dark gronnd- 

 coloiir above it ; a second line commences at the base and accompanies the fold 

 to the dorsnm beyond the middle, and a few whitish scales occur about the base 

 of the dorsum ; cilia lirownish grey, with a line of dirty whitish scales along 

 their base ; ( V some^vhat paler than the S , '^ dorsal as well as a costal white 

 line being clearly indicated throughout, the markings are also somewhat more 

 clearly defined). Ex'p. al. 8-11 mm. Hindu-ings pale grey ; cilia brownish grey 

 Abdomen dirty whitisli, with some grey shading. Legs whitish, the hind tibiae 

 with long brownish grey hair-scales. 



Case pale brownish, darker along the central portion ; formed of small 

 portions of the mined ends of the leaflets, wider anteriorly and tapering pos- 

 teriorly. The points of the leaflets are separated irregularly on either side, 

 giving the case a caariously hirsiite appearance ; it is somewhat flattened and 

 the projecting leaflets are lateral, not disposed all round the case. 



Type S (85279) ; ? (85280) Mas. Wlsm., B.M. 



Hah.: S. France: {Pyr. or.): Tliiies-les-baius, Achillea 'mille- 

 folium, VI, ex. 13-28.VII.1900 {Wlsm.). Eiglit specimens. 



Tliis species is most nearly allied to 3653 bifrondeUa Wlsm. 



(To he continued) . 



HELP-NOTES TOWARDS THE DETERMINATION OF BRITISH 

 ' TENTHBEDINID^, &c. (27). 



8CI0PTERYX, RH0G0GA8TER, PERINEURA, PACHYPROTASIS. 



BY THE REV. F. D. MORICE, M.A., P.E.S. 



(Continued from 'page 159). 



After wrestling- to the best of my power with the difficulties 

 attaching to specific determinations in the genus Dole-rus, it is quite a 

 relief to devote a paper to a few " short " genera, whose species are 

 distinguished by such characters as make their recognition and tabula- 

 tion compai atively easy. We have ari"ived now at the last Tribe in 

 Konow's system, called by liini the Tcnthredvnes, but better, perhaps, 

 bv Thomson the Tenthredinides ; and of the genera compi'ised in it one 

 only {Tentliredo'psis) , which I reserve for later consideration, presents 

 any serious difficulty to the student, so far as British insects are 

 concerned. 



Scioptery.r, Stephens. — We have two species of this genus, much 

 resembling each other, and superficially so like the common Allantus 

 arcuahis, that they may perhaps occasionally escape collectors in con- 



