LARVAL TAXONOMY OF THE TROGINAE IN NORTH AMERICA 41 



tional smaller tooth (S4 of right mandible and S5 of left mandible) on 

 ventral aspect of each mandible at base of S3 and S4. Smaller teeth 

 each with small brustia near base. Molar area of left mandible hollowed 

 for reception of molar area of right mandible. Each mandible with 

 brustia on median border near base. 



Prothorax (fig. 29) with prominent yellow brown to black, sclerotized 

 shield on each side; shield bordered with setae. Setae more numerous 

 on anterior border. Setae continuous across dorsal nonsclerotized area 

 between shields. Large lateral lobe with about 25 to 100 setae. Cribri- 

 form spiracle located caudodorsad of lateral lobe ; concavity of respira- 

 tory plate directed anteroventrally. Sterum with to about 20 setae 

 on each of 2 weak, transverse lobes. 



Mesothorax (fig. 29) divided dorsally into larger anterior lobe and 

 smaller posterior lobe. Anterior lobe with transverse band of numerous 

 setae; posterior lobe with transverse row of about 8 to 18 setae. Large 

 lateral lobe v/ith about 20 to 85 setae. Sternum with 2 groups of setae, 

 with about 6 to 50 setae in each group. 



Metathorax (fig. 29) also divided dorsally into larger anterior lobe 

 and smaller posterior lobe. Anterior lobe with transverse band of 

 numerous setae; posterior lobe with transverse row of about 8 to 18 

 spinules and about 4 to 12 setae. With 2 lateral lobes; smaller anterior 

 lobe with about 5 to 25 setae and larger posterior lobe with about 

 17 to 60 setae. Sternum with 2 groups of setae; anterior transverse 

 band with about 7 to 60 setae; posterior patch with about 7 to 50 setae. 



Infraepisternal area usually with 1 to 10 setae on prothorax; with 

 or without as many as 8 setae on mesothorax and metathorax. Infra- 

 epimeral area of prothorax with about 2 to 20 setae ; with about 8 to 

 40 setae on both mesothorax and metathorax. 



Legs (fig. 27) four-segmented and subequal, increasing slightly in 

 length posteriorly. Short setae numerous on all four segments; long 

 setae only on 2 basal segments. Each leg with long terminal claw with 



2 setae. Tibiotarsus with terminal whorl of 6 setae plus about 15 to 22 

 setae proximad of whorl. 



Abdomen (dorsal aspect, fig. 33) with segments 1 through 8 with 



3 dorsal lobes (DLl, DL2, and DL3) and lateral cribriform spiracles. 

 Spiracles subequal, with concavity of respiratory plate directed antero- 

 ventrally. Segments 1 through 6 with similar setal pattern. DLl with 

 transverse row of spinules usually flanked anteriorly and posteriorly 

 by short, fine setae (absent in at least 2 species). DL2 with transverse 

 row of spinules plus setae. Long and short setae occur posterior to 

 spinules but only short setae occur anterior to spinules, setae becoming 

 more numerous laterally and often intergrading with setae of spiracular 

 lobe. DL3 with row of spinules plus setae. Long setae occur posterior 

 to spinules on segments 1 to 4 and anterior to spinules on segments 

 5 and 6. When present, short setae occur anterior to spinules on 



