STAMNODERUS.—PADERUS. 609 
the narrow anterior portion elongate ; densely rugose-punctate, with a fine longitudinal 
carina, and a lateral depression near the base. Elytra densely punctate. Hind body 
coarsely and closely punctate, the punctuation towards the extremity obsolete. Front 
femora greatly dilated, with a slight angular projection armed with a porrect seta near 
the base ; tibie slender, strongly curvate. The male has the terminal ventral segment 
broad, excised behind. 
Four specimens of this curious insect were obtained by beating the thatch of a hut 
in the dense forest. Our figure represents a female. 
Group PADERINA. 
This group is characterized by the broad fourth joint of the middle and hind tarsi 
being deeply excavated above for the reception of the terminal joint, and more or less 
emarginate at the tip. The front coxal cavities are largely membranous above, in 
striking contrast to the ‘Suniina’; the group, indeed, is much more nearly allied to the 
genera near Lithocharis than to Sunius, with which it is usually associated. 
PADERUS. 
Pederus, Fam. III., Gravenhorst, Mon. p. 142. 
Pederus, Curtis, Brit. Ent. iii. t. 108; Erichson, Gen. et Spec. Col. p. 619. 
This genus is one of the best defined of the Staphylinide, and comprises at present 
about one hundred or rather more species, and is widely distributed in each hemisphere. 
The species of the group having a bright-red hind body tipped with black are numerous, 
and found in all parts of the world, and are so similar to one another that they can only 
be certainly discriminated by examining the cedeagus, which presents frequently great 
differences in species appearing externally almost perfectly similar. 
The brachypterous species are arboreal in their habits, according to Mr. Champion. 
§ 1. Brachypterous species, with the shoulders of the elytra but little prominent ; 
hind body more or less dilated. 
1. Pederus alticola. (Tab. XVI. fig. 1.) 
Major, latiusculus, niger; elytris brevibus et angustis, cyaneo-viridibus ; antennis, palpis, tarsis abdominisque 
segmentis duobus ultimis rufis. 
Long. 17 millim. 
Hab. GuatemaLa, Totonicapam 8500 to 10,500 feet, Volcan de Agua 8500 to 
10,500 feet (Champion). 
Antenne slender, very long, unicolorous yellow, the penultimate joint quite twice as 
long as broad; palpi clear yellow; mandibles piceous. Head broad, sparingly and 
coarsely punctured. Thorax rather longer than broad, much narrowed behind, rather 
coarsely, sparingly punctate, with a broad space along the middle impunctate. Elytra 
BIOL. CENTR.-AMER., Coleopt., Vol. I. Pt. 2, October 1886. 4A TJ 
