438 STAPHYLINIDA. 
2. Chroaptomus regalis. (Tab. XI. fig. 8.) 
Parce punctatus, nitidus, niger ; capite thoraceque violaceis; elytris splendidis viridi-auratis vel purpureis. 
Mas. Capite latiore, anterius in medio depresso et coriaceo-opaco, minute foveolato ; labro fisso, opaco, in medio 
late membranaceo. 
Fem. Capite in medio potius late canaliculato, vix foveolato ; labro nitido, dimidiis haud distantibus. 
Long. 14 millim. 
Hab. Panama, Bugaba 800 to 1500 feet, Volcan de Chiriqui 4000 to 6000 feet, 
Caldera 1200 feet (Champion). 
Very closely allied to C. flagrans, but rather larger and broader, and with the head 
in the male differently formed in front. 
About two dozen examples were captured in the State of Panama; although so 
extremely similar to P. flagrans, I have no doubt of its being distinct, as I have 
examined more than 150 individuals of the latter species without finding any inter- 
mediate. A male from the Volcan de Chiriqui is figured. 
PZDEROMIMUS. 
Corpus gracile, late coloratum. Prosternum ante coxas carinato-divisum. Prothorax linea elevata laterali 
valde deflexa superne invisa, a seta laterali longe remota. Coxe intermedie distantes. 
This genus is established for some elegant insects peculiar to the Tropical-American 
fauna, the few species hitherto known having been placed with Philonthus—from 
which genus they may be distinguished by the fact that the prosternum in front of the 
coxe is definitely divided transversely into two parts, which have a different texture, the 
posterior portion being frequently strigose, and serving probably in conjunction with the 
cox as a more or less rudimentary organ of stridulation. ‘The side piece of the 
prothorax is small, and is not inflexed as in Philonthus. ‘The genus comprises, in 
addition to the species enumerated in the following pages, P. /wtus and P. lustralis, Er., 
and P. wniceps, cognatus, traili, capitalis, lustrator, eneicollis, palpalis, aberrans, con- 
formis, propinquus, regellus, abactus, and longipes, Sharp. 
There are three groups of species in the genus, viz.:—1. The first seven species of 
the following series; these are comparatively large and beautifully variegated insects, 
having slender and elongate palpi, the middle joint of the labial pair being more or less 
elongate, and longer than the terminal joint, while the basal joint of the hind tarsus is, 
though elongate, more or less shorter than the apical joint. P. nigrinus is a very aberrant 
species described from a mutilated example, and not apparently a member of either of 
the groups. 2. A group comprising the species numbered 9 to 13, and of which 
P. angularius, Ey., may be taken as the type; they are rather depressed and less 
elongate insects, with the thorax truncate or nearly so in front, its anterior angles 
distinct, the transverse division of the thorax less marked, the palpi rather slender, but 
the intermediate joint of the labial pair not longer than the terminal joint, and the basal 
joint of the hind foot about equal to the apical; this group approaches closely to some 
of the Belonuchi, but is also nearly allied to the next by P. simplex. 3. A group for 
