516 On Aquatic Carnivorous Coleoptera or Dytiscide. 
palettes ; the claws of the anterior feet are not elongate, and the front one has 
the basal half or more a good deal thicker beneath than the apical portion. The 
females vary much in sculpture, sometimes they are as smooth and shining above 
as the males, while in the other extreme the surface is quite opaque from a very 
dense and fine reticulation ; forms intermediate between these extremes are to be 
found, and it is worth notice that these variations of the female are probably to a 
great extent localised. In A. godmanni, Crotch, from the Azores, the sculpture of 
the surface in the female has become excessively deep so that the surface is very 
opaque and rugose; and the male has the front and middle tarsi with the basal 
joints more incrassate, but I cannot consider the form as a distinct species, for in 
the two males I have seen the claws of the front tarsi are considerably different, 
in one they are formed as usual in the species, while in the other they are more 
elongate and have a small tooth near the base; of the female I have seen but one 
individual so do not know whether it varies: it appears to me then that this will 
prove to be merely a variety, because there is nothing to distinguish it from 
Continental specimens except certain sexual disparities and these it seems are 
variable. 
Europe, Corsica, Algeria, Trans-Caucasus, Mesopotamia, Azores; (Denmark, Scotland, England, 
France, Germany, Spain). 751. 
715. Agabus austinil, (Crotch), n. sp.—Ovalis, sat convexus, nitidus, subtus 
capite prosternoque rufis, hoe medio pectore abdomineque nigricantibus, hoe 
plus minus rufo-variegato, supra fuscus, capite anterius et prothoracis elytro- 
rumque lateribus rufis, antennis pedibusque rufo-testaceis; supra undique evidenter 
reticulatus, reticulis magnis. Long. 93, lat. 5 m.m. 
The male has the front and middle tarsi distinctly incrassate, and furnished 
beneath, on a rather narrow space, with moderately long glandular hairs ; the claws 
of the front feet are elongate and nearly straight, and have a swelling at the 
extreme base, there is no difference in the sculpture of the sexes. 
North America, (British Columbia). 792. 
716. Dytiscus striolatus, Gyll., Agabus striolatus, M.C._—Oblongo-ovalis, elongatus, 
angustulus, minus nitidus, niger, antennis pedibusque rufis; supra undique evidentius 
reticulatus, retis in elytris elongatis ; prothorace angulis posterioribus obtusiusculis. 
Long. 7, lat. 4 m.m. 
The male has the three basal joints of the front and middle tarsi a little incrassate, 
and furnished beneath with moderately long glandular hairs, the claws of the front 
feet are rather long, and are simple. In other respects the sexes are quite similar. 
Northern Europe ; a rare species, (Sweden, Finland, England, the Rhine province ; basin of the Seine). 
760. 
