86 THE CANADIAN ENTOMOLOGIST. 



studies of these insects. In the case of the three species which fly later 

 in the season, it is possible that they either pass the winter as pupse or do 

 not pupate until spring. 



The most striking thing to be learned, however, from each of these 

 tables is the great disparity in numbers between the males and females 

 caught. The males greatly outnumber the females in every instance. 

 Only about 17 per cent, of the Clisiocampa americaua in Table I. were 

 females. But a little over 6 per cent, of the Feltia subgothica in Table 

 II. were females, while nearly 41 per cent, of jaadifera were of this sex. 

 Less than 12 per cent, of the Lachnosterna fusca in Table III taken in 

 1889, and but little over 6 per cent, of those taken in 1892, were females ; 

 with dubia the proportion of females is greater, being about 32 per cent.; 

 no females of ilicis were taken in either year. 



This great preponderance of the males over the females has also been 

 noticed in every other species of the trap lantern material which has been 

 studied of whatever order. It indicates that the males are much more 

 active than the females, and is of the greatest importance when consider- 

 ing the insecticidal value of the trap lantern. For undoubtedly many of 

 the males have copulated before being caught, and enough others remain 

 uncaptured to fertilize the remaining females. Therefore the perpetuation 

 of the species is provided for, and the insecticidal value of the lantern is 

 rendered too small to be practicable. 



BOOK NOTICE. 



The Butterflies of North America. Third Series, Part XIII. 



Another part of Mr. Edwards's magnificent work has just appeared, 

 and for beauty of illustration and interest of the letter-press, it perhaps 

 surpasses all previously issued parts. The first plate shows the type of 

 Chionebas Chryxus, var. Calais, Scudder, and the accompanying letter- 

 press gives some interesting data collected by Mr. T. E. Bean concerning 

 a similar form found at Banff, in the Rocky Mountains. The second 

 plate shows in full all stages of the rare Canadian species, C. Jutta. 

 This is accompanied by 14 pages of letter-press, in which nearly every- 

 thing that is known concerning this species in America is related in a 

 most entertaining manner. To the Rev. T. W. Fyles, F. L. S., of South 

 Quebec, belongs the honour of being the only person so far who has 

 reared Jutta from the egg to imago and described the different stages. 



