THE CANADIAN ENTOMOLOGIST 115 



The writer's specinicMis were taken at Jordan, Ontario, on August 8r(l, 

 1916. Dr. E. M. Walker kindly loaned for examination specimens of males 

 and larva? of triseriatus taken by him at De Grassi Point, Ontario. The larvae 

 were obtained from a tree-hole on July 4th, 1917, and the males bear the date 

 June 23, 1917. These were reared from larva^ taken from the same tree-hole. 



Aedes triseriatus is a small black and white mosquito in which the markings 

 are very characteristic. The mesonotum has a broad band of dark brown 

 scales running from base to apex and covering the central half. The sides are 

 pure-white scaled. The abdomen is black-scaled dorsally, except for white 

 spots laterally at the base of each segment. The venter is white-scaled, except 

 for apical black bands on the posterior segments. The legs are black and the 

 wings are clothed with black scales. 



Aedes aldrichi Dyar and Knab. 



While investigating the mosquito problem of the Fraser \'alley, B.C. 

 during 1919, the writer found Aedes aldrichi to be the dominant mosquito of that 

 district. Previous to this it had been known only from Montana and Idaho. 



The extensive development of this species in the Fraser \'alley is apparently 

 dependant iipon the fluctuation of the river. In years of high freshet, the 

 cotton-wood bottom lands around the river become flooded and aldrichi is 

 extremely abundant. The adults bite very viciously and are so small that 

 they can penetrate ordinary screening with comparative ease. 



Swarming of males was observed at six p.m. on July 12th, 1919, at Dewdney, 

 B.C. Four or five dozen individuals were hovering in a swarm three or four feet 

 from the ground. The swarm was composed almost entirely of males and was 

 in a place well protected by willow growth. 



This small grayish Aedes has the thorax clothed with yellowish-gray to 

 pale straw-coloured scales. There is a broad median divided stripe of dark 

 brown scales, and two short lateral markings of the same colour. The abdomen 

 is black, with crisp white basal bands narrowed in the centre and broadening 

 laterally in the posterior segments to form broad triangular patches. The legs 

 are black, and the wings are entirely black-scaled. 



Specimens were taken at Mission, B.C., between June 13th and August 

 3rd. They were found throughout the valley from Hope to Ruskin. 



Anopheles quadrimaculatus Say. 



It is surprising that there are no previous Canadian records of this mosquito, 

 as the writer found it to be fairly common in some parts of Southern Ontario. 

 Specimens were taken at St. Catharines, Ontario, on August 24, 1916, and at 

 Jordan, Ontario, on August 4, 1916. At the latter place quadrimaculatus was 

 very abundant. It was not found at Guelph, where occidentalis is the common 

 Anopheline. 



A . quadrimaculatus is a gray-brown species in which the brown mesonotum 

 is clothed with yellowish hair scales: the abdomen is grayish-brown and has 

 many silky, pale hairs. The legs, proboscis and palpi are uniformly dark- 

 scaled, save for yellow scales at the knees and the apices of the tibiae. The 

 wrings are marked with four dark spots, these being at the forks of the second 

 and fourth veins, at the base of the second vein and at the cross-veins. The 

 wing fringe is uniformly dark-scaled. 



