126 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 2 



of the wood of these dimensions is very miTch punctured by crickets^ 

 and encircling many of these wounds are the discolored areas of bark 

 as described. 



This marked difference in the manner of oviposition by the Snowy 

 Tree Cricket, from the common description of the habits of this- 

 species in this particular, prompted some experiments to obtain more 

 data on the egg-laying habits of this insect on apple and raspberry. 

 Fifty-five specimens of niveits reared from eggs deposited in apple 

 bark, and thirty adults collected from raspberries were confined in 

 various lots without mixing in breeding cages, in which were growing- 

 either nursery apples or raspberries. The insects oviposited freely, 

 and more eggs were laid in the apples than in raspberries. In every 

 instance only one egg was inserted in each wound, and the eggs were- 

 deposited irregularly and not in linear series, as with 0. nigricornis- 

 Walk. In similar experiments wdth the latter species {nigricornis) 

 the eggs were inserted in continuous rows, although occasionally single 

 eggs were deposited, the female apparently having been disturbed be- 

 fore a larger number were laid. On young apples of four years of age 

 the eggs of niveus were most abundant about the crotches of the trunks, 

 and larger limbs, while the eggs of nigricornis were deposited in the 

 tips of the new growth. 



The eggs of nivens obtained in the fall are generally pale yellow 

 in color. The chorion has a delicate sculpturing, which is composed of 

 fine lines, which are intersected, forming patches of tiny rectangles. 

 The egg cap is yellowish or light brown, concealed with more or less- 

 pollinose. With magnification it has a honeycombed appearance and 

 from the surface project cylindrical spicules, which are gently rounded 

 at the tips. The measurements of twenty-five egg's gave an average 

 length of 2,871 microns, and an average width at the broadest portion 

 of 645 microns. The average length of the egg caps in this series wa& 

 511 microns and the average width was 521 microns. In the thick 

 bark on the larger limbs and about the base of fruit spurs the eggs- 

 are inserted at an angle of 30° to 45°, while in the thin bark of the 

 younger growth they lie almost flat on the wood. The tissues sur- 

 rounding them become hardened and form a tough, protective ease, 

 from which it is difficult to remove the eggs. In the breeding cages- 

 oviposition commenced on August 20 and continued until August 31. 

 Hatching, of eggs began on May 25 and lasted until June 18. The 

 first adult was observed on July 20. 



The eggs of nigricornis vary from a light to a medium chrome yel- 

 low. The egg caps are cream or a light yellow, with sometimes a tinge 

 of brown on the ends. Examined with a microscope they have a 



