626 On Aquatic Carnivorous Coleoptera or Dytiscide. 
allied to the preceding, it is larger, broader, and less parallel, has the thorax largely 
pale above, and presents slight differences in nearly all respects ; the male tarsi are 
slightly broader than in C. paykulli, and the pubescence on the heel of the basal 
joint forms a comparatively small patch, and is quite different in character from the 
glandular pubescence beyond it. 
North America, (Saskatchewan). 910. 
964. Colymbetesstrigatus, Lec., Cymatopterusstrigatus, M.C.—Ovalis, latiusculus, 
convexus, subtus niger, prosterni coxarumque posticarum processubus et segmen- 
torum ventralium marginibus posterioribusrufescentibus,supracapite anteriustestaceo, 
posterius nigro, rufo-bimaculato, prothorace testaceo, vitta discoidali nigra, elytris 
fusco-testaceis, marginibus anguste testaceis, antennis fusco-testaceis, basi testaceo, 
pedibus rufis, femoribus medio infuscatis ; prothorace parum vermiculato, elytris 
strigis transversis profundis, remotis. Long. 172, lat. 9 m.m. 
This species is similar in size to Colymbetes paykulli, but is broader in front. I 
have seen only the male ; it has the three basal joints of the front tarsi broadly 
dilated, and but little compressed, and furnished beneath with only three series of 
large round palettes, the basal series being replaced by a band of glandular pubes- 
cence, the large basal portion of the tarsus is bare, except for two longitudinal 
series of asperities ; the middle tarsi are similar to the front ones, but are a little 
more compressed and not quite so broad, their clothing is also almost similar to that 
of the front feet, but instead of two longitudinal series of asperities on the basal 
portion there is one patch placed not on the middle but quite at the inner edge of 
the heel. 
North America, (California), 911. 
965. Colymbetes crotchi, n. sp.—Ovalis, haud latus, convexus, subtus niger, 
prosterni coxarumque posticarum processubus et segmentorum ventralium margini- 
bus posterioribus rufescentibus, supra capite nigro anterius testaceo, medio rufo- 
bimaculato, prothorace testaceo, vitta discoidali nigra, elytris fuscis, pedibus rufis, 
femoribus medio fuscis; prothorace parum vermiculato, elytris strigis transversis pro- 
fundis remotis. Long. 17, lat. 83 m.m. 
I have seen but a single individual, it is a male, and has the tarsi similar to those 
of the preceeding species but not so broad. 
Although undoubtedly very closely allied to the preceding, this seems to me a 
distinct species by its narrower form, as well as by minor peculiarities; the second 
ventral suture seems to be more distorted and its file better developed than in the 
larger species. This specimen is just similar in size and appearance to the smallest 
male of the European Dytiscus striatus (No, 972), from which it differs however not 
