626 On Aquatic Carnivorous Coleoptera or Dytiscklce. 



allied to the preceding, it is larger, broader, and less parallel, has the thorax largely 

 pale above, and presents slight ditFerences in nearly all respects ; the male tarsi are 

 slightly broader than in C. paykuUi, and the pubescence on the heel of the basal 

 joint forms a comparatively ?mall patch, and is quite different in character from the 

 glandular pubescence beyond it. 



North America, (Saskatchewan). 910. 



964. Colymbetesstrigatus,Lec., Cymatopierusstrigatus, M.C — Ovalis, latiusculus, 

 convexus, subtus niger, prosterni coxarumque posticarum processubus et segmen- 

 torumventraliummarginibusposterioribusrufescentibuSjSupracapiteanteriuatestaceo, 

 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. I7g, 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, hand 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. S§ 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 ju?t similar in size and appearance to the smallest 

 male of the European Dytiscus striatus (No, 972), from which it difters however not 



