664 



FAMILY XXVIII. TROGOSITID^. 



aa. Thorax nearly twice as broad as long, sides much rounded, hind angles 



small, obtuse. 

 <1. Elytra unicolorous without spots. 



c. Size larger, 10-11 mm. ; intervals of elytra subconvex, minutely 

 rngulose. 1274. AMERICANA. 



cc. Size smaller, not over 8.5 nun. ; intervals of elytra nearly flat. 



/. Dark reddish-brown to piceous. 1275. LATICOLLIS. 



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



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

 dle. 1277. BIMACULATA. 



T. maui'ilanica Linn., blackish-piceous and easily known by 

 having the joints of antenna? gradually increasing in width, is a 

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

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



1271 (3838). TENEBROIDES CORTICALIS Melsh.. Proc. Phil. Acad. Nat. Sci., 



II, 1844. 100. 



Elongate-oblong, subcon- 

 vex. Black or piceous, feebly 

 shining: anteun;e 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 subtruncate. Ely- 

 tra shallowly striate, the stria- 



Fig. 247. a, larva; e, its mandible; d, antenna: e, under side of with 1WVS f ther COJirse 

 head; /. the 2-horned anal plate; b, the beetle; h, its antenna; i, <]>(>]), oblong pUUCtlireS ; inter- 

 mandible; g, labiuin and its palpi; j, one of the maxills and its 



palpus. (After Riley.) vals nearly flat, slightly rugu- 



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-October 10. 



1272 (3S38b). TENEBROIDES DUBIA Melsh., Proc. Phil. Acad. Nat. Sci., II, 



1844, 110. 



Resembles corticaUs 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; frequent, February 14-November 8. 

 Occurs beneath bark and logs, where it hibernates. 



1273 (3839). TENEBROIDES NANA Melsh., Proc. Phil. Acad. Nat. Sci., II, 



1844, 10. 



Elongate-oblong, subdepressed. Dark reddish or chestnut brown. Tho- 

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

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



