5 
3rd. It consisted in the different colour of the dorsal coat of short 
hairs or fur. This, in spartii, was light red-brown, while in the 
querciis it was white. The larvae of the English querciis differed 
markedly from both S. of France forms in the 4th or 5th skins. They 
seemed to be quite a moult behind the French races in getting their 
adult skins. The head was dark blue or blue-black, while in the French 
species it was usually reddish-brown, with a white marking on the 
face that was generally absent in the English form, although a few of 
these larvae had a dirty white marking on the face, which, however, 
differed in shape from that on the French larvae. The hairs were also 
much more scanty in the English form, and the long hairs, which in 
the French races were white, were brown in the English larvae. The 
white sub-dorsal line, and the remnants of the oblique stripes, were 
also stronger in the English forms, and there were traces in some 
lame, strongly developed, of a blue line or band just above the sub¬ 
dorsal line, probably a remnant of the blue stripes that are well 
developed in B. trifolii and Clisiocampa neustria, and slightly less so in 
C. castrmsis. The English querciis Mr. Bacot took to be the older form, 
the French querciis occasionally having faint traces of the blue, coming 
between it and spartii, which was more constant, and tended to approach 
B. rubi in the loss of these markings. Mr. Warburg had also very 
kindly given Mr. Bacot a few larvae, the result of a pairing between 
a $ querciis (French) and a 5 spartii. The larvae were now in about 
the 4th stage ; 4 of them had the white querciis coat, 6 the red coloured 
fur of spartii. On a fixed hybernating stage in earv/e of Orgyia 
gonostigma.— Mr. Bacot said that he had placed some larvae of 
Orgyia gonostigma, which had passed the usual hybernating stage 
before the food supply failed, in a cold room, to see if they would 
hybernate. They attempted to do so, fastening themselves in one 
position, which they occupied through October, November, and most 
of December. But they had subsequently died, being unable 
apparently to stand the recent cold, which had had no ill effects on larva) 
hybernating in their normal stage. European and American 
Catocalids. — Mr. Dadd exhibited Catocala fraxini from Germany, 
C. nupta from Wood Green, C. sponsa and C. promissa from the New 
Forest, and C. pacta, C. luciana and C. concumbens from Dakota, 
U.S.A. Hybrid Zyg^enume.— Mr. Tutt then exhibited some hybrid 
Zyg.enids, and read the following notes :—“ It is in the memory of 
you all that Mr. W. H. B. Fletcher has bred hybrids between 
Z. lonicerae and Z. filipendulae, and between Z. lonicerae and .Z trifolii 
(the progeny of the latter proving fertile for four generations). In my 
pamphlet, ‘Notes on the Zygienidie,’ I described fully two very distinct 
Zygtenids, which had been united by Staudinger under the name of 
Z. trifolii var. duhia. These were Zygacna medicaginis and Z. ochsen- 
heimeri, Zell., the former a five-spotted species, closely related to, but 
larger than, Z. lonicerae, the latter a six-spotted species, closely allied 
to Z. flipendulae, aberrations of which have been erroneously referred 
to this species. Whilst we were at Courmayeur (Piedmont), in 1894, 
Dr. Chapman sent eggs of Z. ochsenheimeri to Mr. W. H. B. Fletcher. 
These duly hatched, and when the imagines emerged a $ ochsenheimeri 
was paired with a $ filipendulae from the Sussex Downs (Lewes or 
Shoreham). Eggs were obtained, and a part of the moths resulting 
by the cross I now exhibit. Mr. Fletcher adds that the hybrids (or 
