On Aquatic. Carniworous Coleoptera or Dytiscide. 651 
1008. Hydaticus cinctipennis, Aube, M.C.—Ovalis, elongatus, subtus nigro- 
piceus, capite prosternoque rufescentibus, supra capite thoraceque rufis, hoc basi in 
medio indiscrete infuscato, elytris piceis, vitta humerali longitudinali elongata, 
paulo obliqua antice marginem attingente lateribusque parum discrete rufescentibus, 
antennis pedibusque anterioribus rufis ; pedibus posterioribus picescentibus, ungui- 
culo interno quam externo duplo longiore. Long. 135, lat. 7; m.m. 
I have seen only a single individual of this species, it is a male in very mutilated 
condition, the middle tarsi are broadly dilated, but their basal patch of dense rough 
pubescence is rather small though quite distinct. 
Though rather similar to H. modestus, the species is readily distinguished from 
it by the less variegate colour of the upper surface. 
North America. 1036. 
1009. Hydaticus americanus, 2. sp.—Oblongo-ovalis, parum latus, subtus nigro- 
piceus, prosterno capiteque in medio testaceis, supra capite thoraceque rufo-testaceis, 
illo in vertice nigro rufo-bimaculato, hoc basi in medio nigro, elytris vittis longi- 
tudinalibus nigris, a vittis flavis fere integris divisis, margine laterali fasciaque lata 
transversa basali flavis, antennis pedibusque quatuor anterioribus rufis, tibiis 
intermediis rufo-piceis ; pedibus posterioribus piceis, unguiculo interno quam externo 
duplo longiore. Long. 132, lat. 74 m.m. 
The female of this species has the elytrai apices distinctly produced, and sinuate, 
but it is without any sexual sculpture on the thorax or elytra. The male is unknown 
to me. 
This species is very closely allied to Dytiscus stagnalis (No. 1011), and is about 
as long, but is narrower and of more parallel form, and the yellow lines and fascia 
of the elytra are a little more distinct and definite, the female has the apices of the 
elytra produced and no sexual sculpture. 
North America, (Red River). 1035. 
1010. Hydaticus leevipennis, Thoms., Op. Ent. III, p. 324.—Ovalis, parum latus, 
subtus nigro-piceus, prosterno capiteque in medio testaceis, supra capite thoraceque 
rufo-testaceis, illo in vertice nigro rufo-bimaculato, hoc basi in medio nigro, elytris 
nigris fascia sub-basali transversa parum disereta, margine laterali limeisque 
tenuibus longitudinalibus obsoletis, testaceis ; antennis pedibusque quatuor anteri- 
oribus rufis, tibiis intermediis rufo-piceis ; pedibus posterioribus piceis, unguiculo 
interno quam externo haud duplo longiore. Long. 122, lat 7 m.m. 
The female of this species has the apices of the elytra at the suture a little 
produced so as to give rise to a conspicuous sub-apical sinuation ; it has impressions 
on the thorax and elytra as in the corresponding sex of Dytiscus stagnalis. The 
male is unknown to, me. 
TRANS. ROY. DUB. SOC., N.S., VOL, IL. 4P 
