8o 



BULI.ETIN 64. 



upon low as upon high ground, though the period of flight is 

 longer on high ground. The moths fly more or less during the 

 whole afternoon and during the early evening. During the early 

 part of the afternoon mostly males are taken, while toward dark 

 females are more abundant. 



Trap Lantern Record. C. laqueatellus, 1889. 



This is the only species of Crambus where the number of 

 females taken in a trap lantern has exceeded the number of males. 

 At first thought the trap-lantern would appear to be of use in 

 checking the increase of this insect, but of all the females taken 

 only one was heavy with eggs. The females seem to possess 

 more vitality than those of other species. This insect is quite 

 prolific ; several of the females taken laid over two hundred eggs 

 each, this is probably below the average. 



The eggs hatch in about twelve days. The larvae were quite 

 active, but refused to feed upon timothy and therefore died. 



Egg. — Cream}^ white when first laid, gradually turning to an orange color 

 before hatching. Form subcylindrical ; size .42 mm. by .30 mm. There 

 are sixteen longitudinal ridges and numerous smaller transverse ridges. PI. 

 XII., Fig. 26. 



Larva, first stage. — Head diameter .18 mm.; body diameter .15 mm.; 

 length 1. 15 mm. Head brownish black with whitish hairs ; thoracic shield 

 a light brown ;ibody mottled with pale bright red and bearing blackish tuber- 

 cles. 



ON THE AFFINITIES OF SPECIES. 



As might be expected of a large genus, Crambus includes sev- 

 eral distinct lines of development. In attempting to trace the 

 lines of specialization, the modifications of each organ should 

 receive due consideration. We should go further than that and 

 take into consideration the causes that have led to these modifica- 

 tions. 



