On Aquatic Carnivorous CoJeoptcra or Dytisddo'. 261 



5. Notomicrus suturalis, n. sp.— Oralis, angustulus, pernitidus, Itevigatus, livide 

 testaceus, pectore abdominisque basifiiscis; elytris serie suturali punctorum sub- 

 obsoleta ; tarsis posterioribus filiformibns, tibiis longioiibus. Long. If, lat I. m.tn. 



This insect is very lilje the preceding one but has an indistinct series of puncture>s 

 along the suture of the elytra. 



Australia, (Rockliamptoii). 469. 



6. Notomicrus brevicornis, n. sp. — Ovalis, subdepressus, pernitidus, Isevigatus 

 impunctatus, capite, elytrorum basi, pectore abdomineque obscurioribus ; tarsis 

 posterioribus debilibus. Long, ll, lat. f m.m. 



I have seen only five individuals of this minute insect, and see no sexual differ- 

 ences among them ; it is the smallest of the Dytiscidre, and is indeed amono-st the 

 most minute of the Coleoptera as it attains only the size of the larger Trichoptery- 

 gidse. 



Brazil, (Boa Sorta, No\t. 1850, Dr. Sahlbei-g). 470. 



7. Notomicrus traili, n.sp. — Ovalis, angustulus, subdepressus, pernitidus, testaceus, 

 elytris proesertim ad basin obscurioribus, capite pectoreque fuscis ; anterius 

 Icevigatus, elytris apicem versus dense, omnium subtilissime, vix perspicue punctu- 

 latis; tarsis posterioribus elougatis, filiformibus. Long, li m.m., lat. f m.m. 



This species resembles extremely Notomicrus Itevigatus (No. 4) in size, form, and 

 appearance, but it is readily distinguished from it by the fact that the apical half 

 of the elytra is covered by a close excessively fine punctuation, instead of being 

 polished and shining. The antennte are rather elongate and slender. I have seen 

 but two individuals, they have the anterior tarsi quite slender, but I can form 

 no opinion as to their sex. 



South America, (Rio Tapajog, above Itaituba, 13. 3. 1874, Dr. Trail). 1109. 



L 3.— Genus IIYDROCOPTUS. 



Anterior tibise destitute of a curved spur, with sharply defined, rectangular, outer 

 apical angle ; posterior coxal cavities very distinctly sepai'ated, coxal notch broad. 

 The five species* occur in the tropics of the Old World. 



8. Hydrocoptus subfasciatus, n. sp. — Oblongo-ovalis, transversim sat convexus, 

 subnitidus, testaceus, elytris fusco-testaceis, fascia subbasali interrupta maculaquf 



* In addition to these the following also belongs to the genus, viz : — Hydrocoptus rufulus, Motsch. 

 (No. 1,334, huj. op.); very possibly identical with No. 9 ; Burmah. 



ana 



