668 On Aquatic Carnivorous Coleoptera or Dytiscide. 
of black bands, they are conspicuously less numerous just at the apices ; of the 
three yellow lines or veins, the one running along the suture is the most conspi- 
cuous, the other two are sometimes only to be seen at the base, where the three 
are always united by a transverse prolongation. 
In two very small individuals (one from Cape Town the other from Natal) the 
thoracic dark mark is much reduced in size. 
South East Africa, from Cape Town to Abyssinia. 1002. 
Group 3. 
1044, Hydaticus daemeli, (Wehncke), n. sp.—Ovalis, sat latus, parum convexus, 
nitidus, niger, capite anterius testaceo, et in vertice testaceo-bimaculato ; prothorace 
elytrisque ad latera testaceo-marginatis ; antennis pedibusque anterioribus rutis, 
tibiis intermediis piceis, pedibus posterioribus nigro-piceis; elytris punctis seriatis 
conspicuis. Long. 14, lat. 8 m.m. 
This species appears to be a very distinct one; the yellow band along the side ot 
the elytra is somewhat irregular in its posterior half, being dotted with black and 
with its inner edge irregular ; at the apex however it quite reaches the suture. The 
species resembles somewhat the larger and flatter varieties of Dytiscus vittatus 
(No. 1049), but can easily be distinguished by the yellow band at the extremity 
attaining the suture. The posterior legs are short and thick, and the cilize of the 
hind margins of the joints of the posterior tarsi elongate. I do not know the male ; 
the female has a very few coarse ruge on the thorax near the sides. 
Australia, (Cape York). 1039. 
1045. Hydaticus bivittatus, Lap., M.C.—Ovalis, parum latus, nitidus, capite 
anterius testaceo, posterius nigro, thorace testaceo, basi in medio nigro, elytris 
nigris, margine laterali vittaque recta, integra, ad suturam sat approximata tes- 
taceis ; corpore subtus piceo, antennis pedibusque quatuor anterioribus rufis ; elytris 
punctis seriatis minutis, numerosis. Long. 14, lat. 72 m.m. 
In the male of this species the fringing hairs on the front tarsi are moderately 
well developed. The female sometimes has a few deep irregular impressions 
towards the sides of the thorax, but sometimes is without any peculiar sculpture. - 
The position of the internal longitudinal band which is parallel with the suture 
and nearer to it than to the outer margin readily distinguishes this species from all 
varieties of Dytiscus vittatus (No. 1049); besides this the thorax is in greater 
part yellow, the cilize on the hind margins of the posterior tarsi are much shorter, 
and the fringing hairs on the male front tarsi are longer than in D.vittatus. 
