95 
roth. y. June 14th. 6. June 17th. (A large percentage of the 
eges infertile.) 
(5) 6 (od TZ. bistortata x 9 T. ab. delamerensis) x 9 (8 T. 
bistortata x 9 T. ab. delamerensis). One pairing, June 13th. 
The following pairings of a hybrid with one of the parent species 
were also obtained : 
(6) 8(¢ TZ. ab. delamerensis x 9 T. bistortata) x 9° T. bistortata 
(second brood). Paired June 15th. Only one or two ova hatched, 
remainder infertile. 
(7) & ZL. crepuscularia (second brood) x 9?(¢ TZ. bistortata x & 
T. ab. delamerensis). Paired July 4th. 
The following crosses entirely failed :—(1) ¢(¢ T. bistortata x 3 
T. ab. delamerensis) x 3 (8 T. bistortata x 9 T. ab. delamerensis). 
Paired June rath. (2) 6 (6 T. bistortata x 3 T. ab. delamerensis) 
x 2 (oT. bistortata x 9 T. crepuscularia). Paired June 14th. (3) 
3 (Sb 7. ab. delamerensis x 9 T. bistortata) x 2 (gh T. bistortata 
x 2 TZ. crepuscularia). 
Vv. SECOND GENERATION OF Hysrips.— ¢ (¢ TZ. ab. delamerensis 
x ? distortata) paired with 3 (¢ TZ. bistortata x 3 Tab. delamerensis). 
The parents taken from Dr. Riding’s crossings 11 and 1 above re- 
spectively. Two batches of eggs, hatched June 27th--3oth ; forty-four 
imagines exhibited ; emerged between August 21st and November 
3rd, 1897. It is almost impossible to classify these. 
vi. INBRED Hvyprips.— 4 (9 7. bistortata x 2 T. crepuscularia) 
x 2( ST. bistortata x 2 T. crepuscularia).—Dr. Riding obtained two 
batches of eggs :—(1) Paired August roth; ova laid August rath ; 
hatched during the fourth week of August, some only fertile. (2) 
Paired August 13th; ova laid August 15th ; hatched first week in 
September. By October 22nd, all except thirteen larvee had pupated. 
The first two imagines emerged on November 4th, five full-fed larvae 
at that date not having gone down. Five specimens exhibited, three 
S and two ? ; emerged between November 4th and roth. 
Mr. Bacot obtained two similar crossings, both from parents be- 
longing to his batch 11 a, the parents being in each case normal for that 
brood. a. Pairing took place on June 17th, 1897 ; twenty-two imagines 
emerged, twelve ¢ and ten 2, between the middle of August and 
end of October. 8. Of this brood, eight imagines, four ¢ and four ?, 
emerged during August, and continued until end of October. 
vil 6 (6 2.) brstoriata x 2 T. ab. delamerensis) x 2 (6 7; 
btstortata x 9 T. ab. delamerensis).—The parents of this brood were 
both taken from Bacot’s batch 1. They paired on June 13th, and 
produced, in September, only two small round-winged imagines-— one 
a & (1+ inches in expanse) suffused with ochreous-fuscous, and with 
distinct transverse lines ; the other a ? (11 inches in expanse), whitish 
ground colour, with basal and median bands, and well-developed 
submarginal lines to fore-wings, and median and outer bands to 
hind wings. Both specimens show traces of a fine black longi- 
tudinal line on median nervure at outer point of discoidal cell, and 
