Nofe.s* on the Green Bvg in Texa^. 285 



the slack or shrinkage of canvas was easily kept at the proper 

 tension by the adjustment of guy ropes on stakes in the usual 

 way. Further strength and safety was secured by nailing a 

 12-inch ground board to the posts on all the sides and ends 

 except across the space allowed for entrance, and the lower 

 edges of the tent walls were tacked to this board. This con- 

 struction also permitted an additional height of a foot for in- 

 side working room. In size the tent was 12 by 14 feet. 



The ventilation of this tent was accomplished by the re- 

 moval or only partial opening of the gables as desired, this 

 feature being quite important. The gables, in fact, were in- 

 dependent sections that were held in place, when wanted, by 

 means of buggy knobs fixed to the face of the rafters and 

 cross-frame, and with eyes to match on the edges of the sec- 

 tion of canvas itself. As the tent stood lengthwise in a north- 

 and-south direction, with the entrance facing the north, the 

 usual south winds had free range through the open gables and 

 afforded a comfortable temperature inside during the hottest 

 weather. The overhead air currents seldom interfered with 

 the work of transferring young bugs, because the walls con- 

 stituted an effective shield against the generally constant 

 breeze. Strong and equally diffused sunlight was a distinct 

 advantage that no other form of shelter having a darkened 

 roof could possibly permit. Considering all the circumstances, 

 this tent answered the purpose of an insectary quite satis- 

 factorilj% being especially suitable for temporary field work. 



SYSTEM FOR ISOLATED BREEDING OF THE GREEN BUG. 



Two breeding series, one being called the generation series 

 and the other an individual series, were propagated for the 

 purpose of acquiring detailed information upon the phases of 

 development of Toxoptera f/rUminum. In both series a system 

 of designating the isolations of individuals was necessary to 

 prevent confusion. My system as is outlined herewith, if not 

 fully serviceable in so far as was employed for breeding the 

 green bug, may perhaps be adapted for similar work with 

 other aphids. 



The main object in breeding generations was to carry on a 

 lineal series with firstborn from first-matured individuals in 

 order to determine the rate of successive occurrences in 

 different months and in the whole length of time covered. 

 Other particulars, such as developmental, maternal and total 



