On Aquatic Carnivorous Coleoptera or DytiscidcB. SIT' 



71 7. Agabus (Gaurodytes) strigulosus, Crotch, Tr. Am. Ent. Soc. IV, p. 422. — 

 Oblongo-ovalis, angustuliis, niger, supra fuscescens, prothorace elytrorumque lateribus 

 vage testaceis, antennis pedibusque rufis ; supra ubique evidenter reticulatus. Long. 

 6, lat. 3 m.m. 



In this species, the reticulation of the upper surface though fine is quite distinct, 

 and forms large meshes, which are as conspicuous on the head and tlaorax as on 

 the elytra. The male has the three basal joints of the front and middle tarsi 

 distinctly incrassate, and furnished beneath with short hairs which bear distinct 

 palettes. The female I have not seen. 



The prosternal process in this species is moderately compressed, and is much 

 punctulate : by the form and sculpture a relationship with Dytiscus striolatus is 

 suggested, but the male tarsi are differently clothed, and the supra-articular border 

 is quite ordinary. 



North America, (California). 748. 



Group 11. 



Outline of thorax and elytra discontinuous, male front tarsi slender, but with 

 long claws j prosternal process rather small, nearly Hat, very finely margined, feebly 

 punctate ; metasternal groove imperfect ; swimming legs elongate, slender, and 

 feeble ; hind coxse rather small, but wings of metasternum not large. 



Two Old World (Siberian) species. 



718. Agabus sahlbergi, n. sp. — (? Oblongo-ovalis, niger, nitidus, antennis palpis 

 pedibusque rufis ; prothorace lateribus leviter rotundatis, basi utrinque subrotundato, 

 angulis posterioribus obtusiusculis, margine laterali crasso ; elytris nitidis subtihus 

 reticulatis, versus apicem nitidis baud rugosis. Long. 7i, lat. 4i m.m. 



This species is shorter than Agabus armeniacus (No. 671), and has the base of 

 the thorax a little more curved and the hind angles more obtuse, and the reticulation 

 of the elytra is not quite so distinct. The difference in the sculpture of the elytra, 

 and the shape of the hind angles of the thorax distinguish it from Dytiscus guttatus 

 (No. 670), to which it is closely allied. 



I have seen but a single individual, which is a male, and has the three basal 

 joints of the front and middle tarsi a little incrassate and furnished beneath with 

 short hairs ; the claws of the front feet are elongate and slender, and a little sinuate, 

 especially the anterior one. 



3X2 



