64 MALACODERMATA. 
been captured. The seventh ventral plate is wide, subtruncate, raised in the middle, 
from which proceed, between it and the dorsal plate, both a superior and an inferior 
short styliform lobe or plate. 
This insect is, perhaps, not luminous. 
2. Phengodes fusca. 
Nigra; ore pedibusque basi piceis ; capite, prothorace et scutello rugose crebre punctatis ; abdominis segmentis 
sexto et septimo ventralibus medio albis, nitidis. Long. 14 millim. 
Hab. Costa Rica, Rio Sucio (Rogers). 
This species is altogether more like the species which I have identified with 
P. pulchelia, Guérin. It differs from that in being darker and more roughly punctured ; 
the thorax is narrower, and without the thin expanded margin of the last species ; the 
elytra are longer in proportion and not so reduced at their tips. The antenn are 
more like those of P. pulchella (though broken in the unique specimen sent by Rogers) ; 
that is to say, the filaments, which are longer than in P. bimaculata, curl at their ends 
in a similar way, probably after death. But it is more especially in its apparent lumi- 
nosity that this species shows affinity to the Colombian insect; and of this I feel no 
doubt after examining the diaphanous segments. 
3. Phengodes nigricornis. 
Ferruginea ; antennis, palpis, pectore pedibusque nigris ; prothorace crebre sat fortiter punctato, nigro variegato, 
medio obsolete breviter canaliculato, scutello nigro apice ferrugineo ; abdominis segmentis singulis supra et 
infra nigro maculatis. Long. corp. 13-14 millim. 
Hab. Mexico, Parada (Sallé). 
Head dark rusty red, coarsely and confluently punctured, its base with irregular 
ruge ; eyes of moderate size; mandibles pitchy. Antenne almost as long as the body, 
entirely black, as well as the palpi. Thorax as long as wide, with rounded sides, a 
little constricted in front, subopaque owing to the very close puncturing ; the marginal 
edge very little expanded, and the hind angles acute but not much produced. The 
disk bears a fine longitudinal impression deep in the centre. The elytra are entirely 
red. The legs black, only the anterior coxe and the femora are marked with red at 
their bases. The abdomen is not so prolonged in either of the two specimens which I 
refer to this as in P. plumosa or P. bimaculata; but each segment has the central 
portion of the base black; on the dorsal surface this marking is reduced to two spots, 
excepting on the apical and subapical plates. 
The species of this genus are evidently variable in the colour of most of their organs. 
The basal joint of the antenne and the elytra seem to be fairly constant; and the form 
of the thorax and its puncturing seem to justify me in separating this species from the 
one which follows. 
