26 U.S. NATIONAL MUSEUM BULLETIN 279 



Abdomen (dorsal aspect) with DLl of segments 1 through 4 with 

 single transverse row of about 14 spinules. DL3 with single row of 

 about 4 to 8 spinules. Segment 7 with transverse row of about 12 to 

 14 intermixed setae and spinules on DLl. DL2 with transverse row of 

 about 18 to 20 long and short setae. DL3 with a few scattered small 

 setae. 



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

 2 setae on LLl ; LL2 usually with 2 to 4 setae; LL3 with about 1 or 

 2 setae. 



Trox scaber (Linnaeus) 



Silpha scabra Linnaeus, 1767, Systema naturae, ed. 12, p. 573. 



Description based on the following material. Twenty-six larvae 

 reared from a single female collected at black light about 10 miles 

 north of Corvallis, Benton Co., Oreg., April 26, 1965, by Charles W. 

 Baker. Twenty-two larvae reared from Fi adults of the above female. 

 Four larvae collected from palm tubs in Bremen, Germany, June- 

 July, 1930, by J. D. Alfken. Loaned by P. O. Ritcher. 

 LI : head capsule width 0.80 to 0.93 mm. ; 1 1 specimens. 

 LII: head capsule width 1.02 to 1.27 mm.; 17 specimens. 

 LIII: head capsule width 1.39 to 1.70 mm.; 24 specimens. 



Description of Third Stage Larva 

 Figures 3, 23, 40, 41, 46, and 58 



Cranium light orange to light orange brown; with numerous prom- 

 inent pits. Median epicranial setae very short or absent. With about 5 

 long setae near each antenna. Exterior and anterior setae of frons very 

 short. Postclypeus usually with 1 long and 1 short seta on each side. 

 Epipharynx with about 4 to 5 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 

 large seta on each side of sensory area, seta on right side usually only 

 slightly removed from anterior border of epipharynx. Anterior region 

 of pedium usually with 2 sensory spots distad of slighdy arching, 

 transverse row of about 10 sensory spots. Hypopharynx with distal 

 area with 2 sensory spots distad of transverse row of about 10 sensory 

 spots. Maxilla with lacinia bearing 3 unci and about 10 to 12 stout 

 setae. 



Prothorax with about 1 or 2 setae on anterior lateral lobe, usually 

 with 1 seta on posterior lateral lobe. Infraepisternal and infraepimeral 

 areas usually with 1 seta each. 



Mesothorax with about 3 setae on lateral lobe. Infraepisternal area 

 usually without setae; infraepimeral area usually with 1 seta. 



