458 Goleopterological Notices, VI. 



emplo_yed to isolate certain aberrant forms, as may be seen from 

 the following table : — 



Elytra! epipleiiraj distiuctly fleflned, at least toward base 2 



Elytral epipleurai completely obsolete 13 



"2 — Epistoma obsolete, the frontal edge finely beaded throughout the width. 



Pristoscelis 



Epistoma distinct and generally Avell developed 8 



3 — Ungual appendages mutually equal or nearly so, variable in development... 4 

 Ungual appendages extremely unequal, the inner long and attached to the 

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

 gether oljsolete; pronotum constantly with a sulnnarginal exca,vated 



line 11 



Ungual appendages completely obsolete on both claws 12 



4 — The appendages attached to the claws neaiiy throughout their own 



length 5 



Tlie appendages detached and free nearly throughout their length, but well 



developed and as long as the claws 10 



5 — Appendages well developed, as long as the claws or very nearly 6 



Appendages very short and rudimentary 9 



6 — Anterior tibiiB beset externally with stout spinules 7 



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



slender 8 



I — Epipleura.' broad and horizontal, abruptly vanishing at or very near the 

 elytral apex. 



Apical angles of the prothorax anteriorly prominent Eudasytes 



Apical angles not prominent Asydates 



Ei>ipleurai narrow, mder toward base, more or less strongly reflexed in jilane 

 throughout their length. 

 Antenna? short and not pilose. 



Side margins of the prothorax not serrate Tricliocliroiis 



Side margins strongly serrate t'radytes 



Antennae long, strongly serrate and clothed Avith long sparse and flexible 



hairs Sydatopsis 



S — Ungual appendages slightly abbreviated and unequal, acutely pointed, the 

 antenna; long and strongly serrate; tibine with slender setiform spinules. 



Sydates 

 Ungual appendages generally fully as long as the claws ; tibios without spin- 

 ules, except occasionally and inconspicuously in Listrus. 



Prothorax broadly constricted near the apex Listroilliiiius 



Prothorax not at all constricted anteriorly. 

 Pronotum without a submarginal line. 



Prothorax not dilated and serrulate at the sides toward base. 



Adasytes 

 Prothorax dilated posteriorly and minutely serrulate at the sides. 



