530 Mr. G. J. Arrow on 
and the West African Trichius podicalis and tristiculus of 
Kraatz, the only members of the genus hitherto known from 
Africa. It is larger than those species, the colour of the 
upper surface is not black, but a greenish-brown, and the 
pattern is different. The pronotum has no median stripe, 
the pale lateral border has a dark spot in the centre, and the 
elytra, instead of six scattered pale spots, as in 7. podicalis, 
have only the humeral margin and (in the female) a small 
transverse median spot pale. The propygidium is pale and 
the pygidium is of the dark colour of the elytra, with the 
apex pale, the pale area ending above in three narrow 
finger-like rays. 
The male is rather smaller, shorter, and more compact 
than the female, the thoracic border is more sharply defined, 
and the elytra are without the median spot. The latter 
difference is probably a constant one, five female specimens 
showing the pale mark, while two females are without it, 
and Mr. F. R. Mason informs me that this is so with another 
male in his collection. The three teeth of the front tibia are 
sharp in the male, the hind tarsi are slightly longer than 
those of the female, and the abdomen is a little less exposed 
beyond the elytra. The club of the antenna scarcely differs 
in length in the two sexes. 
This insect (and probably also the allied species, 
T. podicalis and tristiculus, which are unknown to me) 
differs considerably from the other members of the genus in 
general appearance. It is more solidly built, the legs are 
shorter, the front tibiz being very short and broad, with a 
strong third tooth placed at the middle of the outer edge or 
alittle behind it. The hair of other Trichii is replaced by 
very short stiff sete, which become broad scales upon the 
lower surface. 
Calometopus transparens, sp.n. (PI. VIII. fig. 5.) 
Niger, elytris translucentibus, flavescenti-hyalinis, nigro-margina- 
tis, corpore setis et squamis albidis supra et subtus ornato, 
pronoto utrinque maculis tribus disvoidalibus duabusque mar- 
ginalibus, abdominis dorso transverse fasciato, pygidioque vitta 
alba mediana, medio anguste bisecta; angustus, pedibus gracili- 
bus, capite magno, clypeo subquadrato, antice valde bilobato, 
pronoto quam longitudinem paulo latiori, angulis obtusis ; 
scutello longo, acuto; elytris deplanatis, setis longitudinaliter 
ordinatis instructis costaque humerali valida integra, postice 
attenuatis, apice rotundatis; pygidio ruguloso; pedibus graci- 
libus; 
