NOV., 'o6] ENTOMOLOGICAL NEWS. 327 



Texas Notes. — II. 



By E. Dwight Sanderson. 

 The English Grain Louse. 

 Macrosiphum granaria Buckton. 



This species was found common in the grain fields of north 

 and central Texas. The species was first sent us from North 

 Texas, January 20, 1903, where it had been mistaken for the 

 southern grain louse (Toxoptera graminum), other specimens 

 were similarly received during February and March. 



Colonies were started in tubes in the laboratory January 

 21, 1903, and progeny from them were maintained until about 

 May 1st. Conditions were hardly favorable for the maximum 

 reproduction in the tubes, but ten females whose record was 

 kept produced an average of 31 young each in 17.4 days, or an 

 average of 1.7 each per day. All of these females were 

 winged but two, whose rate averaged 2.2 young per day. The 

 time required for the development of the individual was ob- 

 served in fifteen cases and was found to average 12 days, 

 ranging from 8 to 17 days. 



Young born January 20, matured and reproduced February 

 3, which reproduced February 1 1, which young reproduced 

 March 2, which became mature March 17 and bore young of 

 record March 31, which became mature and reproduced young 

 April 15, which became adult April 26. Thus, there were six 

 generations in 96 days, the young of one generation not having 

 been isolated until 15 days after reproduction commenced, so 

 that the minimum time for the six generations would have been 

 about 80 days. 



Of the young born March 31, part developed into the 

 winged males and apterous oviparous females, while others 

 became viviparous females, which gave birth to young which 

 became sexual. The young stages of the sexual individuals 

 were noticeably pinkish in contrast to the usual yellowish- 

 green. The sexes differ from the viviparous form in the' usual 

 manner. 

 Apterous oviparous female. 



One specimen, 1.9 mm. long by 1 mm. wide; antennae 2 mm., seg- 

 ments, 3, 0.50 mm.; 4, 0.35 mm.; 5, 0.30 mm.; 6, 0.10 mm.; 7, 0.50 mm.; 



