356 On Aquatic Carnivorous Coleojjtera or Dyliscidae. 



279. Bidessus striola, n. ,sp. — Oblongo-ovalis, subopacus, testaceus, sutura 

 elytrorum, pectorp. abdomineque infuscatis ; crebre obsolete punctatus, subtus fere 

 iinpunctatus. Long. 23, lat. Ij m.m. 



Var. Elytris fascia basali maculaque magna communi nigricatitibus. 



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, being rather shorter than that of the 

 thorax, the thoracic striola itself is short, reaching not quite half way to the front. 

 The coxse 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 

 fusco, elytris longitudinaliter fusco-signatis, crebre obsoletissime punctatis ; 

 abdomine pectoreque fuscis. Long, if, 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. 21^, lat. li 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. 

 \\ m.m. 



Though I have examined several specimens, I see no sexual distinctions. 



Australia, (Gayndah, Rockhampton, Melbourne). 93. 



