546 On Aquatic Carnivorous Coleoptera or Diitiscirloe. 



I. 49.— Genus LEURONECTES. 



Side of prothorax without raised marcfin ; coxal lines present. 



The genus comprises only two^' dissimilar species found in South America. 



772. Iieuronectesparallclus,n.sp. — Oblongus,parallelus, subdepresus, nitidissimus, 

 niger, antennis pedibusque rufis, supra subtiliter haud dense reticulatus ; 

 prothorace immarginato, punctis magnis ad marlines parallelis ; elytris punctis 

 subseiiatis conspicuis ; prosterni processu sat lato, apice acuminato ; tarsis 

 posterioribus gracilibus. Long. 7, lat. 3i m.m. 



The male has only a slight thickening of the front and middle tarsi, and their 

 three basal joints furnished beneath with very short pubescence ; the apical ventral 

 segment is without stritB. The female I have not seen. 



This species has the form of our European Dytiscus striolatus (No. 716). 



South America, (Columbia). 821. 



773. Colymbetes gaudichaudi, Lap., Agabus gaudichaudi, M.C. — Ovalis, latius- 

 culus, subdepressus, densius subtiliter reticulatus, subnitidus, niger, antennis 

 pedibusque rufis, prothorace ad angulos anteriores }ucescente, elytris macula incon- 

 spicua, sublaterali pone medium testacea ; prothorace punctis marginalibus 

 subobsoletis, elytris punctis subseriatis sat conspicuis ; prothorace immarginato ; 

 prosterni processu j^lano, acuminato ; lineis coxalibus subtil ibus. Long. 8i, lat. 

 4| m.m. 



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

 incrassate, and rather amply furnished beneath with moderately short glandular 

 hairs, and the apical ventral segment is finely and longitudinally strigose. There is an 

 extremely slight sexual difference in the sculpture of the elytra, this being slightly 

 denser in the female. 



Though allied structurally to Leuroneotes parallelus this species is extremely 

 distinct therefrom by its broad form, and more closely and distinctly sculptured, 

 less shining, upper suface ; the hind legs are rather well developed for swimming. 



South America, (Chili). 822. 



*A thii-d species, unknown to me, shoiild probably be referred to the genus, viz., Agabus mulleri, Kirsch. 

 (No. 1198 huj. op.) ; Bogota. 



