THE CANADIAN ENTOMOLOGIST. 191 



Genus Diplotaxis Kirby. — Labrum transverse, lanceolate, anteriorly 

 emarginate. Mandibles very short, trigonal, incurved, truncated and con- 

 cavo-convex at the apex ; molary space small, irregular, channelled ? 

 Maxillae very short, incurved, incrassated at the base ; apex . armed with 

 three short, stout, conical teeth. Labium very short, transverse, entire, 

 separated by a faint line from the mentum. Mentum quadrangular, rather 

 wider than long. Palpi maxillary four-jointed, very minute, cylindrical ; 

 second and third joints thicker, equal in length, obconical ; last thickest 

 and longest, lanceolate-ovate, acute. Palpi labial three-jointed ; first joint 

 obconical ; second subcylindrical ; third nearly as long as the other two, 

 but scarcely thicker, conical. Antennae ten-jointed ; scape elongato- 

 obconical ; pedicel nearly spherical ; third and fourth joints conical ; fifth 

 and sixth nearly top-shaped ; seventh pateriform ; the three last forming a 

 short ovate knob. 



[130.] Body between oblong and ovate, not hairy. Head inserted, 

 subtriangular with the vertex of the triangle truncated ; rhinarium trans- 

 verse, vertical, widely emarginate ; nose transverse, distinct, anterior mar- 

 gin reflexed and subemarginate ; no distinct postnasus or afternose ; can- 

 thus septiform, cleaving : prothorax transverse with an anterior sinus of its 

 whole width to receive the head : scutellum short, triangular, somewhat 

 rounded at the vertex : podex and part of the penultimate dorsal segment 

 of the abdomen uncovered: legs thus located ;; ; cubit tridentate ; tarsi 

 filiform, slender ; claws bipartite, the interior lobe the shortest and widest, 

 and very obtuse ; the exterior very slender and acute. 



179. Diplotaxis tristis Kirby. — Plate v., fig. 3. — Length of body 

 5 — 5/^ lines. Several specimens taken in Lat 54°. Taken also in Nova 

 Scotia by Capt. Hall. 



[131.] Body dark chestnut, more or less grossly punctured above and 

 below. Head thickly punctured with a pair of impressions between the 

 eyes ; nose subemarginate ; antennae and palpi rufous : prothorax thickly 

 punctured, slightly impressed at the four angles : scutellum impunctured : 

 elytra rather paler than the head and prothorax, with nine rows of punc- 

 tures, viz., a single one at the suture, four arranged in pairs at the disk, 

 and four in the sides ; the interstices between the rows are also irregularly 

 punctured ; the four posterior tarsi, especially the intermediate pair, are 

 longer than the tibiae. 



Obs. In more recently disclosed specimens the body is often entirely 

 pale - chestnut and sometimes rufous. [Common throughout Ontario. 

 " Middle States and Lake Superior, not rare." Le Coutc] 



