356 On Aquatic Carnivorous Coleoptera or Dytiscide. 
279. Bidessus striola, n. sp.—Oblongo-ovalis, subopacus, testaceus, sutura 
elytrorum, pectore abdomineque infuscatis ; erebre obsolete punctatus, subtus fere 
impunctatus. Long. 23, lat. 1$ m.m. 
Var. Elytris fascia basali maculaque magna communi nigricautibus. 
The head is impunctate, and the thorax has only a few very indistinct 
punctures ; the punctures on the elytra are close, but very indistinct; the striola at 
the base of the elytra is fine and very short, bemg rather shorter than that of the 
thorax, the thoracic striola itself is short, reaching not quite half way to the front. 
The coxz are almost impunctate. 
In the male the front and middle tarsi are a little broader than in the female. 
Celebes, (Wallace). The variety with a pattern on the elytra found at Macassar, January 1874, by 
Beccari. 79. 
280. Hydroporus basalis, MacLeay, Tr. N. S. W. 1871, p. 124.—Oblongo-ovalis, 
brevis, nitidus, capite, thorace, antennis pedibusque testaceis, thoracis basi medio 
fuseo, elytris longitudinaliter fusco-signatis, crebre obsoletissime punctatis ; 
abdomine pectoreque fuscis. Long. 14, lat 1 m.m. 
This species is rather similar to Hydroporus confusus, (No. 270), but is a good 
deal smaller. I have no doubt that I have the sexes before me, but they show 
very slight distinctions. 
Australia, (Gayndah, Rockhampton). 91. 
281. Bidessus signatus, n. sp.—Oblongo-ovalis, rufo-testaceus, nitidus, elytris 
sparsim subtiliter punctatis, thoracis basi medio, pectore abdomineque nigricantibus, 
elytris sutura lineisque duabus longitudinalibus (interna extus hamata, externa 
abbreviata) nigris. Long. 23, lat. 14 m.m. 
This species is very closely allied to Hydroporus thermalis, (No. 272), but is 
rather larger, and has the elytra more sparingly punctured. I have seen but two 
specimens which are I think males, though they have the four front tarsi slender. 
Australia, (Brisbane). 92. 
282. Bidessus godeffroyi, (Wehncke), n. sp.—Oblongo-ovalis, subopacus, testaceus, 
thoracis basi medio elytrisque fuscis, his basi lateribus apiceque testaceo-maculatis, 
dense obsoleteque punctatis, subtiliter distincteque pubescentibus. Long. 2, lat. 
17 m.m. 
Though I have examined several specimens, I see no sexual distinctions. 
Australia, (Gayndah, Rockhampton, Melbourne). 93. 
