546 On Aquatic Carnivorous Coleoptera or Dytiscide. 
I. 49.—Genus LHURONECTES. 
Side of prothorax without raised margin ; coxal lines present. 
The genus comprises only two* dissimilar species found in South America. 
772. Leuronectes parallelus, n. sp.—Obloneus, parallelus, subdepresus, nitidissimus, 
niger, antennis pedibusque rufis, supra subtiliter haud dense reticulatus ; 
prothorace immarginato, punctis magnis ad margines parallelis; elytris punctis 
subseriatis conspicuis; prosterni processu sat lato, apice acuminato; tarsis 
posterioribus gracilibus. Long. 7, lat. 32 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 striz. The female [ 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 picescente, elytris macula incon- 
spicua, sublaterali pone medium testacea; prothorace punctis marginalibus 
subobsoletis, elytris punctis subseriatis sat conspicuis; prothorace immarginato ; 
prosterni processu plano, acuminato; lineis coxalibus subtilibus. Long. 84, lat. 
47 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 finelyand 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 Leuronectes 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 third species, unknown to me, should probably be referred to the genus, viz., Agabus mulleri, Kirsch. 
(No. 1198 huj. op.) ; Bogota. 
