398 On Aquatic Carnivorous Coleoptera or Dytiscide. 
This species is closely allied to Hyphydrus quinquelineatus, (No. 387), but 
the punctuation of the thorax and elytra is denser, and the punctures on the latter 
differ little from one another in size. The fovea at the shoulder of the elytra also 
is less deep. 
Egypt and Mount Sinai. 183. 
391. Colambus interruptus, n. sp.—Breviter ovalis, convexus, nitidus, sine 
pubescentia ; testaceus, elytris lineis fractis, nigris ; elytris fortiter sub-irregulariter 
punctatis. Long. 3, lat 2 m.m. 
Mas, abdomine nigricante. 
This species is very similar to Hyphydrus quinquelineatus (No. 387), but it is 
paler in colour, and the elytra have their black lines more disintegrated, and the 
punctuation coarser: in colour and the marks of the elytra it greatly resembles 
Hydroporus musicus, but it is smaller and narrower, and the punctuation of the 
elytra is distinctly unequal, the punctures on the basal portion of the wing-cases 
being a mixture of coarse and fine ones. 
The front and middle tarsi are slender in each sex, and I can see no sexual 
difference in the sculpture ; some of the females are not very much smaller in size 
than H. musicus. 
Mesopotamia, Dr. Millingen. 1137. 
392, Celambus muticus, n. sp.— Ovalis, convexus, pernitidus, sine pubescentia, 
niger, prothorace medio anguste lateribusque rufescentibus, elytris testaccis lineis 
latis nigris ; femoribus piceis, tibiis tarsisque rufis, antennis testaceis articulo ultimo 
fusco ; prothorace crebre distincte punctato ; elytris basi subtiliter apice crebrius et 
fortius punctatis, stria discoidali punctorum; clypei margine crasso sed medio 
interrupto. Long. 4, lat. 23 m.m. 
This species is about intermediate between Hydroporus musicus (No. 390), and 
Dytiscus parallelogrammus (No. 416); the marks on the elytra are, the suture and an 
elongate line near it, and some more irregular marks external to these, black. The 
breast is impunctate in the middle, coarsely punctured at the sides. The ventral 
segments are rather closely punctured. I see no sexual distinctions, 
Abyssinia, (found by Raffray at Goumdet, Agaos, and Lake Tzana). 185. 
Grovp 3. 
393. Colambus chinensis, n. sp.—Oblongo-ovalis, convexiusculus, nitidus, sine 
pubescentia, pectore abdomineque nigris, capite thorace pedibusque ferrugineis, hoc 
basi nigricante, elytris obscuris, basi parce apice crebre punctatis, basi seriebus 
te) z) ? ? 
