LARViE OF LASIOCAMPA QUERCUS. 115 



X ? quera'is (Dorsetshire). (3) July 10th, <? {viburni x meridionalu, white- 

 haired larvffi, No. above) x ? quercvs (Dorsetshire). (4) .July 18th (A), i 

 meridinnalh, x ? of same stock ("2.2). (.5) July 19th (B), ^ (cihurni x 

 ;H('/7V/i();/((/i.s, brown-haired larvae, No. 7 above) x ? meridionals {j-2). (6) July 19th, 

 <f viburni x ? i-allunac (3-8). (7) July 19th (C), c? (viburni x nieridionalis, 

 white-haired larvae, No. 6 above) x $ viburni (6-3). (8) July 19th (D), c? (viburni 

 X werjVh'oiflZi.s, white-haired larvae) x ? meridionalis (Q-2). (9) July 2.5th (G), <? 

 (vihurni x ?ne?7V?jo«rth'.*, brown-haired larvfe) x ? viburni (7-4). (10) July 28th (/), 

 (? and ? (viburni x meridionalis, white-haired larvte), (0-6). (11) July 28th (.7), 

 <? quercih (Dorsetshire) x ? meridionalis (5-2). (12) July 31st (A'), <? x ? 

 viburni (3-8). (13) Aug. 3rd (L), t? X ? (viburni x ineridionali>< , white-haired 

 larvse) (6-(5). (14) Aug. 3rd (M), s (viburni x meridionalifs, brown-haired larvae) 

 X ? {viburni x meridionalis, white-haired larvse), (7"(i). (1-5) Aug. 7th (.V), <? 

 {viburni x meridionalis) x ? meridionalis (7"2), (16) Aug. 9th (P), g and ? 

 {vibjirni x meridionalis) (7"7). (17) Aug. 12th (R), i meridionalis x ? viburni 

 (2"8). (18) Aug. 12th (S), (j (viburni x meridionalis, brown-haired larv©) x ? 

 viburni (7-3). (19) Aug. 24th (J'), c? sic«?rt x ? meridionalis (9-2). (20) 

 Aug. 20th (?), (V), s siciila x ? {viburni x meridionalis, brown-haired larvse) 

 (9-7). 



An nttempt to cross a <? Pachi/f/a^tria trifolii with a $ L, var. 

 jncridionalis was made ; it is not certain that copulation took place, 

 although a large number of eggs were at once laid (usually a sign of 

 impregnation), but all proved infertile. In all, 23 pairings were 

 obtained, seventeen being distinct pairings and six duplicates. Of 

 the seventeen, four were pairings between moths of the same races, 

 thirteen being crosses between different races. The whole 23 pairings 

 produced fertile eggs. Unfortunately, the difificulties of attending to 

 so many different broods, most of them large, and all of which 

 required to be reared apart in an artificial temperature, and, when they 

 grew larger, of obtaining a sufficient supply of fresh food, proved too 

 much for my limited leisure. Disease resembling diarrhoea carried 

 oft", not only large numbers of each brood, but in some instances 

 entire broods, so that my success as regards obtaining full-fed larvae 

 and imagines was very indifferent. 



During 1898 I only obtained one pairing, this was between a J of 

 the 1897 pairing between <? and ? {vihurni x meridionalis, white- 

 haired larva-) (L) and a 5 siciila. Of this cross I reared a large number 

 of larvje (upwards of 100) until they reached their penultimate skins, 

 when to my great disappointment the above-mentioned disease 

 broke out and nearly decimated the brood. I only succeeded in 

 getting nineteen out of 100 to spin up, while Mr. Prout succeeded in 

 getting fifteen pupse from twenty larvae that I gave him, and as 

 regards emergences he has had a greater number than I. Many of 

 my pupa? lay over in 1899, two males emerging at Whitsun, 1900, 

 while a few are still living (autumn of 1900), and are apparently 

 going to attempt to pass another winter before emerging. j\ly failure 

 I attribute almost entirely to want of attention and the keeping of 

 too large a number in a confined space, especially during their younger 

 stages. I believe that it is in the earlier stages that the disease" is 

 contracted, although its effect may not become apparent until just 

 before the last moult and a considerable time after the larvfe have 

 been removed to ampler quarters. There did not seem to be any 

 weakness resulting from the intercrossing, as is the case with hybrid 

 S)nerinthi(s ocellatiis x popidi larvae, my want of success applying 

 equally to true-bred larvae ; but the tendency to lie over (largely, if 

 not entirely, due to intercrossing) was responsible for much of the 



