•25 4 On Aquatic Cavaivorous Coleoplera or Dijtlsddce. 



8G. Macrovatellusmarginalis,n.s}). — ? Oblongo-ovalis,fere sinepubescentia,densius 

 punctatus, opacus, piceus, antennis pedibusque rufis,capite ferrugineo,elytris adlatera 

 rufo-signatis ; prothorace quam his luulto angustiore, lateribus subsinuatis, angulis 

 posterioribus acute rectis, anto basin sat distincte depresso, crebre punctato ; elytris 

 dense minus argute punctatis, scabriusculis; corpore subtus obsolete punctato. Long. 

 Q\, lat. Zl 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. Salilberg. 441. 



87. Macrovatellus mesicanus, n. sp. — i Oblongo-ovalis, fere sine pubescentia, 

 d.ensius punctatus, opacus, piccus, antennis pedibusque minus Ifete 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, 

 cr.ebre obsolete punctato ; elytris dense punctatis, scabriusculis ; coxis posterioribus, 

 subobsolete ruguloso-punctatis ; abdomine crebrius subtiliter scabro. Long. 5j, 

 lat. y 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 sliort 

 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 transverse, 

 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. 2i 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 



