HENICOCEPHALUS. 159 
This extraordinary genus contains fourteen described species, half of which are 
American *. Six are known to me from Central America, five of them being here 
treated as new. Some authors (including Westwood) describe the intermediate and 
hind tarsi as 3-jointed ; but there are in reality only two joints—a short basal and a 
long apical one. I am unable to distinguish the sexes. 
The anterior tarsi in some species have two long claws at the apex, and in others 
(including H. jflavicollis, Westw.) one only. The tarsi themselves are retractile 
inwards, and the insect is thus enabled to grasp its prey between the long claw or 
claws and the sharp tibial spurs. The anterior tibie are more or less grooved along 
their inner face towards the apex. 
The six Central-American species may be tabulated thus :— 
a. Discal cell of the elytra closed ; posterior lobe of the head transverse, 
dull, pilose. [Hymernocoris, Uhl. | 
a’, Anterior tarsi with two long claws. 
a", Antenne with joints 1 and 2 much stouter than the others, the 
latter very slender; pronotum deeply emarginate behind ; pos- 
terior lobe of the head strongly transverse ; ocelli very small ; 
pilosity of the head and pronotum short; legs unicolorous . . concolor, n. sp. 
6", Antenne with the two basal joints a little stouter than the others ; 
pronotum less deeply emarginate behind; posterior lobe of the 
head moderately transverse; ocelli prominent; pilosity of the 
head and pronctum long; legs annulate . . . .. . . annulipes, n. sp. 
b!. Anterior tarsi with a single long claw; posterior lobe of the head 
strongly transverse; pronotum deeply and angularly emarginate 
behind. 
c', Antenne elongate, the three outer joints slender; ocelli very small ; 
pilosity of the head and pronotum close; intermediate lobe of 
the pronotum broad and as long as the posterior lobe . . . . pilosus, n. sp. 
d", Antenne much shorter, the two outer joints slender; ocelli 
prominent ; pilosity of the head and pronotum sparse ; inter- 
mediate lobe of the pronotum short, much narrower than the 
posterior lobe . . . . emarginatus, 0. sp. 
b. Discal cell of the elytra open; posterior lobe of the head subglobose, 
smooth, shining; anterior tarsi with two long claws. [Hymeno- 
pectgs, Uhl. | 
c’. Rather robust, anterior legs very stout, intermediate lobe of the 
pronotum longer than the posterior lobe . . . . - . . a@ngustatus, 0. sp. 
d', Slender, anterior legs moderately stout, intermediate lobe of the 
pronotum not longer than the posterior lobe . . . . . . . . culicis, Uhler. 
* Two others, from Venezuela, have been noticed by Dr. Bergroth (Rev. d’Ent. viii. p. 319), but he has 
not yet published descriptions of them. 
