ART. 1 LARVAE OF AMERICAN TENEBRIONINAE ST. GEORGE, H 



2. Mandibles apically trifid (o\ o', o') with (figs. 32) or witliout (figs. 2 and 



5) an additional dorsal tooth (t) between apex and molar part (m) — 3. 



Mandibles apically bifid (a\ and a") with an additional dorsal tooth (t) 



between apex and molar part (figs. 51, 53, 60, and 62) 12. 



3. Left mandible with additional tooth between apex and molar part; right 



mandible without tooth 4. 



Both left and right mandibles without additional tooth between apex and 

 molar part 10. 



4. Ninth abdominal segment short and upwardly directed; dorsal shield of 



ninth articulating by lateral condyles with dorsal shield of eighth ring; 



cerci with basal projections (figs. 36, 37, 38, 39) 5. 



Ninth abdominal segment not short and upwardly directed, dorsal shield 

 continuous with that of eighth segment; cerci without basal projections 

 (figs. 14, 40, 45, 49) 6. 



5. Eighth tergum posteriorly produced into a transverse series of conelike 



projections or teeth (fig. 36) An undetermined specimen. 



Eighth tergum entire, not produced into a transverse series of conelike 

 projections (fig. 37) Haplandrus LeConte. 



6. Pygidium with small seta -bearing spines anterior to cerci (figs. 9, 40, 41, 



55) , 7 



Pygidium without small seta-bearing spines anterior to cerci (fig. 45) 



Polypleurus Eschscholtz. 



7. Epipharynx with many short, spinelike setae on the soft skinned part 



(fig. 1) (eastern and southern species) Xylopinus LeConte.' 



Epipharynx with only two short, spinelike setae on the soft skinned part 

 (eph, fig. 31) 8. 



8. Pygidium with transverse row of strong, hook-shaped, seta-bearing spines 



anterior to cerci Glyptotus LeConte. 



Pygidium with small, but not hook-shaped, seta-bearing spines anterior to 

 cerci (fig. 44) 9. 



9. Trochanter and femur of all legs similarly armed with small seta-bearing 



spines (figs. 42 and 43) (northern and western species) 



Iphthlmus Truqui. 

 Trochanter and femur of all legs not similarly armed; anterior pair with 

 large, coarse, blunt, seta-bearing spines, second and third pairs armed 

 with setae and a few small spines (figs. 34 and 35) 



Alobates Motschulsky. 



10. Pygidium with small seta-bearing spines anterior to cei'ci, dorsally with 



one pair stronger and bifid (figs. 9 and 14) ; prothoracic legs strong, 

 considerably larger than rest ; hypopharyngeal sclerite anteriorly tri- 

 cuspidate, without median vertical projection {hsc, fig. 8) ; anal segment 

 without projecting and retractile ambulatory warts (verrucae) (figs. 12 



and 14) ; body soft membranous 11. 



Pygidium without seta-bearing spines anterior to cerci (fig. 45) ; prothoracic 

 legs nearly the same size as rest (figs. 47 and 48) ; hypopharyngeal sclerite 

 anteriorly tricuspidate with median, verticle projection bifid or grooved at 

 apex (fig. 46) ; anal segment with two projecting and retractile ambu- 

 latory warts (verrucae) (mv, fig. 45) ; body corneous— Scotobates Horn. 



11. Epipharynx with many short, spinelike setae on soft-skinned part, no two 



of which are distinctly larger or more prominent than rest (eph, fig. 1) ; 

 back of mandible with two setae, one anteriorly at base of teeth, other 

 near fossa for dorsal articulation of mandible (figs. 2 and 15) ; trochanter 



