54 TRANSACTIONS OF THE :. Nov. 12, 
rangement of the tubercles as well as of the crotchets on the 
prolegs. They cannot properly be classed with the Saturnina 
on larval characters, though the difference is not fundamental. 
The arrangement of crochets may have been preserved by adapta- 
tion, as the larve are case-bearers. In the Saturnina the un- 
paired dorsal tubercle is not an invariable character. In one 
section it is absent on the 9th abdominal segment, and in one 
genus (Anisota) on the 8th, so that it is not difficult to imagine 
the Lacosomidz to represent the most generalized condition of 
the Saturnina, in which the consolidation of tubercle i. has not 
taken place on either segment. 
In this superfamily, the first larval stage adds nothing to the 
characters of the tubercles of the mature larva, except as show- 
ing the secondary nature of tubercle vi. 
Superfamily ANTHROCERINA. 
Tubercles with single seta, or converted into warts or absent ; 
i. and ii.,as well as iv. and v., approximate or consolidated. 
Formerly I regarded tubercle i. as absent, but, on further exam- 
ination, I am able to correct this statement. Includes the fam- 
ilies Pterophoride, Anthroceridze (—Zygenide, of Hampson), 
Pyromorhidx, Megalopygide and EKucleide. 
SYNOPSIS OF FAMILIES. 
Body cylindrical, feet normal, setze single or converted 
TARIOH OAVERTIES ones nd oie ero oo eyelash re yale ~2+ esse *PTEROPHORIDZE. 
Body more or less flattened ventrally. 
Tubercles converted into warts ; iv +-v distinct. 
Legs normal ; wartsreduced................. eI TE VEE a 
5 ? ? D4 Vig i gee | PYROMORPHID®. 
Two additional pair of prolegs without hooks ;f 
VAIS METI ey wicretencreccharetay costa aera e MEGALOPYGID®. 
Tubercles converted into spinous processes or ab- 
sent ; iv-+-v aborted ; abdominal feet replaced 
by sticky ventral surface................. -.. BUCLEID2. 
Superfamily SATURNINA (Bombycina). 
In a section of this group the primitive first larval stage is 
wanting, the larve hatching in an advanced degree of speciali- 
zation. In the more generalized forms, tubercles with single 
seta, the base usually prolonged into a stiff (often branched) 
*T have recently discovered that the structure of these larve isnot so uniform as I 
had supposed, but I will reserve their discussion for another article. 
+ Deseribed by Sepp in 1830: by Dukinfield Jones in 1878 (Proc. Lit. and Phil. Soe. of 
Liverpool, xxxii, pp. 102-104); by Berg in 1882 (Ann. Soe. Cient. Argentina, XIII, p. 
269), and more recently by Packard, Lintner, Comstock and Chapman. 
