284 On Aquatic Carnivorous Coleoptera or Dytiscide. 
86. Macrovatellusmarginalis, n. sp.—? Oblongo-ovalis, fere sine pubescentia, densius 
punctatus, opacus, piceus, antennis pedibusque rufis, capite ferrugineo, elytris adlatera 
rufo-signatis ; prothorace quam his multo angustiore, lateribus subsinuatis, angulis 
posterioribus acute rectis, ante basin sat distincte depresso, crebre punctato ; elytris 
dense minus argute punctatis, scabriusculis; corpore subtus obsolete punctato. Long. 
63, lat. 834 m.m. ; 
I have seen only two females of this species, they have the front tarsi long and 
slender, and when looked at beneath it is seen that the third joint is a little 
narrower than the first, and is more than twice as long as broad. At the side of 
the apical ventral segment there is to be seen only a narrow linear depression close 
to the edge of the elytron; this character will distinguish the species from the 
three preceding species, for in them this depression is broader and more conspicuous 
and not linear. 
South America: Santa Rita, August, 1850, Dr. F. Sahlberg. 441. 
87. Macrovatellus mexicanus, n. sp.—¢ Oblongo-ovalis, fere sine pubescentia, 
densius punctatus, opacus, piceus, antennis pedibusque minus lete rufis, capite rufo, 
elytris ad latera obsolete rufo-signatis ; prothorace brevi, elytris multo angustiore, 
lateribus sinuatis, angulis posterioribus acute rectis, ante basin sat distincte depresso, 
crebre obsolete punctato ; elytris dense punctatis, scabriusculis ; coxis posterioribus, 
subobsolete ruguloso-punctatis ; abdomine crebrius subtiliter scabro. Long. 53, 
lat. 3 m.m. 
The male has the front and middle tarsi moderately long and not very broad, 
and the middle trochanters and basal portions of the femora with a ridge of short 
not very conspicuous pubescence. I have seen only a single individual ; the species 
is allied to Macrovatellus marginalis, in the form of the thorax, and the linear 
impression at the side of the last ventral segment; but it is considerably smaller, 
and the roughness or punctuation of the ventral segments is much more con- 
spicuous. 
Mexico. 442. 
88. Vatellus haagi, Wehncke Stet. Zeit. 1876, p. 357.—Oblongo-ovalis, minus 
elongatus, fere opacus, fusco-rufus, elytris ad latera obsolete rufo-signatis, antennis 
pedibusque rufis; capite anterius fere impunctato ; prothorace valde transverso, 
lateribus vix sinuatis, angulis posterioribus obtuse rectis, parce punctato, ante basin 
fortius transversim depresso; elytris sat dense punctatis, scabriusculis; coxis 
posterioribus subobsolete punctatis ; abdomine obsolete punctato. Long. 5 m.m., 
lat. 23 m.m. 
This species is allied to M. marginalis, and M. mexicanus, but is considerably 
smaller, and has the prothorax shorter and more sparingly punctured. I have seen 
