140 GEO. H. HORN, M. D. 



Anterior outer claw toothed and pectinate. 



Outer anterior claw with a feeble tooth at middle. Posterior tarsi short 



and densely pubescent beneath scopariiis. 



Outer anterior claw toothed near the tip. Posterior tarsi long and 

 normally hairy. 

 Tooth of anterior claw large. Posterior claws very distinctly pecti- 

 nate mucoreus. 



Tooth of anterior claw small. Posterior claws very feebly pecti- 

 nate obtustis. 



II. — Claws not pectinate, rarely feebly crenulate, always with a small tooth 

 at middle. 



Thorax opaque opacicollis. 



Thorax more or less shining. 



Head cribrately punctured. Thorax coarsely and anteriorly densely 



punctured sociatus. 



Head coarsely, not very densely punctured. Thorax sparsely and not 



conspicuously punctured Talsus. 



III. — Claws similar on all the tarsi and absolutely simple fiiiibripes. 



The following species are not found in the above table no males 

 being known, densicollis, senex, timidus. 



Table for the distinction of Tcnoion females. 

 I. — Anterior claws with a strong tooth near the tip, serrulate posteriorly. 



Posterior claws similar, each dentate at middle and serrulate at base. 

 Pygidiura transversely impressed near the tip. Front nearly flat. 



Margin of pygidium at tip prolonged (iisparilis. 



Margin at tip not prolonged scoparius. 



Pygidium slightly gibbous near the tip. Front impressed. 



densicollis. 

 Posterior claws dissimilar, the inner serrulate, the outer dentate and 

 serrulate. 

 Pygidium rather flat, a fine impressed line at middle near the tip, 



margin at apex prolonged mucoreus. 



II. — Claws with a small tooth at middle and at most obsoletely serrulate 

 at base. 



Thorax opaque opacicollis. 



Thorax shining. 



Thorax coarsely punctured, more densely in front. 



Margin of thorax strongly crenulate SOCiatns. 



Margin of thorax entire timidus. 



Thorax sparsely punctured over entire surface. 



Pygidium oval at tip falsns. 



Pygidium truncate at tip fiiubripes. 



III. — Claws absolutely simple on all the tarsi. 



Pygidium without marginal line. Hind tarsi long seuex. 



Two species obtusiis and puherulus do not appear in the above table, 

 their females being unknown. 



The following table is based on characters not sexual and is given 

 merely to attempt to fill the blanks which have of necessity occurred 



