516 On Aquatic Carnivorous Coleoptera or Dytiscidce. 



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 

 foimd, and it is worth notice that these variations of the female are probably to a 

 great extent locaUsed. 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 wiU 

 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, Meso])otamia, Azores; (Denmark, Scotland, England, 

 France, Germany, Spain). 751. 



715. Agabus austinii, (Crotch), n. sp. — Ovalis, sat convexus, nitidus, subtus 

 capite prosternoque rufis, hoc medio pectore abdomineque nigricantibus, hoc 

 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. 9i, 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 ; tlie claws 

 of the front feet are elongate and nearly straight, and have a swelling at the 

 extreme base, there is no difierence in the sculpture of the sexes. 



North America, (British Columbia). 792. 



716.1 )y tiscus 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 Eui-ope ; a i-are species, (Sweden, Finland, England, the Rhine province ; basin of the Seine). 

 760. 



