Baring 461 



Centrinogyna Csy. 

 The body in this genus in general outHne is not at all unlike that 

 of some forms allied to Limnobaris, and especially the genus Dirabius, 

 but the mandibles are not decussate to any decided degree and are 

 strongly toothed within, though the external teeth of the preceding 

 genus are wanting. The prosternum is simple, separating the coxa? 

 by less than their own width and the tarsal claws are free and slender. 

 The most remarkable peculiarity of the genus, however, resides in 

 the pygidium, which is vertical, well developed and baridiform in 

 the male, but oblique and completely concealed beneath the elytra 

 in the female, as in both sexes of Centrinaspis and other genera 

 allied thereto. The following are four species of the genus hitherto 

 undescribed : 



Centrinogyna canadensis n. sp. — Oblong-elongate, moderately con- 

 vex, only feebly shining, piceous in color, the legs slighdy more rufous; 

 squamules above very small, slender and obscure, not distinct on the 

 pronotum, forming a single loose line on each strial interval, very minute 

 and indistinct beneath; beak in the female cylindric, nearly smooth, 

 evenly and moderately arcuate and not longer than the prothorax, the 

 antennae at three-fifths; prothorax very slighdy wider than long, the 

 sides parallel, evenly and distinctly arcuate, widest at about the middle, 

 rapidly constricted at the tubulate apex, which is fully two-thirds as 

 wide as the base; surface with rather coarse and dense longitudinal rugae, 

 the median line narrowly smooth, also with a small narrow irregular sub- 

 median discal spot at lateral fifth; scutellum very small, nude; elytra 

 three-fourths longer than wide, as wide* as the prothorax and about 

 twice as long, the parallel sides nearly straight, gradually arcuately and 

 in part subsinuously converging in apical third to the broadly obtuse 

 apex; humeral prominences wholly wanting; grooves rather coarse and 

 deep; intervals almost twice as wide as the grooves, each with a single 

 series of small and moderately separated punctures, somewhat confused 

 on the second and third; under surface coarsely punctate, less so and 

 more sparsely on the abdomen. Length (9) 4-6 mm.; width 1.6 mm. 

 Canada (Winnipeg. Manitoba), — Hanham. 



Allied to strigata Lee, but differs in its less distinct vestiture, in 



the rather less coarse pronotal rugae, with sublateral smooth discal 



spot at each side and narrower median smooth line, and in the much 



finer punctures of the strial intervals; the beak, also, is a little 



shorter and thicker. 



Centrinogyna laramiensis n. sp. — Narrow, parallel and rather convex, 

 the elytra feebly shining, brownish-piceous, the tibiae more rufous; 

 squamules above minute, sparse, uniform and barely evident, forming 



