76 U.S. NATIONAL MUSEUM BULLETIN 279 



Figures 40-49 



40. Trox scaber (Linnaeus). Dorsal aspect of right and 



left mandibles. 



41. Trox scaber (Linnaeus). Dorsal aspect of left 



maxilla. 



42. Trox unistriatus (Beauvois). Dorsal aspect of left 



maxilla. 



43. Trox sonorae LeConte. Dorsal aspect of right and 



left mandibles. 



44. Trox frontera Vaurie. Distal portion of terminal 



antennal segment. 



45. Trox sonorae LeConte. Distal portion of terminal 



antennal segment. 



46. Trox scaber (Linnaeus). Distal portion of terminal 



antennal segment. 



47. Trox spinulosus dentibius Robinson. Distal portion 



of terminal antennal segment. 



48. Omorgus scutellaris (Say). Dorsal aspect of right and 



left mandibles. 



49. Omorgus texanus LeConte. Dorsal aspect of left 



maxilla. 



