A NEW SPECIES OF TOXOPTERA. 



15 



MORTALITY OF EGGS. 



For sonio cause or other the eggs appear never to hatch welL 

 During the fall of 1008 from 50 to 100 eggs were collected; and in 

 1909 fully 1,000 were obtained, but not a single egg hatched, though 

 they were treated in the same manner as eggs of T. graminum and 

 other species that stood the winter in good shape. During the spring 

 of 1910 eggs were found by the thousand in the open fields with every 

 evidence that not more than one-half to 1 per cent had hatched, though 

 no unusual circumstances seemed in 

 anv way connected with them. 



REARING METH- 

 ODS. 



As the Section 

 of Cereal and 

 Forage Insects 

 has been rearing 

 grass and grain 

 infesting aphides 

 for over four 

 years out of doors 

 a brief summary 

 is given of the 

 methods em- 

 ployed, in the 

 hope that future 

 workers on these 

 nsects may find 



some useful SUg- Fig.S.— Lamp-chimney gen- 

 eral ion cape used in rearing 

 aphides. (Original.) 



, Fig. 9.— Lamp-chimney stoclc cage used in 

 rearing aphieds. Original.) 



gestions. 



The rearing 

 stand (PI. I) consists of a shelf 2 feet wide of tongue-and-groove 

 J-inch boards, supported by a frame or base made of 2-inch 

 by 4-inch material. These bases extend up above the shelf 20 

 inches and support a gable roof of lapped si(Hng. The shelf is 2 

 feet from the ground. One side is closed by a hinged door that may 

 be raised in case of a storm to prevent the cages from being blown 

 over. This stand should be placed in the shade, ])referably of trees, 

 with the hinged side toward the direction from which the j^revailing 

 storms come. When it is not storming the hinged door should be 

 let down to permit of free passage of air. It is also well to ])lace a 

 thermograph on the shelf with the cages in order that continuous 

 temperature recoids may be secured. 



