28 U.S. NATIONAL MUSEUM BULLETIN 2 79 



Mesothorax with about 3 or 4 setae on lateral lobe. Infraepisternal 

 area usually without long setae; infraepimeral area usually with 1 seta. 



Metathorax with or without 1 seta on anterior lateral lobe and 

 about 2 or 3 setae on posterior lateral lobe. Infraepisternal area usually 

 without long setae; infraepimeral area usually with 1 or 2 setae. 



Abdomen (dorsal aspect) with DLl of segments 1 to 4 with trans- 

 verse row of about 8 to 12 spinules, DL3 with transverse row of about 

 2 to 6 spinules. Segment 7 with transverse row of about 6 to 1 spiniform 

 setae on DLl, DL2 with transverse row of short and long setae. DL3 

 with or without a few very small setae. 



Abdomen (lateral aspect) with segments 1 to 8 usually with 1 seta 

 on LLl; LL2 usually with 2 setae; LL3 usually with 1 seta. 



Trox atrox LeConte 



Trox atrox LeConte, 1854, Proc. Acad. Nat. Sci. Philadelphia, vol. 7, p. 214. 



Description based on the following material. Thirty larvae reared 

 from 6 adults collected at black light about 2.5 miles east of Hermiston, 

 Umatilla Co., Oreg., June 11-13, 1963, by Charles W. Baker. Ten 

 larvae reared from 4 adults collected under chicken remains and a 

 dead crow about 5.0 miles west of Tularosa, Otero Co., N. Mex., 

 July 22, 1964, by David R. Smith and Charles W. Baker. Seven 

 larvae reared from 1 adult collected under chicken remains about 

 4.0 miles north of Las Cruces, Dona Ana Co., N. Mex., July 22, 1964, 

 by David R. Smith and Charles W. Baker. 

 LI : head capsule width 1 .05 to 1.15 mm. ; 9 specimens. 

 LII: head capsule width 1.39 to 1.58 mm.; 6 specimens. 

 LIII: head capsule width 1.98 to 2.39 mm.; 32 specimens. 



Description of Third Stage Larva 

 Figures 23 and 38 



Cranium yellow orange to light yellow brown, with about 10 to 14 

 setae near each antenna. Postclypeus with 3 setae on each side. 

 Epipharynx with about 8 to 10 marginal setae on each side of corypha. 

 Sensory area of haptomerum usually with 4 smaller sensory spots 

 distad of 2 larger setiferous sensory spots. Haptomerum also with 

 1 seta on left side anterolaterad of sensory area. Anterior region of 

 pedium with 2 sensory spots distad of slighdy arching transverse row 

 of about 12 to 14 sensory spots. Tormae with short, stout pternotorinae. 

 Hypopharynx with smaller distal area with 2 sensory spots distad of 

 transverse row of about 1 2 sensory spots. Maxilla with lacinia with 3 

 unci and about 12 to 15 stout marginal setae. 



