ACTOBIUS. 459 
(Hoge); GuATEMALA, near the city, San Gerdénimo, Torola, Senahu, Balheu, Tactic, 
Panajachel 5000 feet, Cerro Zunil 4000 feet (Champion); Panama, San Miguel in the 
Pearl Islands (Champion). 
This is a slender species, with rather long and narrow head. The antenne are rather 
slender with the tenth joint nearly as long as broad, the terminal joint elongate. The 
oblong thorax is quite straight at the side, and bears numerous distinct but not coarse 
punctures, a space along the middle being smooth; the elytra are elongate, a good deal 
longer than the thorax, their punctuation rather fine and somewhat distant, and have a 
scanty flavescent pubescence ; the hind body has also a flavescent pubescence. The legs 
are pale yellow, the front tibie slightly fuscescent, and the coxe fuscous. The male 
has the front tarsi a good deal dilated, and a slight emargination of the last ventral 
plate; the surface in front of the emargination is, as it were, obliquely shaved off. 
A large number of examples have been found, and amongst these a considerable 
number of variations, but I have not been able to discriminate more than one species ; 
the most remarkable of the varieties is an example from Puebla, in which the elytra are 
shorter, and the punctuation of the head and thorax more obsolete than in the type. 
The flavescent hind margin of the elytra is always very narrow, and in immature 
examples appears merely as a picescent condition of the posterior part of the wing-cases. 
5. Actobius agnatus. 
Philonthus agnatus, Er. Gen. et Spec. Staph. p. 513'*; Solsky, Hor. Soc. Ross. v. p. 1877’. 
Actobius agnatus, Horn, Tr. Am. Ent. Soe. xi. p. 229°. 
Hab. Nortu America, Louisiana !.—Mexico ?.—Sovuta AMERICA, Colombia’. 
I have not seen any example from within the limits of our fauna agreeing with 
Erichson’s description. A. arduus is probably nearest to A. agnatus, but among the 
numerous variations of the former species there is none that accords with the description 
alluded to. 
6. Actobius simplex. 
Angustulus, parallelus, fuscus ; capite elytrisque nigricantibus ; pedibus sordide testaceis, coxis concoloribus; 
antennis gracilibus ; capite, thorace elytrisque crebrius punctatis. 
Long. 53 millim. 
Hab. Mexico, Mirador (H6ge). 
Antenne slender, black, with the base only indistinctly paler, the tenth joint quite 
as long as broad. Head rather long and narrow, with rounded hind angles. Thorax 
narrow and elongate, with its punctuation coarse and rather close, so that the smooth 
space along the middle is unusually definite. Elytra elongate, black, finely but not 
very closely punctate. Hind body fuscous red. 
The male front tarsi are moderately dilated, the last ventral plate only very slightly 
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