668 On Aquatic Carnivorous Coleoptera or Dytiscidce. 



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 rufis, 

 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 of 

 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 cilia3 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 rugae 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 

 nigiis, margine laterali vittaque recta, integra, ad suturam sat approximata tes- 

 taceis ; corpore subtus pi ceo, antennis pedibusque quatuor anterioribus rufis ; elytris 

 punctis seriatis minutis, numerosis. Long. 14, lat. 7h 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 ciliae 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. 



