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 11, the tubercles being its posterior trape- 

 zoidals. The minute tubercles of 11 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 tridcns, the 

 point on the 3rd segment cannot be found in that species, but 

 the anatomy of the nth 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. 

 Viviinia 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 



