616 On Aquatic Carnivorous Coleoptera or Dytiscide. 
quite small palettes, the claws are rather long and slender and nearly equal and 
simple, the anterior one of each pair being notched beneath close to the base. 
Mexico. 887. 
940. Colymbetes nitidus, Brullé, M.C.—Ovalis, robustus, latus, convexus, nitidus, 
niger, supra vix subzenescens, vertice rufo-bimaculato, prothoracis elytrorumque lat- 
eribus plus minusve late ferrugineis, his in parte ferruginea plus minusve discrete 
nigro-irroratis ; antennis palpisque rufis, pedibus piceis ; corpore supra subtilissime 
punctulato, haud reticulato ; abdomine basi subtiliter strigosulo, strigiculis utrinque 
ad marginem posteriorem versus medium segmenti secundi magis confertis; tarsis 
posterioribus robustis, articulis extus inferne breviter lobato-productis, unguiculo 
interno quam externo duplo longiore. Long. 133, lat. 73 m.m. 
The male has the basal joints of the front and middle tarsi moderately mcrassate 
and compressed, and furnished beneath with four series of quite small palettes, 
with the marginal hairs but little developed ; the claws of the front feet are short 
and equal, the middle claws are also equal but are a good deal longer than those of 
the front feet; the apical ventral segment is obliquely strigose on each side in this 
SeX. 
South America, (Chili). 888. 
941. Colymbetes limbatus, Aubé, M.C.--Gvalis, convexus, latus, niger, supra vix 
subzenescens, capite antice et in vertice, prothoracis elytrorumque lateribus, antennis 
pedibusque anterioribus ferrugineis, pedibus posterioribus piceis ; corpore supra sub- 
tilissime punctulato, haud reticulato ; prosterno anterius in medio valde compresso- 
elevato ; tarsis posterioribus brevibus robustis, articulis extus inferne breviter lobato- 
productis, unguiculis crassis, interno quam externo duplo longiore. Long. 14, lat. 
8 m.m. 
I have seen only a single individual of this species, it is a female ; the same 
individual that served Aubé for his description. It seems to be really allied to 
Colymbetes nitidus, but is of broader form, more narrowed in front, the prosternum 
is more acutely elevated in the middle, there is no abdominal file, the hind legs, 
especially the tarsi, are shorter and thicker, and the epipleurze behind the middle 
are considerably broader. 
Brazil, (coll. Mnizech). 1164. 
942. Dytiscus calidus, Fab., Colymbetes calidus, M.C_— Ovalis, sat convexus, fere 
leevigatus, niger, capite anterius verticeque minus discrete rufescentibus, prothoracis 
lateribus elytrisque ferrugineis, his confertim nigro-irreratis, versus basin sepe 
omnino nigris, in irrorationes lineis pallidis plus minusve distinctis fasciaque basali 
