22 CONTRIBUTIONS TO CANADIAN PALAEONTOLOGY. 



brown, while the light brown of the base becomes pallid in a large 

 round spot occupying all the apex of the wing to beyond the trans- 

 versals, heightening the efEect of the dark veins at this point. The 

 transversals foi-ming the base of the apical cells run in a perfectly 

 straight course between the lower forks of the radial and ulnar veins, 

 but above this become zigzag ; beyond the transversals most of the 

 veins are forked. No punctuation can be detected. 



Length of fragment, 9.5°™.; probable length of the tegmina, ll""".; 

 breadth, 2. Y"". The drawing represents the wing too broad. 



North Fork of Similkameen River. — One specimen, No. 92, Dr. G. 

 M. Dawson; 1888. 



HETEROPTERA. 



Family HYDROBATID^. 



A single species of this family has been found in British Columbia 

 which I formerly placed, with reserve, in Hygrotrechus, but have 

 since studied more carefully and concluded that it should form the ^ 

 type of an extinct genus, to which also I referred a species from the 

 tertiaries of Wyoming. 



Tblmatkbchus Scudder. 

 Telmatrechus Scudd., Tert. Ins. N. A., 351 (1890). 



This genus is closely allied to Hygrotrechus Stal, and combining 

 as it does many of the features of this genus and Limnotrechus Stal, 

 may well have been the lineal predecessor of both. The antennae 

 have the first joint only a little longer than the second. The eyes 

 are not at all prominent. The thorax is relatively shorter than in 

 Hygrotrechus. The legs are very long, the tibiae of each pair of legs 

 about as long as the femora of the same legs, an equality which I 

 have not found in any other genera of Hydrobatidffi ; in the fore legs 

 the equality is perfect ; in the middle legs the tibiae ai-e slightly 

 longer, in the hind legs slightly shorter, than the femora ; the hind 

 femora are slightly longer than the middle pair ; so far as can be told 

 from the imperfect remains the tarsi of the middle and hind legs are 

 much shorter than, not a half or probably a third the length of, their 

 respective tibiae. The posterior lateral edges of the sixth abdominal 

 segment are produced to a tooth precisely as in Limnotrechus. 



