244 
THE entomologist’s RECORD. 
its posterior margin is coloured continuously with the 12th 
segment, making it look like an appendage thereto, but it is 
really a part of ii, the tubercles being its posterior trape- 
zoidals. The minute tubercles of ii are raised on protuber- 
ances, of which one carries both anterior, and one both 
posterior trapezoidals. The post and sub-spiracular tubercles 
and the marginal tubercles are smaller than the others. There 
are small plates at the bases of the anal prolegs, and there is a 
curious black point in the incision between segments 3 and 4 
in the centre of the dorsum. Comparing with tridens, the 
point on the 3rd segment cannot be found in that species, but , 
the anatomy of the iith is the same; the 4th segment looks 
paler than the 5th, the pale segments are more opaque, their 
whiteness not glassy as in strigosa, the tubercles of the pale seg- 
ments are black or nearly so, and the dark of the dark segments 
includes the supra-spiracular tubercle and is square from seg- 
ment to segment. July 26th. — Newly moulted in 2nd skin 
little difference from ist skin, is still a white larva with dark 
dorsum to the dark segments, whilst tridens of the same age 
is a black larva with sundry markings, and looks solid com- 
pared with the delicate look of strigosa. Both appear to 
regard the skin as edible. July 29th. — When full-grown in 
2nd skin is still very like the larva in ist skin, the pale segments 
are still so pellucid and free from colour, and the dark seg- 
ments are so also, except dorsally, that, had such a larva 
been presented to me, say last year, I should have felt 
positive at first glance that it was still in the ist skin, 
and, even at that, was more glassy, delicate and pellucid 
than any other Acronycta I had seen. Of course recognising 
it as a Cuspidian, I should, on examining it, have been 
thrown into doubt, by noticing that the tubercles possessed 
some pale secondary hairs, just as occur in the 2nd skin of 
tridens^ etc. No Cuspidian (except aceris) having more than 
one hair to a tubercle in the first skin ; the dorsal tubercles 
of 3 and 4 being regarded as double and having two hairs. 
Viininia has several hairs of equal value to a tubercle ; when 
Cuspidia acquires more than one, they are obviously one 
primary, and the others secondary. The other points of 
difference from the ist skin are length 4 mm., a slight indica- 
tion of a dull dark line dorsally in the line of the anterior 
trapezoidals observable in the pale segments, at least on 
their margins contiguous to the dark segments, a broad white 
porcellanous band in the line of the posterior trapezoidals 
