716 STAPHYLINIDZ, 
10. Piestus crassicornis. (Tab. XIX. fig. 6.) 
Niger, opacus, dense punctatus, rugosus ; prothorace lateribus obtuse tridentatis ; antennis elongatis et crassis.. 
Long. 54 millim. 
Hab. Panama, Volcan de Chiriqui 4000 to 6000 feet (Champion). 
Head densely rugose; clypeal suture fine and obsolete; antennary tubercles very 
elevated. Thorax greatly constricted behind; the sides much rounded and narrowed in 
front, and with three prominent but obtuse teeth about the middle; the surface densely 
and coarsely rugose, depressed laterally for nearly the whole length. Elytra each with,. 
including the sutural elevation, seven fine raised coste, the second, fourth, and sixth of 
which are more obsolete than the others. Hind body densely punctured. 
Of this remarkable species we have received only one example. Although the 
antenne are remarkably long and thick, the individual is probably a female; it agrees 
with P. angularis in possessing a coarsely punctate metasternum, but differs from that 
species by the thorax being less transverse, more narrowed, and rounded in front, and 
with larger and more prominent and more obtuse teeth, as well as in smaller details of 
colour and sculpture. 
ANCZKUS. 
Anceus, Fauvel, Bull. Soc. Linn. Normand. ix. p. 60, t. 1. ff. 18-17 (1865); Notices ent. ii. p. 56. 
Holotrochus (pars), Sharp, Tr. Ent. Soc. Lond. 1876, p. 387. 
This genus was established for an insect from our region, and its author has since 
added to it a second species from New Guinea, and Leconte three others from North 
America. It is one of the numerous links between the “ Piestini” and “ Oxytelini” of 
Erichson: if the structure of the coxee be taken as the point of distinction between the 
two groups, then the genus belongs to the latter near Holotrochus, from which it differs 
in the structure of the front of the head, in which latter respect it is nearer to Lispinus. 
Holotrochus clavipes and H. fauveli, Sharp, belong to Anceus, as I anticipated would 
prove to be the case when I described them. Fauvel, though the author of the genus, 
appears to be very uncertain about its characters, as in his recent Notices ent. vii. p. 16, 
he refers A. rufescens, Lec., and the other two North-American species of Ancewus to 
Lispinus: there can be no doubt, however, that A. rufescens is an Anceus; the other 
two North-American species are unknown to me. 
1. Anczus crassicornis. (Tab. XIX. fig. 7.) 
Piceus, pedibus rufis; politus, levigatus; prothorace quam latitudo breviore, lateribus basin versus fortiter 
angustatis sinuatisque, medio vix perspicue canaliculato ; elytris quam prothorax multo longioribus. 
Long. 43 millim. 
Hab. Guatemata, Cubilguitz 1000 feet (Champion). 
Antenne extremely stout, the eight terminal joints transverse. Mandibles very long, 
