ISOPLEURID/E. 49 



adjoining to the suture is a broad black stripe not reaching the apex ; the furrows are rather deep 

 and impunctured; and in the usual situation, a little beyond the middle, a punctiform impression is 

 adjacent to the second furrow : the sides of the fore-breast, the anus, and the legs, are reddish- 

 yellow. 



Variety B. Thorax without a black spot in the disk, body underneath piceous. 



This species, though very like T. flavipes, is quite distinct from it; it is nearly related also to 

 T. flavicollis of Sturm, 5 but it is much larger, the three first joints of the antenna;, and not the 

 scape only, are paler than the others; and the prothorax is transversely punctured at the base, which 

 in that species is impunctured. 



Family ISOPLEURIM:. 6 Isopleuridans. 



XXIII. * Genus ISOPLEURUS. 



Labrum rather square, emarginate at the tip. 



Palpi maxillary, antepenultimate joint longer than the rest, subcylindrical ; penultimate shorter 

 than the last joint, obconical ; last semi-ovate, subtruncate. 7 



labial, penultimate joint longer than the rest, subclavate ; the last semilanceolate, subacute. 8 



Labium deeply emarginate sometimes with a short intermediate denticle, or prominence. 



Tongue shorter than the paraglossae. 



Antenna three first joints glossy, the third very little longer than the subsequent ones. 



Bdoy linear-oblong. Head subtriangular ; frontal impressions punctiform. Prothorax subqua- 

 drate, rather narrowest anteriorly; sides curving: base as wide as the elytra. Scutellum wider than 

 long. Elytra with the sides parallel, very slightly sinuated at the apex. Hand of the males with 

 three dilated joints. 



I know two species belonging to this genus, one taken by Mr. Drummond, in the late Expedi- 

 tion, amongst the Rocky Mountains, and the other, which is in my own cabinet, I judge from the 

 pin with which it is transfixed, to have been taken in the East Indies by Major General Hardwicke, 

 and probably given by him to the late Mr. Marsham, at the sale of whose cabinet, though I have 

 no memorandum of the fact, I suspect I purchased it. If this conjecture turns out correct, this is 

 an instance of another Oriental form from the above mountains, and confirms a remark Mr. Sabine 

 once made to me, that the natural productions, he spoke of the plants, on their western side appeared 

 of an Asiatic type. 



It should be observed however that the Asiatic species differs from the American in having no 

 prominence in the sinus of the labium, its maxillary palpi also are less acute, and the prothorax not 

 so narrow before, or more approaching to a square, so that perhaps it may form a subgenus in the 

 Isopleuridans. This genus seems to have some relationship to Amara. 



* Deutsch. Fn. v, 87, 11, t. eli,/. c. 



6 The Trechidans and Isopleuridans cannot be included in one family because the former has four dilated joints in the 

 hand of the male insect and the latter only three. I placed Stenolophvs next to Harpalus, because the males of both agree 

 in being quadrimanous, or having four dilated tarsi ; yet I am rather inclined to think that Isoplcurus and Trechus, as repre- 

 senting the Dimanous Geadephaga. ought to be placed first. 



7 Plate I, Fig. 6 a. S Ibid. b. 



H 



