1907] 
SOULE — SOME EXPERIMEXTS WITH II V HR IDS 
117 
May 27th, 9 R. jonilla and cJ' recropla mated; many eggs were laid hnt proved 
infertile. 
May 2Stli, 9 hybrid mated c? pronifthm hut the many eggs were infertile. 
May 30th, 9 hybrid and pnrmethea, no eggs. 
“ “ 9 recropia and jorulla, many inh'rtile eggs. 
May 31st, 9 hybrid mated c? prornelhea but tlie eggs failed to luiteh. 
•Tune 3rd, anotlier similar ]>air mated but no eggs were laid. 
■fune 14th, 9 polijphnnux mated c? pronnihea and laid many eggs, infertile. 
■June 16th, 9 pmmiihm and small c? recropia mated. Over 200 infertile eggs 
were laid, and the ]>air mate<l a seeond time. Xo eggs. 
June 17th, another .similar p;iir, with many infertile eggs. 
June 17th, 9 prornelhea mated o’"' hybrid, many eggs were laid; remated, 
and more eggs were laid, all infertile. 
June 29th, 9 II- hudleyi and (J' eipithla mated, a few iTifertile eggs were laid. 
July 3rd, 9 cijnihia mated c? budleiji, many infertile, eggs were laid. 
June 19th, 9 jornl/n mated c? prornelhea and laid many infertile eggs. 
June 20th, 9 jorulla and c? ceeropia. Many infertile eggs. 
June 22(1, 9 prom-dhea mated d’ jorulla and laid infertile eggs. 
June 23rd, 2 jorulla mated S' prornelhea and laid many infertile eggs. 
As in former experiments my results dilfer from l\Ir. Joutel’s, in that my moths 
seem to mate more readily, and to ovi])osit, in most eases, more freely. 
June 29th, 9 et/iilhia mated S biidleyi and laid many eggs, two of whieh hatehed 
on July 21st, but died before moulting. 
July 3rd, 9 biidleyi and (d' cynihia mated, a few infertile ('ggs. 
July 9th, two ()airs 9 cynihia mated prornelhea SS attracted by a 9 pro- 
melhea near the window. 
Fertile eggs resulted but the larvae died from the cherry. 
July 18th, 9 prornelhea mated S' S- rjordin.i, apjnirently normally, and laid 
many infertile eggs. 
From this experience I think that cynihia and prornelhea will mate any other 
species, and ceeropia has mated with every species j)rovided so far. 
Polyphemus SS have been attracted to a dark window by 9 9 of cynihia, 
prornelhea, and ceeropia on several occasions, no 9 of their own kind being in the 
room. 
