296 ENTOMOLOGICAL NEWS. [July, 'lO 



Mansonia pertarbans Walk. 



On the south side of the city this species was rarely observed 

 (at light, June 5 and 9, 1906, June 19, 1908), but in the tracts 

 of woodland in the following localities it was both common 

 and annoying: Palos Park (at light, June 20, July 20, 1908) ; 

 Beverly Hills (at light, June 27, 1908) ; Glen Ellyn (August 

 2, 1908), and Hessville, Ind. (at light, July 4 and August 29, 

 1908). 



Aedes bimaculatus Coq. 



Only one specimen, a female, of this easily recognized, 

 Southern species can be recorded. It was collected by Mr. 

 Alex. Kwiat, at light, at Hessville, Ind., on July 4, 1908. 



Aedes canadensis Theob. 



Although this mosquito no doubt breeds in most of the 

 tracts of woodland near Chicago, adults were collected only 

 at Glen Ellyn, on May 30, 1908. 



Aedes cnrriei Coq. 



This mosquito was not often observed within the limits of 

 the city (at light, August 26, 1906, June 16, 1907; at light, 

 June i, 1909), but in the open fields near Riverdale, just 

 south of Chicago, on two occasions (September 4, 1907; May 

 17, 1908), it was both abundant and aggressive. 



Even in a series of adults of this species taken at the same 

 place and on the same day there is found a considerable varia- 

 tion in the color of the thorax. On some specimens the me- 

 dian and the lateral brown stripes are barely discernible ; on 

 others they are broad and prominent. The color of the upper 

 surface of the abdomen is likewise variable. On one or two 

 specimens the abdomen is covered entirely with silvery white 

 scales, with barely a trace of black on each side of the four 

 basal segments, while on others the black scales are present 

 on the side of all the segments excepting the last one. 



Aedes fitchii F. and Y. 



The larvae of this species were collected in a ditch at the 

 side of the railroad at Palos, 111., on May 10, 1908. Some 



