32 B. C. ENTOMOLOGICAL SOCIETY 



as if the white wings were showing through. There are a number of 

 dark speckles across each segment. The antennae cases are also green 

 — legs white — proboscis ( ?) green. Some of the more backward larvae 

 did not pupate until the end of July — not until several imagines from 

 early pupae had emerged. 



The first moth (a female) emerged on 25th July, the second (a 

 male) on the 29th, and the third (a female) on the 31st. In all, 29 

 moths emerged — 12 males and 17 females. In the wild state, the moth 

 is sometimes found at rest on the trunks of trees, where it is a con- 

 spicuous object; but it is easily disturbed and has a tendency to fly 

 upwards among the branches of the firs. 



NOTES ON THE ECOLOGICAL DISTRIBUTION OF SOME 



ORTHOPTERA FROM THE CHILCOTIN DISTRICT 



OF BRITISH COLUMBIA 



By E. R. Buckell 



In British Columbia there are some species of Orthoptera which 

 do not frequent the same type of habitat in diflferent parts of the Prov- 

 ince, and the following notes on ecological distribution apply only to 

 the Chilcotin District, and mainly to the Riske Creek Range situated 

 in the angle made by the junction of the Fraser and Chilcotin Rivers. 



In dividing a number of species into "groups" or "associations of 

 species" there are a number of plans which might be adopted. In the 

 Chilcotin District, however,- the topographical and floral characters lend 

 themselves readily to the formation of four main divisions, populated 

 by fairly distinct groups of species. These may conveniently be called 

 the campcstrian, sylvan, semi-sylvan and hygrophilous groups. The cam- 

 pcstrian group may, furthermore, be sub-divided into phytophUous, saxi- 

 coloits and gcophilous species ; and the hygrophilous group into humicolous 

 and pahidicolous species. These sub-divisions are added to further 

 emphasize the various types of environment chosen by the campestrian 

 and hygrophilous species for their normal habitat (i.e., the habitat in 

 which they are found in greatest numbers). A short description of the 

 district will further explain the choice of these headings. 



The Riske Creek Range is an undulating, triangular, tableland, with 

 an elevation ranging from 3,000 to 3,500 feet. It is bounded on two 

 sides by the river valleys of the Fraser and Chilcotin Rivers, which are 

 approximately 1,500 feet below the level of the main tableland. 



The steep river valley slopes and the main tableland are open 

 grass lands bounded on the north by forests of fir, spruce and pine. 

 This open grass covered area contains about 300 square miles and forms 

 the home of the campestrian species. 



