48. J- L. LECONTE, M. D. 



S. COStatum. — Ovate convex, brown, opaque; prothorax produccfl ia 

 frt)nt over the head, dilated at tlie sides, narrowed behind, with several im- 

 pressions and obtusely elevated lines, at tlie miildle with a large elongate rhoin- 

 boidal impression ; elytra finely rugose, with suture, margin and three discoidal 

 costae elevated, an oblique diseoidal impression behind the base, and a large 

 tubercle near the side in front of the middle ; interspaces with two rows of small 

 quadrate punctures. Lengtii 2 n)m; .075 i)ich. 



Texas; Mr. G. W. Belfruirc. Though not found od the Pacific 

 Slope of the continent, the characters are so extraordinary tlmt 1 have 

 included this species in the present paper as a proper companion to 

 the other singular forms which are here described. 



TRIOOIVLRUS Muls. 



T. Crotcllii. — Dark chestnut-brown, shining, depressed, head and pro- 

 thorax sparsely punctured, the latter one-half wider than long, narrowed and 

 rounded on the sides in front of the middle, tip emarginate, base truncate, 

 hind angles rectangular, disc feebly channelled with a large shallow coarsely 

 punctured basal triangular impression eacli side; elytra twice as long :is the 

 prothorax, each with six deep strongly punctured striie, the seventh is liiinler, 

 abbreviated in front about one-fifth from the base, and the eighth does not 

 reach the middle ; abdomen sparsely punctured. Length 4.5 n>n». 



Vancouver Island and 8iorra of California ; under pine b;uk. The 

 characters of this genus, so peculiar as almo.st to warrant its estabi sh- 

 nient as a separate tribo, have been fully pointed out by -^Ir. 

 Kraatz (Ins. Deutschl. ii., 8ll5), and the question of its affinities need 

 not be here discussed. In comparison with the figure of the European 

 T. Melh/i, given by Duval (Gen. Col. Eur. ii., pi. 2:}, f 113), this 

 species differs conspicuously by the prothorax being transverse, and 

 more rounded on the sides before the middle, the color is also less 

 blackish and more testaceous, and the abdomen longer and narrower. 



T. caelatns. — Brown, shining, depressed; head deeply punctured, trans- 

 verse frontal impression strongly marked, neck smooth; prothorax coarsely 

 and sparsely punctured, punctures n)ore dense in the triangular shallow basal 

 impressions, and more distant each side oi the dorsal channel, which is deep, 

 but does not extend to the base; behind it is a vague V-shaped impression, 

 sometimes obsolete ; elytra with close set rows of large punctures, which do 

 not form grooves or striae (as in the preceding species) ; abdomen strongly but 

 not coarsely punctured. Length 18 inch; 4.5 mm. 



Sierras of California, under pine bark ; abundant. This species 

 does not differ in size or form from the preceding, but is easily known 

 by the much coarser sculpture. The prothorax is less transverse, 

 being perhaps one-third wider than long, and more broadly rounded on 

 the sides. It differs from T. Me.Ui/i (according to the figure above 

 cited), by the elytra uot wider the prothorax, and by the longer ub- 

 dotuen. 



