374 Scale-like and Flattened Hairs of Lepidopterous Larve. 
four very irregular teeth. No strie are perceptible, and the 
hairs throughout are pale, colourless, and transparent. 
On examining the lateral tufts of Gastropacha americana I 
found some similar very long hairs with the ends flattened 
and of extraordinary form. These hairs usually project 
beyond the simple hairs; some of them end in regular lanceo- 
late-oval shapes with the point much attenuated, others are 
broader, while some are oval and very broad at the truncated 
end, which terminates in a fine attenuated point, at the base 
of which are usually three attenuated teeth. They are 
similar in shape to those of Gastropacha quercifolia. 
On turning over the beautiful plates of Burmeister’s ‘ Atlas 
of the Lepidoptera of the Argentine Republic’ I found that 
the author represents on pl. xxii. fig. 9 the similar long hairs 
of Clisiocampa proxima. They are much more regular than 
any I have seen, and are much flattened and expanded at the 
ends, with from three to five long slender teeth. They are 
also represented as striated longitudinally, with either beads 
or clear spots in the expanded portion, These hairs are 
visible to the naked eye. Burmeister remarks (p. 52) that 
Stoll has figured (Suppl. de Cramer, pl. xix. fig. 5) a similar 
larva with the same kind of hairs, & palmette terminale, 
situated on the first and last segments of the body. Henames 
it Bombyx ephomia (pl. xxxv. fig. 6, of the same volume). 
Walker refers this species with doubt to the genus O.ytenis. 
Burmeister adds: ‘ Some other species of the genus Clisto- 
campa have the same kind of hairs placed at each end of the 
body.” 
1 have been unable to discover these flattened hairs in 
Clisiocampa americana or in C. neustria of Europe. In 
C. sylvatica the hairs on the lateral thoracic tubercles are 
tapering and finely barbed, with scattered, slender, spike-like, 
smooth, simple sete. Perhaps the latter are the homologues 
of the flattened sete. In Heteropacha Rileyana of the central 
United States there are no dorsal tufts, and consequently no 
dorsal scales like those of its ally Gastropacha; but certain 
of the hairs in the lateral tufts are flattened at the end, which 
is very long and slender and lanccolate-oval, with the tip 
much attenuated *, 
In the Noctuina these hairs with flattened ends probably 
occur in nearly all the hairy and pencilled species. In the 
* In Tolype velleda there are no such scales or hairs with flattened ends 
as in Gastropacha; those on the dorsal tubercles of the thoracic and eighth 
abdominal segments being simple, tapering, with large, scattering, spile- 
like, dark, opaque setz, these latter being perhaps the homologues of the 
dark scales of G'astropacha. 
