'«9^-] 399 [Oyar. 
Humped Notodontians with processes on joints 5 and 12, some- 
times also on 8 and 9, the one on joint 5 often furcate and 
nutant; anal feet uplifted. Rest on the edges of leaves and 
resemble the foliage except in one instance. ^ 
Processes on joints 5 and 12 reduced, rounded. 
Conspicuously marked, brownish, with hump on joint 5 
and head red ; tubercles produced, black : larvae gre- 
garious concinna. 
Largely green, resembling the green foliage ; tubercles 
obscure : larvae solitary .... nitida. 
Processes on joints 5 and 12 well developed, that on 5 with 
furcate tip : larvae solitary, resembling withered or 
distorted leaves. 
Sides of thorax marked with green ; V-mark conspicuous. 
A large white dorsal patch on joints 5-8 ipomoeae. 
Without white patch . . . unicorms. 
Sides of thorax not green ; V-mark pinkish, tending to 
become obscure. 
Process on joint 5 moderate ; a broad dorsal band 
on thorax and a distinct lateral line on 
body ..... leptinoides. 
Process on joint 5 long with a supplementary one on 
joint 4 ; dorsal band on thorax narrow ; lateral 
line obsolete eximia. 
Family Thyatiridae. 
With the exclusion of Leptina from this group, as pointed 
out by Prof. J. H. Comstock, the remainder form a small, com- 
pact family allied to the Xotodontidae, but with affinities also 
with the Noctuidae. Four genera occur in our fauna, accord- 
ing to Prof. J. B. Smith's catalogue. Of these the larvae of 
three are known ; they are smooth, noctuiform in appearance, 
unrelated to the genera at the head of the Noctuid series (Bom- 
bycoidae) with which they have been associated. The arrange- 
ment of the setiferous tubercles has not been described ; but I 
find from an examination of the two species known to me, that 
iThis diagnosis apijlies equally well to Hyparpax aud lanassa. 
