On Aquatic Carnivorous Coleoptera or Dytiscide. 353 
antennis basi testaceo apice fusco, pedibus testaccis, tibiis posterioribus apice 
fusuis ; coxis posterioribus sparsim obsolete punctatis. Long. 23, lat. 13. m.m. 
The sexes differ very little externally, in the male, however, the front and middie 
tarsi are slightly broader than in the female. 
The specimens found in Algeria are rather smaller and broader, and have the 
mark on the elytra rather less in extent, and the punctuation of the elytra more 
sparing ; but they cannot be considered a distinct species, as intermediate forms 
occur in Spain. 
Europe : apparently rare in Northern Europe, but recorded from 61° in Finland by Sahlberg. Algeria, 
Syria. 64, 
270. Hydroporus confusus, Klug, Symb.. Phys. IV, t. 34, f. 4.—Oblongo-ovalis, 
subparallelus, testaceus, vertice, prothoracis basi medio, pectoreque infuscatis, 
abdomine nigricante; elytris fusco-signatis, signaturis anterius divisis et pro- 
longatis, sparsim obsolete punctatis ; coxis posterioribus obsolete punctatis. Long. 
2, lat. 1 m.m. 
This species is very closely allied to Dytiscus geminus, (No. 269), but is smaller, 
narrower, and more parallel, and is more brightly coloured. 
Though the Hydroporus confusus Klug, was considered by Schaum as not suffi- 
ciently different from Dytiscus geminus, it appears to me probable that it is really 
a distinct species. 
Egypt, (Cairo). 66. 
271. Hydroporus pentagrammus, Schaum, M.C.—Oblongo-ovalis, testaceus, pro- 
thorace basi medio, abdominis pectorisque lateribus plus minusve infuscatis ; elytris 
sutura lineisque duabus posterius conjunctis fuscis, crebre obsoletissime punctulatis, 
subopacis : coxis fere impunctatis. Long. 2, lat. 1 m.m. 
Closely allied to Hydroporus confusus, but yet narrower, and more brightly 
coloured, the elytral markings consist of two dark lines, which are joined together 
behind, but are throughout quite distinct from the sutural mark. 
Egypt. 66. 
272. Hydroporus thermalis, Germ., M.C.—Oblongo-ovalis, testaceus, pectore 
abdomineque infuscatis ; elytris sutura lineisque duabus fuscis, interna apice hamata, 
externa valde abbreviata, sparsim obsolete punctatis ; coxis posterioribus parce 
obsolete punctatis. Long. 2, lat. 1 m.m, 
In this species the thoracic line can scarcely be said to be continued on to the 
elytra; the continuation is, however, represented by a small fovea or elongate 
