Packard ] 
108 
[May 7, 
erally noticed and carefully figured except by Scudder in his great 
work on the Butterflies of the Eastern United States. In the three 
exquisite plates of the larvae in their first stage, after drawings 
mostly by Mr. Emerton, it appears that out of sixteen freshly 
hatched larvae of the Nymphalidae, six possess at birth glandular 
hairs of various shapes ; of five Lycaenidae, three have them ; of five 
species of Papilio, only one (P. cresphontes) is provided with them ; x 
of three Pierinae, all possess them ; while of nine Hesperidae, six 
have them, and they are absent in three, unless their nature was 
overlooked by the artist. It thus appears that they occur in the four 
families of butterflies, but are not universally present, and that 
they are probably adaptive characters. 
From the observations and drawings of Weismann and of Poul- 
ton it does not appear that they are present in the first larval stage 
of the Sphingidae ; although Poulton 2 represents the two setae on 
the end of the “caudal horn” of Sphinx convolvuli as being swollen 
at the end . 3 
In the first stage of the Agaristid genus Copidryas glover i, kindly 
given me by Professor Popenoe, the hairs all taper to the end, and 
do not appear to be glandular. Of the earliest stages of the Sesiidae, 
Thyridae, Cossidae, Hepialidae and Zygaenidae we know so little that 
it is not possible to state whether temporary glandular hairs appear 
in these groups or not. 
Of all the groups or families of Bombyces I have only found 
glandular hairs in the first larval stage of the Platyptericidae and 
Notodontidae. In the Arctiidae and Liparidae, the hairs of stage 
i are spinulated, a single hair arising from a wart, more hairs 
appearing after the first moult. This I have observed in species 
of Arctia, Hyphantria, Seirarctia, Halesidota, and in the Liparid 
genera Orgyia and Parorgyia. 
I have observed in the first stage of Clisiocampa americana that 
the hairs are tapering and very finely spinulated, and judge that 
this will be found to be the case in the earliest larval stage of La- 
siocampidse in general. 
In the first larval stages of nearly all our Attaci (Saturniidse) , 
glandular hairs occur. But in the Hemileucini, and in the group 
1 Mr. W. H. Edwards figures glandular hairs in the young larva of Papilio rutulus, 
var. arizonensis. 
2 Trans. Ent. Soc. London, 1888, PI. xv, fig. 4. 
3 Since this paper was sent to the printer we have found them in stage I of Deidamia 
inscriptum and Ampelophaga myron. Psyche, v, 397, 400. 
