PTORTHODIUS. 107 
evidently twelve-jointed, as will appear evident from there being eight pairs of rami, 
and that the basal three and the terminal joint have none; the latter, however, is 
closely articulated with the preceding joint, and the division is not distinct. 
1. Ptorthodius mandibularis. 
Testaceus; capitis vertice tumido nigro, mandibulis apice, antennis elytrisque piceis, his plaga discoidali 
testacea ; alis fuscis. Long. 8 millim. ¢? 
Hab. Panama, Volcan de Chiriqui (Champion). 
Of all the small biramose species that I have yet seen of this group, this most 
resembles a Phengodes; the head is strongly raised behind and between the tubercles 
which give rise to the antenne, and at this part is pitchy black and sparsely punctulate ; 
the palpi, front of the head, and mandibles, except at their tip, are testaceous. 
The basal joint of the antenne is stout, equal in length to the second and third taken 
together ; and these three are pale beneath, fuscous above; the third to the eleventh 
joint gradually increase in length; each of them emits a long ramus, from three 
to four times the length of each joint, from its base on each side. ‘The thorax is 
oblong, its lateral margin ends in front in a transverse constriction; the hind angles are 
square, a little turned outwards; it is shining, testaceous, with scattered punctures. 
The elytra have the suture more or less open, being narrowed from their bases; their 
tips are pale. The legs are entirely pale testaceous, the joints of the tarsi simple, the 
claws only a little dilated on their inner edge near the base. The apical segments of 
the abdomen are elongated and acuminate, not closely applied to each other, but more 
or less gaping or crossing and overlapping. 
This insect is very like Euryopa singularis; but, in addition to its tumid head and 
smaller eyes, the antenne are longer, with longer joints, and long (not rudimentary) 
rami. Three specimens taken by Mr. Champion at Chiriqui are all that I have seen. 
2. Ptorthodius ramosus. (Tab. VI. fig. 12.) 
Niger, opacus; capite quali, antice sordide ferrugineo ; elytris subgranulosis. Long. 73 millim. ¢. 
Hab. GUATEMALA, Quiche Mountains (Champion). 
The characters which separate this from Ewryopa nigra are very much such as I have 
noticed distinguish P. mandibularis and E. singularis ; yet I do not think there is evidence 
enough to connect them as sexes of one species. The colour and rough opaque texture 
are the same ; but the antenne have longer joints, with long rami. The head is not raised 
as in P. mandibularis; the only difference I see between the head of this species and 
that of HL. nigra is that the eyes are smaller and more prominent. 
Two specimens are assignable to this description, in one of which the head 1s 
quite black. 
P 2 
