LARVAL TAXONOMY OF THE TROGINAE IN NORTH AMERICA 



Table 1 . — List of species of Trox in Korik America after Vaurie ( 1955) and Howden 

 and Vaurie ( 1957) . The species of the suberosus group have been placed in the genus 

 Omorgus as a result of this and other recent investigations. Species whose larvae 

 are now known are marked by an asterisk, and the third stage larva of each is 

 described in this study. 



1 . scaber group 



*T. scaber (Linnaeus) 



*T. aequalis Say 

 T. affinis Robinson 



*T. fascifer LeConte 

 T. striatus Melsheimer 

 T. laticollis LeConte 



*T. atrox LeConte 



2. terrestris group 



T. hamatus Robinson 

 T. spinulosus simi Robinson 

 T. s. spinulosus Robinson 

 *T. s. dentibius Robinson 



* T. foveicollis Harold 

 T. terrestris Say 



* T. frontera Vaurie 



3. tuberculatus group 



*T. sonorae LeConte 

 T. contractus Robinson 



*T. robinsoni Waurie 

 T. gemmulatus Horn 

 T. acanthinus Harold 



*T. tuberculatum (DeGeer) 

 T. floridanus Howden and 

 Vaurie 



*T. plicatus Robinson 



no attempt at this time to separate the species on a worldwide basis. 

 It may well be that there are more than two genera worldwide. 



The characters of the immature stages of the genus Trox lend support 

 to Vaurie's recognition of the scaber and terrestris groups for the adults. 

 Larvae of the scaber group have an epipharynx with four smaller 

 sensory spots distad of the two lai'ger, setiferous sensory spots on the 

 sensory area of the haptomerum and only two sensory spots distad of 

 the slightly arching, transverse row of sensory spots on the pedium. 

 The terrestris, tuberculatus, and unistriatus groups have only two smaller 

 sensory spots distad of the two larger, setiferous sensory spots on the 

 sensory area of the haptomerum and four sensory spots distad of the 

 slightly arching, transverse row of sensory spots on the pedium. The 



4. unistriatus group 



*T. variolatus Melsheimer 

 *T. sordidus LeConte 

 T. capillaris Say 



* T. unistriatus Beauvois 



5. suberosus group 



T. tytus Robinson 

 T. howelli Howden and Vaurie 

 *T. suberosus Fabricius 



* T. rubricans Robinson 



* T. carinatus Loomis 



T. tomentosus Robinson 



* T. monachus Herbst 

 *T. fuligiriosus Robinson 



T. scabrosus Beauvois 

 *T. asper (LeConte) 



* T. punctatus Germar 

 '^T. infiatus Loomis 



T. tesselatus (LeConte) 



T. nodosus Robinson 



*T. texanus (LeConte) 



T. umbonatus (LeConte) 



*7'. scutellaris Say 



