THE CANADIAN ENTOMOLOGIST. 337 



Specimens are of a dirty white colour, with brown markings. Head 

 for the most part brown, slightly paler towards posterior margin. 

 Pronotum brown laterally; anterior margin of mesonotum brown, 

 and a brown area at posterior margin between the wing pads. 

 Anterior halves of abdominal segments 2 and 3 brown, and slight 

 marks on the 4:th segment; brown areas on 6 and 7 about the 

 median line, and on segment 9 there are two small brown dots at 

 anterior margin, and a rather semicircular brown band posteriorly. 

 Some specimens are almost entirely brown, and between these two 

 extremes the amount of brown and white varies. Many specimens, 

 especially females, show slight indications of tubercles on the head, 

 but they are never large, as in the preceding species. A double row 

 of spines on abdominal segments 1-7; postero-lateral margins of 

 segments 3-9 produced into broad, flat spines. Gills on segments 

 4-7 covered by a large jointed elytra. Setae light brown basally, 

 becoming paler distally; well fringed with hairs; joints brown. Legs 

 rather small; femora stout; colour for the most part brown, divided 

 into two areas, the proximal one large and contains a rectangular 

 white spot, the distal one smaller and contains a perfectly round 

 white dot. Tibise brown at proximal end and a brown band near 

 distal end. Tarsi with a brown band toward proximal end. Claws 

 dark and pectinated. 



The nymphs were everywhere abundant, in exposed as well 

 as sheltered places. Images were captured and reared from July 

 1st to July 12th. 



Genus Drunella Needham. 



Several nymphs of this genus were taken, but no imagos were 

 reared. 



CcEnis diminiita Walker. 



This little nocturnal species came to the lamp in the reading- 

 room for the first time on July 2nd, and was taken as late as August 

 12th. The nymphs were common in ponds and lagoons from June 

 5th to July 30th. 



Tricorythus alledus Needham. 



Imagos were captured on July 3rd and 9th, but none were 

 reared. Nymphs which apparently belong to this species were 



