PROCEEDINGS, 1916. 25 



SUB-FAMILY TRYXALINAE. 



The members of this sub-family are not very njurious in this province. They do 

 mot have a spine or tubercle between the first pair of legs. The face is very oblique. 

 The front wings are well developed, though in the female of one species these are much 

 shorter than the abdomen. 



Key to Genera of Tryxalinae. 



A. Foveolae of vertex visible from above, face very oblique. 



B. Tegmina well developed, with well developed elevated intercalary vein. 

 Median carina rather high and sharp, cut plainly in front by principle sul- 

 cus Mecostethus. 



BB. Tegmina without strongly developed, elevated intercalary vein. Median 



carina low, lateral carina distinct and coming closer together at middle 



Chorthippus 



Chorthippus Fieb. 



This genera is represented by insects of small size and various colorations. So far 

 but one species has been taken, viz.: C. curtipennis, Harris. The color and markings 

 vary in this species, but are usually a dark brown tinged with green. The male is very 

 small with well developed tegmina. The female is much larger than the male and is 

 very slender with tegmina about half as long as the abdomen. 



This locust is very common throughout the province. It is generally found wher- 

 ever there is a succulent growth of grass, but it is not very injurious. 



Mecostethus (Fieb.) 



The species of this genus are not very common in the province, and are only found 

 in damp marshy places. They are very trim looking insects. The males are very strong 

 fliers, the females more sluggish and more difficult to find, as they hide among the long 

 trass or sedges. 



KEY TO SPECIES. 



A. Scapular area of tegmina with pale yellow streak. Intercalary vein of male 

 with low obscure teeth lineatus. 



AA. Scapular area of tegmina without yellow streak. Intercalary vein of male 

 with many sharp, closely set teeth gracilis. 



M. gracilis Scudder . 



General color light brown to yellowish. Tegmina light colored without any mark- 

 ings. Hind femora with outer face yellowish, inner face coral red. Hind tibia with 

 three dark bands. Males strong silent fliers. 



M. lineatus (Scudder). 



General color light to dark brown, much darker than gracilis, and larger. A very 

 narrow yellow line extends from behind the eyes along the lateral carina of pronotum. 

 Tegmina with distinct yellow streak along scapular area. Hind tibia with yellow band 

 towards base. 



