On Aquatic Carnworous Coleoptera or Dytiscide. 625 
The male has the upper surface shining, while in the female the elytra are very 
dull, with the apical parts shining; the sculpture of the latter sex is scarcely so 
deep as itis inthe male. The male front and middle tarsi have the whole of the 
three basal joints densely and uniformly clothed beneath with one kind of glandular 
pubescence. 
Siberia. 907. 
961. Colymbetes paykulli, kr., Cymatopterus paykulli, M.C.—Elongato-ovalis, 
convexus, niger, antennarum basi testaceo, clypeo rufo, vertice parum conspicue 
rufo-bimaculato, thorace lateribus fasciaque mediali parum discreta in medio late 
interrupta rufis, elytris marginibus rufescentibus ; corpore strigoso, strigis trans- 
versis elytrorum sat profundis. Long. 19, lat. 10 m.m. 
Each sex in this species has the elytra shining, and similariy sculptured: the 
male tarsi are hardly so broad as in the preceding species, and the pubescence of 
the basal portion of the first jot is of a distinctly different character to that 
beyond it, this distinction is greater on the middle than it is on the front feet. 
Europe ; North America,(Sweden ; Finland 68° 30’, Sahlberg; North Germany, western North America). 
908. 
962. Colymbetes longulus, Lec., Cymatopterus longulus, M.C.—Klongato-ovalis, 
angustulus, sat convexus, niger, antennarum basi testaceo, clypeo rufo, vertice rufo- 
bimaculato, prothorace lateribus testaceis, elytris fuscis, marginibus testaceis ; corpore 
strigoso, prothorace disco profundius vermiculato, strigis transversis elytrorum sat 
profundis. Long. 162, lat. 8 m.m. 
I have seen only the male of this species, the front and middle tarsi are rather 
narrow, and more compressed than in C. paykulli; the pubescence at the heel of 
the basal joint of each is of a quite different character from the glandular pubes- 
cence beyond it; the emargination of the last ventral segment is slight. 
The species cannot be considered closely allied to C. paykulh, it is smaller, 
narrower, and more parallel, less sombre in the colour of the upper surface ; with 
the sculpture of the thorax of a different character, and the male tarsi different. 
North America, (Lake Superior, Kansas). 909. 
963. Colymbetes seminiger, Lec., Cymatopterus semimiger, M.C.—Ovalis, haud 
angustulus, convexus, niger, antennarum basi testaceo, clypeo rufo, vertice rufo- 
bimaculato, prothorace testaceo, plaga transversa discoidali nigra, elytris fuscis 
marginibus testaceis ; corpore strigoso, prothorace disco vermiculato, strigis trans- 
versis elytrorum sat profundis. Long. 18, lat. 9? m.m. 
Of this species I have seen only the male; it does not appear to me very closely 
