664 



FAMILY XXVI [I. TROGOSITID.^. 



aa. Thorax nearly twice as broad as long, sides mueli roundeil, bind angles 

 small, obtuse. 

 (I. Elytra unicoloroTis without spots. 



e. Size larger. 10 11 mm.; intervals of eljtra subconvex, minutely 

 rugnlose. 1274. Americana. 



ee. Size smaller, not over 8.5 mm. ; intervals of elytra nearly flat. 



/. Dark reddish-brown to piceons. 1275. laticollis. 



ff. Light reddish or brownish-yellow. 1276. obscura. 



dd. Elytra each with an irregular shaped yellowish spot in front of mid- 

 dle. 1277. BIMACULATA. 



T. manritanica Linn., blaekish-piceons and easily known by 

 having- the joints of antenna:^ g-radually increasing in width, is a 

 cosmopolitan species which has been taken near Cincinnati. (Fig. 

 246.) It is connnonly known as the "cadelle." 



1271 (3S38). Tenebroides corticalis Melsli.. Proc. Thil. Acad. Nat. Sci., 



II. 1S44, 100. 



Elongate-oblong, s u b con- 

 f^"^^^ vex. Black or piceous, feebly 

 ^£l5^ shining; antennte and legs pic- 

 eous. Head and thorax coarse- 

 ly punctate, the latter nar- 

 rowed, with sides sinuate be- 

 hind the middle, margins re- 

 flexed, base subtrnncate. Ely- 

 tra shallowly striate, the striaj 



Fig. 247. a, larva; [cits mandible; ,/, antenna: f, under side of "'i*^l^ 1'<WS of rather COarse, 

 head; /. tlie 2-horned anal plate; b, the beetle; /(, its antenna; i, rlppn nlilnn.r nnnr-tiivoc • in+oi- 

 mandible; g. labinm and its palpi; j, one of the maxilla; and its "^^^^' ^^"'""fe punctuies, intei- 



palpus. (Aft«r Riley.) vals nearly flat, slightly rugn- 



lose, each with two irregular rows of very minute, oblong, distant punc- 

 tures. Length 7.5-8 mm. (Fig. 247.) 



Southern half of State: scarce. April 18-(^ct()l)er 10. 



1272 (383Sb). Teaebrooies dubia Melsh., Proc. Phil. Acad. Nat. Sci., II, 



1844, 110. 

 Resembles corticalis but smaller. Thorax more quadrate, sides scarce- 

 ly at all rounded; punctures more sparsely placed and coarser; those of 

 intervals of elytra distinctly larger and in more regular rows. Length 

 5-6.5 mm. 



Throughout the State; fretpient. February 14-November 8. 

 Occurs beneath bark and logs, where it hibernates. 



1273 (38.39). Tenebrouies nana Melsh., Proc. Phil. Acad. Nat. Sci., II, 



1844, 10. 

 Elongale-oitlong, subdcitrcsscd. I);u'k reddisli uv chestnut brown. Tho- 

 lax more depressed, slightly broader than long, sides moderately rounded 

 and feebly converging, but not sinuate behind the middle; punctures, as 



