430 STAPHYLINIDZ. 
3. Belonuchus alternatus. (Tab. XI. fig. 10.) 
Elongatus, depressus, nitidus, rufus; capite cum antennis abdominisque segmentis tribus nigris, abdominis. 
_apice flavo. 
Long. 11 millim. ; 
Hab. GuateMaua, near the city, San Gerénimo (Champion); Nicaragua, Chontales 
(Janson) ; Panama, Bugaba (Champion). 
Antenne blackish, with the terminal joint ferruginous; palpi red, the second joint of 
the maxillary pair piceous. Head black, without sericeous reflection. Thorax rather 
bright red, without sericeous reflection ; elytra paler red, as also the two basal abdo- 
minal segments; the three next segments deep black; the hind margin of the 
penultimate segment, the whole of the terminal segment, and the armature clear 
yellow. 
This is excessively closely allied to B. dichrous, but differs in having the two basal 
segments of the hind body red, and in some of the minute details of colour, such as the 
absence of the peculiar reflections seen in certain lights on the head and thorax of the 
former species. There is scarcely any external difference between the sexes perceptible. 
The figure is taken from a small female found at Bugaba. 
4, Belonuchus flavipennis. 
Belonuchus flavipennis, Solsky, Bull. Soc. Mosc. 1868, xlii. p. 263°. 
Hab. Mexico ! (Flohr, Sallé), Mirador, Oaxaca (Hoge). 
Although very similar to Philonthus celatus and to Belonuchus simplex, this species is 
readily distinguished, when fully extended, by the fact that the medial lobe of the 
armature and the bases of the anal styles are white; the thoracic series is regularly 
quadripunctate, the punctures being placed on the front half of the thorax, and the 
surface of the head and thorax present a remarkably conspicuous sericeous reflection. 
The male is still unknown. 
Apparently rare, only one example being present from each source. 
5. Belonuchus bidens. (Tab. XI. fig. 11.) 
Niger; pectore elytrisque rufis, abdominis apice pallide flavo; antennarum basi apiceque, palpis pedibusque- 
testaceis. 
Long. 18 millim. 
Hab. Mexico, Jalapa (Flohr), Oaxaca, Mirador (Hoge), Tuxtla (Sailé) ; Nicaragua, 
Chontales (Belt). 
Mandibles very elongate, piceous. Antenne short, the penultimate joints rather 
strongly transverse, the three basal joints and the terminal one yellow. Head trans- 
versely subquadrate, black, very coarsely punctate, with a broad space on the middle 
impunctate. Thorax short, quadrate, slightly narrowed behind, on each side of the 
