On Aquatic Carnivorous Coleoptera or Dytiscide. 355 
276. Hydroporus strigicollis, (Fairm.), n. sp.—Sat angustus, minus convexus, 
opacus, subtiliter pubescens, fuscus, thorace in medio pallidiore ; elytris subtiliter 
fere dense punctatis, coxis posterioribus sparsim sub-obsolete punctatis. Long. 2, 
lat. 1g m.m. 
I have seen only two individuals (in bad condition) of this species, and do not 
know their sex. It is readily distinguished from Dytiscus geminus, (No. 269), by 
the narrower form and darker colour; and by the basal striga of the elytra, which 
is excessively short. 
Madagascar. 145, 
277. Bidessus sordidus, n. sp.—Oblongo-ovallis, subopacus, pectore abdomineque 
nigris, prothorace testaceo, basi margineque apicali nigris ; elytris testaceis minus 
discrete fusco-signatis, sat crebre sub-obsolete punctatis ; antennis pedibusque 
testaceis, illis apicem versus plus minusve infuscatis; coxis posterioribus obsolete 
punctatis. Long. 2%, lat. 1¢ m.m. 
Very closely allied to D. geminus, (No. 269), but larger, and longer in proportion 
to the width. 
The markings on the elytra are indistinct and confused, and consist of some 
longitudinal marks more or less confluent, much as in Hydroporus confusus, 
(No. 270). 
In the male the front and middle tarsi are a good deal broader than in the female. 
Abyssinia. 73. 
278. Hydroporus lineolatus, Boh., M.C.—Oblongo-ovalis, nitidus, testaceus, 
pectore abdomineque nigris ; elytris disco irregulariter minus discrete fusco, sparsim 
subtiliter punctatis tenuissimeque pubescentibus ; coxis posterioribus fere impunc- 
tatis, Long. 2%, lat. 15 m.m. 
I have seen only two individuals (in very bad condition) of this species, which 
appears to me to be very closely allied to Dytiscus geminus, (No. 269). It is 
however rather larger, and narrower in form, more shining and more sparingly 
punctured, and has the dark marks on the elytra very indistinct. The thorax is 
nearly entirely reddish, and there is no distinct dark mark at the base of the 
elytra. 
Tam not at all sure whether this is really the species described by Boheman under 
this name ; he describes an insect having four distinct lines on each wing case ; the 
two individuals I have described scarcely agree on this point, in one of them 
scarcely any trace of dark lines is to be seen, while the other might be described 
as having two or three indistinct dark lines on each wing case. 
South Africa, (Caffraria ; Cape Good Hope). 74. 
TRANS. ROY. DUB. SOC., N.S., VOL. II. 3A 
