March, 1919.] XoTMAX : CoLEOPTERA FROM ONTARIO. 101 



narrowly separated, genae moderately convex ; head rather finely, closely and 

 somewhat indistinctly punctured above and beneath. Xeck very slender. Pro- 

 thorax as wide as the head, one fourth longer than wide, oval, all the angles 

 obliterated, convex, finely and densely punctate and pubescent throughout ; 

 prosternum rather long in front of the coxae, simple, very shining and impunc- 

 tate. Elytra one fifth wider than the prothorax and one fourth longer, con- 

 jointly very slightly emarginate, finely, closely, subrugosely punctate and finely 

 pubescent throughout. Abdomen nearly as wide as the elytra at base, slightly 

 wider to the fifth segment, thence more strongly narrowed to the apex ; first 

 three dorsal segments transversely impressed at base, very finely and densely 

 punctate and pubescent throughout. Legs slender, tibiae slightly thicker at 

 apex with outer angles obliquely truncate; tarsi two thirds the length of the 

 tibiae, first joint longer, two-four subequal about as long as wide, last joint 

 equal in length to the two preceding. Length 3-3.4 mm., width .4-.S mm. 

 male, two females). 

 Male. — Fourth ventral segment faintly impressed at middle ; fifth seg- 

 ment with two strong teeth at the posterior margin separated by one third the 

 width of the segment and projecting posteriorly, equal in length to slightly 

 less than one half the width of the segment: the teeth are arcuate, concave 

 within, the inner edge continuous with the edges of a triangular impression 

 on the middle of the segment, the impression is acute at the posterior margin 

 and deepest at the anterior margin between the bases of the teeth, where the 

 segment is emarginate ; the depth of the emargination is equal to one third 

 width of the segment and projecting posteriorly, equal in 

 length to slightly less than one half the width of the seg- 

 ment; the teeth are arcuate, concave within, the inner 

 edge continuous with the edges of a triagular impression 

 on the middle of the segment, the impression is acute at 

 the posteriar margin and deepest at the anterior margin 

 between the bases of the teeth, where the segment is 

 emarginate ; the depth of the emargination is equal to 

 one third the width of the segment ; its basal margin is 

 straight and transverse and bears a short, pointed tooth 

 on the median line which projects upward and backward 

 and is slightly bent downward at the extreme tip. The 

 sixth segment is triangularly emarginate ; the emargina- 

 tion is as broad as long and equal in depth to one half Ventral abdominal 

 , ., , r 1 • j 1 segments of 5>co- 



the width of the segment; its apex and outer angles are p<gus linearis> male . 



rounded; the seventh segment is elongate, acutely tri- 

 angularly cleft to the base. 



Female. — Sixth segment broadly rounded at apex. 



This species seems closely allied to 5". brunnipes Lee, but differs 

 in the form of the abdominal modifications of the male as described 

 bv Casey. 



