1890 ] 
109 
[Packard. 
Ceratocampidae, the young larva on hatching is clothed neither 
with bulbous (glandular) or spinulated hairs, but with tubercles 
of varying size and shape giving rise to spinulated spines. Such 
an armature is evidently adaptive and secondary rather than prim- 
itive in its nature. 
In the Cochlidiae, when the larva is hatched with any setae or 
spines at all they are large stout spines arising from a tubercle, as 
in the Attacidae. Of the hairs of the early larvae of the Psychidae 
we know nothing. 
Returning to the Platyptericidae ; the larva of Drepana arcuata 
in stage i has long, slender, glandular hairs, which are forked at 
the end. 
Among the Notodontidae the freshly-hatched larvae of several 
genera are provided with glandular hairs of various shapes. In Da- 
tana integerrima they are clavate ; in Dasylophia anguina they are 
clavate, somewhat flattened, and are dark but clear at the tip . 1 
While in all the other caterpillars we have observed that the glandu- 
lar hairs are confined to the body, those on the head tapering to a 
point, and apparently not fitted for secreting a fluid ; those on the 
head of Dasylophia are glandular, all ending in a slight, transpar- 
ent bulb. 
Other genera of this group will probably on further investiga- 
tion be found to possess glandular setae in their first larval stages. 
They occur in the freshly-hatched larva of what is probably a spe- 
cies of Heterocampa, also Nadata gibbosa , Ichthyura inclusa and 
Pheosia rimosa. 
It is to be observed that the freshly hatched caterpillars of Ce- 
ratosia tricolor Smith, is provided with glandular hairs. They are 
flattened at the tip which is slightly tridentate, with grooves pass- 
ing down the shaft from the notches between the teeth. They oc- 
cur ndt only on the back and sides of the body-segments, but also 
on the sides of the abdominal legs. The occurrence of such hairs 
in this genus is interesting, from the fact that they have not yet 
been observed in Arctians, to which this moth has been referred, 
nor in the Noctuidse, among which it should be placed, since no 
Arctians have, when hatched, smooth, glandular hairs . 2 
1 Fig. 11. Glandular hairs of Dasylophia; a, of body; 6, of the head; c, of prothoracic 
shield. 
2 Fig. 12. Glandular hairs of Ceratosia tricolor, a, from the second thoracic and first 
abdominal segment; 6, those on the first and second abdominal legs. 
