On Aquatic Carnivorous Coleoptera or Dytiscide. 283 
83. Macrovatellus lateralis, n. sp.—Oblongo-ovalis, fere sine pubescentia, opacus, 
densius punctatus, fuscus, pedibus antennisque lete rufo-testaceis, capite, thoracis 
lateribus, elytrorumque signaturis marginalibus ferrugineis; thorace  elytris 
angustiore, lateribus haud sinuatis, angulis posterioribus fere rectis, fortiter et crebrius 
sed haud profunde punctato ; elytris punctatis, scabriusculis; coxis posterioribus for- 
titer, sed subobsolete punctatis, abdomine obsolete punctato. Long. 63, lat. 33 m.m. 
The male has the front and middle tarsi broader than the female, the second 
joint of the front ones being scarcely so long as its greatest width; the middle 
trochanters and the basal portion of the femora are set with a ridge of dense yellow 
pubescence. In the female when the sole of the front tarsus is looked at, it is seen 
that the length of the third joint is quite twice as great as its breadth. 
South America, (Uruguay). 438. 
84. Macrovatellus rudis, n. sp.—Oblongo-ovalis, fere sine pubescentia, opacus, 
densius punctatus, piceus, pedibus antennisque obscure rufis, capite ferrugineo, 
prothorace elytrisque lateribus vage et obsolete ferrugineo-signatis ; thorace elytris 
multo angustiore, lateribus haud sinuatis, angulis posterioribus fere rectis, fortiter 
et crebrius sed haud profunde punctato ; elytris dense punctatis, scabriusculis ; coxis 
posterioribus fortiter, sed subobsolete punctatis; abdomine obsolete punctato. 
Long. 63, lat. 32 m.m. 
This species is distinguished from Macrovatellus lateralis only by the rather more 
obscure colour, slightly broader elytra, and by the joints of the front and middle 
tarsi being just a little broader in proportion to their length: the distinctions 
between their structure in the two sexes being the same as in M. lateralis. 
South America. 439. 
85. Macrovatellus sahlbergi, n. sp.— ¢ Oblongo-ovalis, fere sine pubeseentia, dense 
fortiter profundeque punctatus, piceus, capite antennisque minus dilute ferrugineis, 
elytris ad latera signaturis minus distinctis rufescentibus; prothorace fortiter 
transverso, pone medium leviter angustato, ante basin evidenter transversim depresso, 
lateribus obsolete explanatis, opaco, crebre punctato ; elytris subnitidis, dense fortiter 
profundeque punctatis ; coxis posterioribus ruguloso-punctatis, abdomine indistincte 
punctato. Long. 63, lat. 33 m. 
In the male the front and middle tarsi are moderately broad, the third joint 
however being of the same width as the basal joint ; the trochanters and the basal 
portion of the femora of the middle legs bear a ridge of dense yellow pubescence. 
The species resembles M. rudis greatly, but is readily distinguished by its broader 
and more transverse thorax, and the more shining, and more coarsely and distinctly 
punctured elytra. I have seen two males. 
South America. Found at Petropolis in March, 1850, by Dr. F. Sahlberg, and sent me by his son, 
Dr. J. Sahlberg. 440. 
TRANS. ROY. DUB. SOC., N.S., VOL, I. 2P 
