200 HEMIPTERA-HETEROPTERA. 
This subfamily is not an extensive one, according to our present knowledge, which is 
probably exceedingly small. Two genera are found in the Neotropical Region, only 
one of which is at present recorded from Central America. 
PACHYGRONTHA. 
Pachygrontha, Germ. in Silb. Rev. v. p. 152 (1837) ; Stal, Hem. Afr. ii. pp. 146, 147 (1865). 
Pachygroncha, Spin. Gen. d’Ins. Artr. p. 140 (1852). 
Atractophora, Stal, Ofv. Vet.-Ak. Férh. 1853, p. 260. 
Peliosoma, Uhler, Proc. Ac. Philad. 1860, p. 229. 
Dilophos, Montr. Ann. Soc. Linn. Lyon (2) i. p. 226 (1865). 
The most characteristic points in this genus are the greater length of the basal joint 
of the antenne as compared with the remaining joints, the acute and ampliated outer 
apices of the lateral lobes of the head, and the pale central longitudinal levigate line 
to the scutellum. 
The genus is already recorded from the Neotropical, Ethiopian, Oriental, and Pacific 
Regions ; but our knowledge on this point is exceedingly inadequate and fragmentary, 
only one species being here enumerated, a Mexican one described by Stél—no 
examples having been received in any of the large collections made by Mr. Champion 
in. Central America. 
1. Pachygrontha edancalodes. (Tab. XVII. fig. 17.) 
Pachygrontha edancalodes, Stal, En. Hem. iv. p. 189°. 
Hab. Mexico}. 
A typical specimen in the Stockholm Museum is here figured. 
Subfam. UVYODOCHINA. 
Rhyparochromida, Stal, Hem. Afr. ii. p. 121 (1865). 
Myodochina, Stal, En. Hem. iv. p. 142 (1874). 
Myodochine, Uhler, Bull. U.S. Geol. & Geogr. Surv. iii. p. 411 (1877). 
This subfamily is thus characterized by Stal, in a differential comparison with his 
other subfamilies, “Ventris incisura tertia margines laterales haud attingente, prope 
latera recurva.” It has also been divided into five divisions. 
Division MYODOCHARIA. 
Myodocharia, Stal, En. Hem. iv. p. 142 (1874). 
In this division the thorax is always provided with a distinct collar at its anterior 
margin, and is likewise distinctly constricted about its centre, It at present comprises 
about twelve extra-European genera, of which only six are at present here included. 
