338 STAPHYLINIDA. 
The three individuals found in Guatemala are males, and there is some doubt 
whether the Mexican example (a female) is really conspecific with them. 
8. Quedionuchus femoralis. 
Niger, nitidus ; abdomine, palpis tarsisque piceis ; elytris subopacis, vix longioribus quam prothorax, levigatis ; 
abdomine parce punctato; femoribus posterioribus subtus ultra medium incrassatis spinisque majoribus 
armatis. 
Long. 14 millim. 
Hab. Guatemata, Totonicapam, 8500 to 10,500 feet, Quiche Mountains 7000 to 9000 
feet (Champion). 
This species is closely allied to Q. impunctus, but is of more elongate and parallel 
form, and is readily distinguished by the incrassate ridge of the hind femora; this is 
not a sexual character, as two of the three specimens found are females, and have the 
femora and their armature quite as largely developed as the third individual, which is 
a male. 
4. Quedionuchus angustus. 
Niger, nitidus; palporum articulo ultimo tarsisque rufis; capite breviter orbiculato ; elytris paulo brevioribus 
quam prothorax, subopacis ; abdomine parce punctato. 
Long. 84-9 millim. 
Hab. Guatemata, Totonicapam, 8500 to 10,500 feet (Champion). 
This is closely allied to Q. émpunctus, but is a smaller and narrower insect, with 
shorter elytra, and especially with a smaller head, so that the distance between the 
hind margin of the eyes and the neck is much less. There is merely a scarcely per- 
ceptible emargination of the last ventral plate in the male. 
Ten individuals have been found. Nine of them agree very closely inter se, but the 
tenth is a variety of larger size, with rather shorter picescent elytra, and a hind body 
also of this colour; it is a female and may prove to be a distinct species; it has some 
resemblance to Q. spinipes, but the head is of different shape, and the antenne are 
black. 
5. Quedionuchus nigerrimus. (Tab. VIII. fig. 8.) 
Nigerrimus, nitidus ; elytris levigatis, sat nitidis, multo longioribus quam prothorax ; abdomine parce punctato. 
Long. 10-11 millim. 
Hab. Guatemata, Cerro Zunil 4000 to 5000 feet, San Gerdnimo 3000 feet (Cham- 
pion). 
This is very closely allied to Q. tmpunctus, but is really distinguished by the intense 
black colour of the head and thorax, which also are very shining, and by the fact that 
the elytra have no trace of fine alutaceous sculpture. The palpi and antenne are quite 
black. The head is smaller, the eyes on the contrary rather larger than in Q. impunctus, 
