Hybridising T. bistortata and 7. crepuscularia 38 
B. & (eC 2. bistoriata x 9 T. crepuscularia) x 2 (¢ 
T. lustortata x & T. crepuscularia)—Another brood, the 
male and female parents of which were selected from the 
same batch as the last (Bacot’s Batch, III, a). The parents 
also were normal for that brood. Eight imagines examined, 
4 2 and 4 2 ; emerged from August until end of October, 
Ze aed (thee Males small, the female larger. As in the 
last brood, a tendency to ochreous. The 
female well marked. The last two males 
to emerge more suffused than the two earlier 
ones; one very late tending to the fuscous 
(Perth) form. Otherwise not unlike second- 
brooded 7. bistortata. 
39 Of the same: form as the nine females 
described in the last brood, but with the 
peculiar band-like appearance less strongly 
defined. 
4g 49 
VIL. ¢ (¢ T. bistortata x 2 T. ab. delamerensis) x 9 
(f T. bistortata x 2 Tab. delamerensis)—The parents of 
this brood were both taken from Bacot’s Batch I. They 
paired on June 13th, and produced in September only 
two small, round-winged imagines—1 f (14 in. in ex- 
panse) suffused with ochreous-fuscous and with distinct 
transverse lines; 1 ¢ (14 im. in expanse), whitish ground- 
colour, with basal and median bands, and well-developed 
submarginal lines to forewings, and median and outer 
bands to hindwings. Both specimens show traces of a 
fine, black, longitudinal line on median nervure at outer 
point of discoidal cell, and a small, black costal blotch at 
upper end of the basal line. [This latter is most marked 
in two males of 7’. crepuscularia (second brood) bred by 
Mr. Bacot. ] 
VIII. Hyprip CROSSED WITH ¢ OF PARENT RACE.— 
2 T.crepuscularia (second brood) x 2 (gf TZ. bistortata x 
2 T. ab. delamerensis).—The progeny is, therefore, three- 
fourths 7. crepuscularia and one-fourth 7’. bistortata. The 
female hybrid chosen for this experiment was of the de- 
lamerensis form and taken from Bacot’s Batch I. Pairing 
took place on July 4th. Forty-nine imagines resulted and 
TRANS. ENT. SOC. LOND. 1898—PARTI. (APRIL.) 3 
