. 
Hairs of certain Lepidopterous Larve. 373 
refers to the larva of Acronycta alni as much resembling 
both in colour and in its clavate hairs the larva of Z¢nolius,” 
the latter being figured on pl. xi.; the large, strong, clavate 
hairs of this form, Ténolvus eburnetgutta, Walker, which is a 
semilooper, and from its black colour a very conspicuous 
animal, are represented as being from one fourth to one third 
as long as the body and are situated on the first two or three 
segments of the abdomen, this being the most prominent part, 
forming the loop when the creature is in motion. ‘T’hese are 
the only cases known to me of the occurrence of flattened hairs, 
with the exception of the case described by Burmeister and 
quoted below. 
Scale-like Sete.—In examining the median dorsal tufts on 
the second and third thoracic seg- 
ments of the European Gastropacha 
guerctfolia I found that they are com- 
posed of broad lanceolate-oval scales*, 
which are opaque and dark steel- 
purple in colour, with the surface 
quite regularly striated, though not 
invariably so, while the striz do not 
appear to extend toeither end. They 
vary in shape and in size, some 
being narrow and with a simple 
point at the distal end, while the 
majority are variously notched or 
toothed. ‘They thus appear to be Scales from the dorsal 
true scales, like those on the wings PROTACIC LIEU Oa 
: tropacha quereifolia. 
of adult Lepidoptera. 
In Gastrepacha americana the scales forming the dorsal 
tufts, both on the two hinder thoracic segments and on the 
eighth abdominal one, are very different from those of the 
European species ; they are dark and opaque, but are long, 
narraw, and flat, very gradually increasing in width to the 
end, which has a single notch. From this notch an impressed 
line or stria extends along the middle of the scale for some 
distance. 
Sete flattened at the end.—In Gastropacha quercifolia the 
lateral tufts along the body each contain a few long hairs with 
flattened ends, varying in shape from oval to triangular, with 
the ends often very broad and ragged, bearing from one to 
* These scales were briefly referred to in my article entitled ‘ Hints on 
the Evolution of the Bristles, Spines, and Tubercles of certain Cater- 
pillars,” Proc. Bost. Soc. Nat. Hist. xxiv. p. 512, 189 (1890). 
Ann. & Mag. N. Hist. Ser. 6. Vol. ix. 28 
