354 On Aquatic Carnivorous Coleoptera or Dytiscide. 
puncture. The external dark line on the wing case though very short, is generally 
very distinct and definite, but sometimes becomes connected with the more elongate 
internal line. 
Arabia, Persia, Egypt, Algeria, Southern Europe. 68. 
273. Bidessus major, n. sp.—Oblongo-ovalis, subtus niger, supra nigro testaceoque 
variegatus, antennis pedibusque testaceis ; prothorace sparsim distincte punctato, 
medio testaceo, basi margineque apicali fuscis; elytris versus suturam distincte sat 
erebre punctatis; coxis posterioribus parce subtiliter punctatis. Long. 3, lat. 
1i m.m. 
This species is very similar to Dytiscus geminus, (No. 269), but is more than 
twice as large, and the punctuation of the upper surface is rather coarser. 
Arabia ; Persia. 69. 
274. Hyphydrus hamulatus, Gyll., Hydroporus hamulatus, M.C._—Oblongo- 
ovalis, opacus, testaceus, abdomine infuscato, elytris lineis duabus crassiusculis 
fuscis, Interna apice hamata, externa abbreviata; elytris densissime eequaliter 
subtiliter punctatis : coxis posterioribus obsolete punctatis. Long. 2, lat. 1 m.m. 
The pubescence of the upper surface is very fine but distinct ; the thorax is rather 
closely, finely and evenly punctured, but not so densely and finely as the elytra. 
This species is excessively rare; I am indebted to Dr. J. Sahlberg of Helsingfors 
for the only individual I have seen. Its structure appears very similar to that of 
Dytiscus geminus and its allies ; my specimen is probably a male, for the four front 
tarsi are rather broad. 
Scandinavia, among marine Conferve. 71. 
275. Bidessus leeticulus, n. sp.—Oblongo-ovalis, nitidus, fere levis, rufo-testaceus, 
subtus lateribus infuscatis ; elytris signaturis fuscis, punctis impressis distantibus, 
subtilibus sed distinctis ; coxis posterioribus parcissime subtiliter punctatis. Long. 
Hy lee, Il saa pian, 
The thorax is almost impunctate. The markings on the elytra are a dark 
transverse angulated one at thefextreme base, a dark common line on the suture, a 
longitudinal line outside the sutural one and which is at its hind part thickened 
externally, a smaller dark mark near the outer margin, and a mark near the 
humeral angle connecting the basal mark with the others. The species much re- 
sembles Hydroporus japonicus, (No. 286), but is readily distinguished by the 
abbreviated impressions of the elytra and thorax. I see no sexual differences. 
Siam, (Bangkok) : Celebes, (Macassar, Jan. 1874, Beccari). 72. 
