458 Goleopterological Notices, VI. 



employed to isolate certain aljenant foiiiis. as may l»t* seen from 

 the following table : — 



Elytral epipleiiric distiuctly (Iftiiiod, at least toward base 2 



Elj'tral epipleurae completely obsolete 13 



2 — Epistoma obsolete, the frontal edge finely beaded tln'ou<;hout the widtli. 



Pi'istoscelis 



Epistoma distinct and generally well developed 'A 



3 — Ungual appendages mntnally eiiual or nearly so, variable in development.. .4 

 Ungual a])pendages extremely nnecinal, the inner long and attached to the 

 claw nearly throughout its length, the outer very rudimentary or alto- 

 gether obsolete; pronotum constantly A\ith a submarginal excavated 



line 11 



Ungual appendages completely obsolete on both claws 12 



4 — The appendages attached to the claws nearly throu;;li(>ut their own 



1 ength 5 



The appendages detached and free nearly throughout tlieir lengtli, liUt well 



developed and as long as the claws 10 



5 — Appendages well developed, as long as the claws or very nearly (i 



Appendages very short and nidimentary 9 



6 — Anterior tibiix? beset externally with stout spinules 7 



Anterior tibite devoid of spinules, or with the latter few in number and very 



slender 8 



'V — Epipleuiiv broad and horizontal, abruptly vanishing at or very near the 

 elytral apex. 



Apical angles of the prothorax anteriorly prominent Euda§yte!>i 



A])ical angles not pronunent Asydates 



Ei)ipleuric narrow, wider toward base, more or less strongly reflexed in plane 

 throughout their length. 

 Antennic short and not pilose. 



Side margins of the prothorax not serrate Ti'iclioclirous 



Side margins strongly serrate C'radytes 



Antennae long, strongly serrate and clothed v\ ith long sparse and hexible 



hairs Sydatopsis 



S — Ungiuil appendages slightly abbreviated and uneiiual, acutely jjointed. the 

 autenn:e long and strongly serrate; tibia? with slender setiform spinules. 



Sydates 

 Ungual appendages generally fully as long as the claws : tibiie without spin- 

 ules, except occasionally and inconspicuously in Listrus. 



Prothorax broadh- constricted near the apex ListroiuilllllS 



Prothorax not at all constricted anteriorly. 

 Pronotum without a submarginal line. 



Prothorax not dilated and serrulate at the sides toward Itase. 



Adasytes 

 Prothorax dilated posteriorly and minutely serrulate at the sides. 



Listrus 



