96 
a small black costal blotch at upper end of the basal line. This latter 
is most marked in two males of Z! crepuscularia (second brood) bred 
by Mr. Bacot. 
vill. HyBRID CROSSED WITH ¢ OF PARENT Race.— 6 TZ. crepus- 
cularia (second brood) x ? (¢ Z: distortata x 3 Tab. delamerensis). 
The progeny is, therefore, three-fourths Z. crepuscularia and one- 
fourth 7: d¢stortata. ‘The female hybrid chosen for this experiment 
was of the de/amerensis form, and taken from Bacot’s batch 1. 
Pairing took place on July 4th. Forty-nine imagines resulted and 
were exhibited, thirty-eight ¢ and eleven 2. These emerged during 
September and October. Only two ? were present among the first 
thirty-seven emergences, and nine among the last twelve. These 
consisted of thirty-one pale and eighteen dark specimens. With the 
exception of seven females, the remainder of this brood are, to all 
intents and purposes, Z: crepuscudarta. Only one who has made a 
very special study of these could tell that the latter specimens had been 
obtained from parents that had been crossed with 7° dzstortata. 
