Oil Aquatic Carnivorous Coleoi^tera or Dytiscidoe. 617 



variabili, antennis pedibusque anterioribus rufis, pedibus posterioribus piceis, crassis, 

 tarsorum articulis lobato-productis, unguiculo interno quam externo crassiusculo 

 plus duplo longiore. Long. I2i, lat. 6i m.m. 



The male has the front and middle tarsi only very slightly incrassate and entirely 

 compressed, and furnished beneath with minute palettes, their claws are nearly 

 equal and simple. The species varies a good deal in size and in the colouring of 

 the upper surface, but very little in other respects. 



America, from Brazil to the United States of North America, (Rio de Janeiro, Amazons, Venezuela,. 

 Peni, Guatemala, Mexico, Texas). 889. 



943. Dytiscus grapii, Gyll., Colyinbetes grapii, M.C. — Ovalis, parum convexus^ 

 niger, subopacus, antennis palpisque testaceis, pedibus, prothoracis lateribus elytro- 

 rumque epipleuris piceis, supra creberrime subtilissimeque reticulatus ; prothorace 

 basi utrinque profunde sinuato, angulis po.sterioribus prolongatis; prosterno medio 

 anterius parum elevato ; tarsis posterioribus articulis extus inferne bene lobatis, 

 unguiculo interno quam externo duplo longiore. Long. 11, lat. 5f m.m. 



The male has the front and middle tarsi a good deal incrassate but quite com- 

 pressed, and furnished beneath with four rows of small palettes, the marginal hairs 

 are moderately long; on the front feet the basal portion of the tarsus beneath is 

 quite bare and shining, and the claws are moderately long and nearly equal and 

 simple ; on the middle feet the basal portion of the tarsus beneath is occupied by a 

 large patch of dense glandular pubescence, and the claws are thick, the outer one 

 especially being much incrassate beneath, and quite distinctly longer than the 

 inner one. 



Europe, (Sweden, Finland, Lapland, England, France, Germany ; Oonstantine, Algeria, teste Bedel). 

 890. 



944. Colymbetes sinuatus, Lee, Proc. Ac. Phil. 1866, p. 522. — Ovalis, parum 

 convexus, niger, subopacus, antennis palpisque testaceis, prothoracis lateribuij 

 elytrorumque epipleuris piceis, supra creberrime subtilissimeque reticulatus; pro- 

 thorace basi utrinque profunde sinuato, angulis posterioribus prolongatis ; prosterno- 

 medio anterius parum elevato ; tarsis posterioribus articulis extus inferne bene 

 lobatis, unguiculo interno quam externo plus duplo longiore. Long. 10, lat. 5 

 m.m. 



Extremely closely allied to the preceding, but much smaller. 



North America, (Dacotah, Illinois). 895. 



945. Dytiscus pustulatus, Rossi, Scutopterus pustulatus, M.C. — Ovalis, convexus, 

 nigricans, vix supra subsenescens, limbo piceo, antennis palpisque rufis, pedibus 



