THE SKIN BEETLES. 



593 



V. Trogoderma Lat. 1829. (Gr., "to gnaw + skin.") 



Small, oblong-oval species, having the antennal club 4- to 7- 

 jointed and the antennal grooves occupying the entire space be- 

 tween the prosternum and the lateral margin of thorax; elytra with 

 narrow, oblique crossbars formed by variegated pubescence. Three 

 species are known from Indiana. 



KEY TO INDIANA SPECIES OF TROGODERMA. 



a. Eyes entire, the inner frontal margin not emarginate; antennae of male 

 serrate, the third and fourth joints equal. (Fig. 225.) 

 h. Thorax strongly and rather closely punctate, especially toward the 

 sides; pubescence persistent. 1131. ornatum. 



bl>. Thorax very minutely and sparsely punctate throughout; pubescence 

 easily denuded. tarsale. 

 aa. Eyes feebly notched or emarginate at about the middle of their inner 

 frontal edge; male antennae compact, not serrate. (Fig. 226.) 

 c. Elytra black with reddish bands. 1132. inclusum. 



cc. Elytra brown or piceous with dull faint yellow bands. 



1133. obsolescens. 



1131 (3442). Trogoderma ornatum Say, Journ. Phil. Acad. Nat. Sci., V, 



1825, 1S6 ; ibid. II, 290. 



Oblong-oval. Black, rather shining, tho- 

 rax variegated with reddish and gray 

 hairs ; elytra with three irregular conflu- 

 ent reddish bands bearing gray pubes- 



Mg.225. Head and antenna, of Trogoderma CenCe 5 beneath piceoUS brown. Apex Of 



ornatum. (After jayne.) elytra obtuse and as broad as base. Pro- 



sternum long and rather broad at tip, subcarinate. Club of male antennae 

 formed of joints 6 to 11, which are strongly pectinate. Length 3-4.5 mm. 



Vigo, Marion and Posey counties; scarce. March 23-October 

 19. Found about houses and cellars; the larvre occurring, though 

 rather rarely, as a museum pest in insect collections. 



0. tarsale Melsh., length 1.8-2.5 mm., has been recorded from 

 near Cincinnati. 



1132 ( ). Trogoderma inclusum Lee, Proc. Phil. Acad. Nat. Sci., 1854, 



110. 



Oval, somewhat oblong. Black; thorax 

 with lines of gray hairs ; elytra with four 

 narrow, sinuous, more or less confluent red- 



dish bands bearing gray pubescence, the sub- <^\>^^ ^0C^> 

 apical band enclosing a transverse rhombus 



r „, ' „ , . Fisj. 226. Head and antennae of Trogoderma 



on the suture. 1 horax of the female twice inc i U sum, showing notched eyes. (After 

 as wide as long, finely and sparsely punctate. Ja y ne -) 



Elytra more coarsely punctate ; scarcely narrowed from base to apex. Joints 

 of male antennal club not pectinate. Length 2-3.5 mm, 



