On Aquatic Carnivorous Coleoptera or Dytiscide. 261 
5. Notomicrus suturalis, n. sp.—Ovalis, angustulus, pernitidus, leevigatus, livide 
testaceus, pectore abdominisque basi fuscis; elytris serie suturati punctorum sub- 
obsoleta ; tarsis posterioribus filiformibus, tibiis longioribus. Long. 1s, lat. m.m. 
This insect is very like the preceding one but has an indistinct series of punctures 
along the suture of the elytra. 
Australia, (Rockhampton). 469. 
6. Notomicrus brevicornis, n. sp—Ovalis, subdepressus, pernitidus, levigatus 
impunctatus, capite, elytrorum basi, pectore abdomineque obscurioribus ; tarsis 
posterioribus debilibus. Long. 1s, lat. ¢ 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 Dytiscide, and is indeed amongst the 
most minute of the Coleoptera as it attains only the size of the larger Trichoptery- 
idee. . 
Brazil, (Boa Sorta, Novr. 1850, Dr. Sahlberg). 470. 
7. Notomicrus traili, n.sp.—Ovalis, angustulus, subdepressus, pernitidus,testaceus, 
elytris preesertim ad basin obscurioribus, capite pectoreque fuscis; anterius 
leevigatus, elytris apicem versus dense, omnium subtilissime, vix perspicue punctu- 
latis; tarsis posterioribus elongatis, filiformibus. Long. 12 m.m., lat. ¢ m.m. 
This species resembles extremely Notomicrus levigatus (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 antennz 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 Tapajos, above Itaituba, 13. 3. 1874, Dr. Trail). 1169. 
I. 3—Genus HY DROCOPTUS. 
Anterior tibize destitute of a curved spur, with sharply defined, rectangular, outer 
apical angle; posterior coxal cavities very distinctly separated, 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 maculaque 
* 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. 
3M 2 
