446 STAPHYLINIDA. 
The male has the head very peculiarly formed, the vertex above being truncate, and 
connected with each angle of the truncature there is a broad obscure channel, which is 
finely punctate; at the back there is a deep excavation on each side, and in front of - 
this on each side a patch of very short minute pallid pubescence; there is a very 
slight emargination of the last ventral plate. 
A good series was found near Guatemala city, three examples at Capetillo ; the figure 
represents a male. 
17. Pederomimus cephalax. 
Rufus; capite superne eneo-fusco; elytris (basi excepta) abdomineque ante apicem nigris; antennis pedibus- 
que testaceis, illis in medio obscuratis; prothorace seriebus dorsalibus fortiter 6-punctatis ; elytris basi 
dense, apice parce, punctatis. 
Long. 8 millim. 
Hab. Panama, David (Champion). 
Head rather broad (especially in the male), bearing only a few coarse punctures. 
Antenne rather long, a little thickened externally, the middle joints slightly darker 
than the others, the tenth joint about aslong as broad. Thoraxlongand slender. Elytra 
black, not broadly red at the base. Hind body with the two penultimate segments 
more or less deep black, the hind margin of the penultimate yellow; the terminal 
segment and the apical styles yellow, each more or less infuscate behind. 
The male has the head larger than the female and tumid beneath, the submentum 
very large, and the convergent lines of the gens more separated than usual, so that 
they do not meet till the hind margin is attained. In the female the structure of the 
head is normal. The male has also an extremely slight emargination of the last 
ventral plate. 
Leaving aside the remarkable structure of the head in the male, this species has a 
considerable resemblance to P. ornatellus, but is much less slender, and has rather 
shorter and thicker antenne, and the head is paler. The intensity of the black colour 
on the posterior part of the hind body is apparently variable. 
18. Pederomimus nigripennis. (Tab. XI. fig. 22.) 
Rufus ; elytris, metasterno antennisque in medio nigris; femoribus apice, tibiis abdomineque ante apicem plus. 
minusve nigricantibus ; antennis articulis tribus ultimis flavis; elytris parce punctatis. 
Long. 7 millim. 
Hab, Panama, Bugaba 800 to 1500 fect, Volcan de Chiriqui from 2000 to 4000 feet 
(Champion). 
Antenne rather long and slender ; the three basal joints red, the next five black, the 
terminal three clear yellow; the penultimate joints rather longer than broad. Head 
rather narrow, quite rounded behind, bearing distant moderately coarse punctures. 
Thorax much narrowed behind, the five punctures of the dorsal series and the five 
