6l6 0« Aquatic Carnivorous Coleoptera or Dytiscidce. 



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, Brulle, M.C. — Ovalis, robustus, latus, convexus, nitidus, 

 niger, supra vix subsenescens, 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 ; corpora supra subtilissime 

 punctulato, haud reticulato ; abdomine basi subtiliter strigosulo, strigiculis utrinque 

 ad niarginem jjo.sterioi'ern versus medium segmenti secundi magis confertis ; tarsis 

 posterioribus robustis, articulis extus inferne breviter lobato-productis, unguiculo 

 interno quam externo duplo longiore. Long. ISi, lat. 7^ m.m. 



The male has the basal joints of the front and middle tarsi moderately incrassate 

 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 Ainorica, (Chili). 888. 



941. Colymbetes limbatus, Aub^, M.C. — Ovalis, convexus, latus, niger, supra vix 

 subaenescens, capita 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 Aube for his description. It seems to be really allied to 

 Colymbetes nitidus, but is of broader form, more narrowed in front, the presternum 

 is more acutely elevated in the middle, there is no abdominal file, the hind legs, 

 especially the tarsi, are shorter and thicker, and the epipleuraj behind the middle 

 are considerably broader. 



Brazil, (coll. Mnizech). liGi. 



942. Dytiscus calidus. Fab., Colymbetes calidus, M.C. — Ovalis, sat convexus, fere 

 laivigatus, niger, capite anterius verticeque minus discrete rufescentibus, prothoracis 

 lateribus elytrisque ferrugineis, his confertim nioro-irroratis, versus basin ssepe 

 oranino nigris, in irrorationes lineis pallidis plus minusve distinctis fasciaque basali 



