NOTES ON THE WAVE MOTHS. 47 



structures are glandular, and I cannot help wondering whether 

 they are akin to what Mr. Burrows calls " battledore processes " 

 in the larvae of the " Emeralds," though I understand him that 

 these are not homologous to the true larval setae. Most, if not 

 all, of the Acidaliid larvae have the skin decidedly rugose in 

 appearance, subsegmentation distinctly marked, and generally a 

 more or less well-developed lateral flange. 



Earlier in my paper I spoke of the two large genera into 

 which — excluding ockrata and perhaps rusticata and fumata — 

 Meyrick and others find our imagines divide according to neura- 

 tion and leg-structure ; and I have stated or hinted two or three 

 times in its course, that these seem to be roughly correlated with 

 some of the more striking larval differences. Ever since the 

 Acidaliid larvae have been at all systematically described — i. e., 

 since the time when Buckler and Hellins were at work — it has 

 been customary to speak of the " short broad Acidalia type " and 

 the " long thin." Now it is noteworthy that the larvae of all the 

 British species which fall under Meyrick's Leptomeris — namely, 

 remutaria, immutata, marginepunctata, ornata, imitaria, emutaria, 

 strigilaria,immorata, and rubiginata — belong most distinctly to the 

 " long thin" group ; and so do such non-British ones of the same 

 genus as I have had under observation {incanata and strigaria), 

 or as are known to me from figures and descriptions by Milliere, 

 &c. The least unequivocal— to judge from the figures — is that of 

 L. ornata, and this, with its allies, has been placed into a distinct 

 section by Lederer, on account of the indentations of the margin 

 of the hind wing between veins 4 and 6, and would, perhaps, 

 form the type of a natural genus — Craspedia, Hb. There are, 

 of course, other larval characters which go with this "long thin" 

 group, such as the nearly cylindrical form, the comparative free- 

 dom from rugosities, the extremely short setae apparently seldom 

 developing, in the later stages, into the clavate forms, &c. 



The bulk of the remaining species — Meyrick's genus Eois — 

 have quite a different type of larva, short and thickened — 

 especially posteriorly, more or less flattened, very rugose, gene- 

 rally comparatively hairy, the hairs often knobbed at their 

 extremity. But I fancy they are less homogeneous than the 

 Leptomeris group, and will need careful revision. A few seem 

 almost to form connecting links between the group in which their 

 imago would place them and Leptomeris ; P. virgularia, for 

 instance, has not very much of the typical Ptychopoda character, 

 and even P. hisetata, P. straminata, P. subsericeata, &c., make 

 some approach to the intermediate form. Still, I do not think 

 any of them are capable of assuming the spiral coil characteris- 

 tic of true Leptomeris,* and they all show some approach to the 



"-■''• P. virgularia may be an exception, as some small, but by no means 

 newly-hatched, larvae kmdly given me by Mr. South since this paper was 

 written, show a strong predilection for the Leptomeris attitude. — L. B. P. 



P 



