1890.] 
513 
[Packard. 
2. Smooth, subspherical warts. (Zygsenidse, e. g., Chalcosia, East In- 
dies) ; or elongated but still smooth. (. Attacus atlas and a species 
from southwestern territories U. S. A.) 
3. Subspherical or clavate, spiny tubercles of many Attaci ; the spinules 
usually short. 
4. Spinulated spines or elongated tubercles of Ceratocampidse and Hem- 
ilucini. ( H . io and H. maia, etc.) 
5. Spike-like hairs or spines. ( Sarnia cynthia, Anisota, East Indian Hyp- 
sa, Anagnia.) 
6. Antler-like spines. (Early stages of Heterocampa guttivitta.) 
B. Setms (“ hairs,” bristles, etc.). 
1. Simple, fine, short or long, microscopic or macroscopic setae, taper- 
ing hairs, scattered or dense, often forming pencils. (Many Bom- 
byces, Zygaenidae, Noctuo-bombyces, Apatelae.) 
2. Glandular hairs, truncate, spindle-shaped or forked at the end and se- 
creting a more or less viscid fluid. (Many in stages I and II of No- 
todontians, many butterfly larvae, and in the last stages of Ptero- 
phoridae.) 
3. Long, spindle-shaped hairs of Apatelodes, Apatela americana , figured 
in Harris Corr., PI. hi, fig. 2, also Packard’s Guide, fig. 236, and the 
European Tinolius eburneigutta Walk. 
4. Flattened, triangular hairs in the tufts or on the sides of the body of 
Gastropacha americana , or flattened, spindle-shaped scales in the 
European G. quercifolia. 
5. Spinulated or barbed hairs. (Most Glaucopides, etc., Arctians, Litho- 
sians and Liparidae and many other Bombyces.) 
C. Pseudo-tubercles. 
1. The filamental anal legs (stemapoda) of Cerura and Heterocampa mar- 
tliesia. 
2. The long, suranal spine of Platyptericidae. 
THE USUAL POSITION OF THE MORE SPECIALIZED WARTS, HUMPS OR 
HORNS. 
Everybody has noticed that the horn characteristic of larval Sesise 
and Sphinges is uniformly situated on the back of the eighth ab- 
dominal segment and no other, and that when it is absent, as in 
Choerocampa, etc., it is replaced by a small, low and flattened tu- 
bercle, the segment itself being somewhat swollen. The larval Aga- 
ristidse (Alypia, Eudryas, Copidryas, Psychomorpha, etc.) have a 
prominent, gibbous hump on this segment, or at least this seg- 
ment is more or less prominent and humped, not only in this fam- 
ily, but also in certain smooth-bodied Noctuidse, as Amphipyra, 
and Olygia versicolor , etc. 
PROCEEDINGS B. S. N. H. 
VOL. XXIV. 
33 
JUNE , 1890. 
