On Aquatic Carnivorous Coleoptera or Di/tiscidce. 539 



The male has the front and middle tarsi a little incrassate, and furnished beneath 

 with rather long hairs which bear very minute palettes ; there is no trace of oblique 

 striae on the ajiical ventral segment. There is no difference in the sculpture of the 

 sexes. 



Australia. 816. 



760. Agabus reticulosus, Clk., M.C — Ovalis, minus brevis, sat convexus, sub- 

 opacus, fusco-niger, antonnis pedibusque rufis, capite anterius prothoraceque lateribus 

 vage rufescentibus, elytris pone medium vitta sublaterali, indeterminata, plus 

 minusve elongata, testacea ; supra densius reticulatus ; pvothorace cum elytris 

 continuo, angulis posterioribus baud acutis ; prosterni processu angusto. Long. 

 7, lat. 4 m.m. 



The male has the front and middle tarsi distinctly incrassate and furnished 

 beneath with rather long hairs which bear small palettes ; there seems to be a 

 slight sexual difference in the sculpture of the upper surface, the female having 

 the reticulations on the basal portion of the elytra rather denser, and the meshes 

 narrower. 



The few specimens I have seen are immature and soft ; in them the under surface 

 has the ventral segments somewhat more rufescent than the breast ; the colour on 

 the upper surface is very ill-defined, there is a vague rufescent area near the 

 shoulders of the elytra, with Avhich the sublateral mark tends to be connected. 

 The serial punctures of the elytra are excessively obsolete. 



Australia. 817. 



761. Platynectes limbatus, n. sp. — (cj). Uvalis, sat convexus, fere angustus, sub- 

 nitidus, fusco-niger, antennis pedibusque rufis, capite anterius et prothorace lateribus 

 anguste, elytris lateribus late, rufescentibus ; supra densius subtiliusque reticulatus ; 

 prothorace cum elytris continuo, angulis posterioribus haud acutis ; prosterni pro- 

 cessu angusto. Long. 7, lat. vix 4 m.m. 



The only individual I have seen is a female, and though very similar to Agabus 

 reticulosus, indicates an undoubtedly distinct species, the size is smaller, the form 

 narrower, the upper surface less dull, the outer portion of the elytra more broadly 

 reddish, the serial punctures of the elytra less obsolete, and the coxal lines rather 

 more widely separated. 



Australia. 818. 



762. Platynectes obscurus, n. sp. — Ovalis, fere angustus, sub-convexus, nitidus, 

 niger supra aenescens, elytris vittula sublaterali pone medium testacea, antennis 

 pedibusque rufis ; supra crebrius subtiliter reticulatus ; thorace cum elytris omnino 



TRANS. BOT. DUB. SOC, N.3., VOL. II. 4 A 



