THE CANADIAN ENTOMOLOGIST. 



From vinculata, besides differing in colour and markings, huronian'a 

 has a more deeply sulcate frontal costa, never being plane above the 

 ocellus, and the area of the cubital forks of the wings is narrower, con- 

 taining even in the $ but a single row of cubical cells in at least the basal 

 portion. 



This species is particularly interesting, as it seems to replace T. 

 maritime* on the northern part of the east shore of Lake Huron. In the 

 vicinity of Southampton there is a limited extent of wide, sandy beach, 

 north of which the shore is continuously rocky. On this beach huroniana 

 is to be found under very similar but more boreal conditions to those 

 under which maritima is found further south. 



In flight it is extremely alert, and its stridulation is peculiar, being a 

 very rapid but not loud crepitation, interrupted about thrice in a second, 

 so that at a little distance it seems to be composed of separate notes. 

 Usually three, sometimes four of these, are produced at a time. 

 9. Trimerotropis sordida, new species. (PI. I., figs. 14-18.) 



Of medium or rather small size, uniform dull pale grayish-brown, 

 showing very little contrast in the markings of the body and tegmina. 

 Head light brownish, more or less faintly mottled and punctate with a darker 

 and more grayish colour. Occiput barely or not at all elevated above the 

 pronotum, somewhat roughened, slightly darker than the face. Scutellum 

 fully as broad as long, strongly sulcate; the median carina usually distinct 

 for some distance backwards on the occiput, and limited in front by a 

 slight V-shaped ridge, in front of which is a more or less marked depres- 

 sion. Lateral carinas prominent and sharp, diverging to a point opposite 

 the front margin of the eyes, where they form a marked angle, thence 

 converging in a distinctly incurved course to meet the frontal costa. 

 Lateral foveolas large, subtriangular, moderately depressed. Frontal costa 

 very strongly sulcate throughout, constricted above and below the ocellus; 

 the sides below the lower constriction gently diverging until they meet the 

 clypeus. Lateral carinas of the face reaching the clypeus, strongly bent, very 

 prominent and equally so throughout. Eyes moderately prominent, but 

 not large, being even in the £ distinctly shorter than the genal groove. 

 Antennae about four-fifths ( g ) or three-quarters (?) as long as the hind 

 femora, grayish-brown, darker apically. Pronotum of ordinary length, 

 moderately expanded on the metazone. Process of metazone rectangulate 

 or slightly acutangulate, sides straight, angle scarcely rounded. Greatest 



