AMEUICAN COLEOPTER.V. 93 



Posterior margin emarginate at middle only. 



Posterior margin plain, without spongy border at middle. 



Tliorax entirely testaceous liiitbatns. 



Thorax piceous with narrow testaceous border. 

 Elytra scarcely visibly punctulate; lacinise broad. 



f'liniipoiinis. 



Elytra distinctly punctulate; laciniae slender li'i;;i<liiM. 



Posterior margin of sixth ventral with a narrow sjiong^' border at 

 middle. 

 Elytra as wide or wider than long; color piceous, thorax with 



entire margin paler Crotcliii. 



Elytra lonrer than wide; color castaneous, thorax entirely black 



(except when immature) iii»<itabili!>». 



Sixth ventral not concave nor einarginate. 



Last dor.-ial four-dentate; elytra coarsely and irregularly punctured. 



C'ir<'iiin<-iiictu!«. 

 Last dorsal three-dentate; elytra coarsely and evenly ))unc'tured. 



iiilidiiloides. 



The following; table applies entirely to the females of each species 

 and is intended to be merely supplementary to the previous table, 

 showinjz: Iidw in many eases the femiles ditler considerably while the 

 males are cl sely allied, and at the same time females are here approxi- 

 mated whose males are more widely separated above. 



Last ventral entire or very nearly so, (fig. 1 7, c) ; last dorsal with the three lobes 



connate, (fig. 17, b) luridus, nigricoriiis, circumciiictns. 



Last ventral divided into six processes, usually long and slender. 



Last dorsal deeply bilobed, (fig. 5,d) iliaculicollis. 



Laat dorsal trilobed, lobes usually slender, tiie middle one variable, either 

 entire, eniarginate, bifid or trifid. 

 Middle lobe as long as the lateral, its form, 



slender, with a shorter process on each side, (fig. 24) Crotoliii. 



slender, tip either entire or very feebly notched, (fig. 25 and 11. d). 



iiiNtabilis. 4l(>bilis. 



broader, tip notched one-third toward base, (fig. 21) <*aii:i<l<Mi*tiK, 



agili.s, frigidiiM, uili<liil4>i«leK. 



deeply divided forming two slender processes, (fig. S, h)...|>aa'all(>liis, 



tachyporitidoK, i>i<*i|><'s. f*iinii|ieiiiiiM. repaiKliiK. 



broad. ti)i broadly triangularly notcbtvl, ((ig. 2((, b) Nt'liWiirzi. 



Middle lobe shorter than tlie lateral, its form, 



broadlj' oval, rarely with a very feeble notch at tip, (fig. 22)...liinbatliS. 



broad, triangularlv notched at tip, (fig. 18, c) fiiiibrial giK. 



more slender, feebly notched, (fig. 7, b) iiK'iiiiooiiiiiN. 



deeply divided, foi-ining slender proce.sses, (fig. 0, b) iiii;;iisf atllS, 



sciiiiriil'iiM, iiiiniiis. addendum. 



T. lliaoiilicolliM, MiiUlin. — Piceous, shining, entire thoracic margin and 

 sides of elytra jialer. Head black, antennte piceous, four basal joints paler. 

 Thorax very finely alutaceous. Elytra longer than wide, very finely alutaceous 

 and very minutely and sparsely punctulate. Abdomen more distinctly punctu- 

 late than the elytra. Body beneath very sparsely punctured, abdomen more 



