622 On Aquatic Carnivorous Coleoptera or Dytiscide. 
954. Dytiscus adspersus, Fab., Rhantus aberratus, M.C.—Ovalis, latus, parum 
convexus, testaceus, pectore nigro, medio rufo, abdomine fasciis nigricantibus, vertice 
nigro-variegato, elytris nigro-irroratis. Long. 92, lat. 53 m.m. 
The male has the front tarsi a good deal incrassate, and comparatively little com- 
pressed, and furnished beneath with moderately large palettes, the marginal hairs 
are largely developed, and have beautifully curled extremities: their claws are 
moderately long, the front one a little shorter, and considerably thicker than the hinder 
one; the middle tarsi are clothed beneath in a similar manner to the front feet, their 
claws are rather short, the outer one is greatly thickened beneath, so that its lower 
edge is quite straight, with a minute, slightly deflexed apex, the inner claw is rather 
shorter and more curved. The female has a slight tendency to more coarse reticu- 
lation on the outer part of the elytra. 
This species is much smaller than Colymbetes consputus; its short, broad 
form, and the colouration of its under surface should prevent its being confounded 
with any of its allies: 1t has sometimes a fuscous mark at the extreme base of the 
thorax in the middle. 
Europe, Corsica, Sardinia, Algeria. (Sweden ; Finland 60° 20’ Sahlberg) ; England ; France ; Germany ; 
Hungary). 901. 
955. Rhantus hispanicus, n. sp.—Ovalis, latus, subdepressus, testaceus, vertice 
angustius nigro-variegato, elytris nigro-irroratis. Long. 9%, lat 55 m.m. 
The male has the front tarsi a good deal incrassate, and comparatively little com- 
pressed, and furnished beneath with rather small palettes placed on long hairs, the 
marginal hairs are largely developed and have beautifully curved extremities, the 
claws are slender and moderately long and nearly similar in length and thickness ; 
the middle tarsi are clothed beneath in a similar manner to the front feet, their 
outer claw is more elongate and less thick than in Dytiscus adspersus and is decidedly 
longer than the more slender and more curved inner one: the female has the 
reticulation on the outer parts of the wing-case deeper than it is in the male. 
This species is very similar in form to Dytiscus adspersus, but is entirely pale 
beneath, and the anterior claw on the front and middle feet of the male is more 
elongate and slender ; it is smaller and more depressed than Colymbetes consputus, 
and the male tarsi are less incrassate. 
Europe, (Spain, Escorial, Valladolid). 902. 
956. Dytiscus cicurus, Fab., Colymbetes cicur, M.C._—Suboblongus, per-elongatus, 
nitidus, subtus piceus, supra capite nigricante, anterius et in medio verticis rufes" 
cente, prothorace nigricante, disco vage dilutiore, lateribus late rufis, elytris testaceis, 
punctis nigris magnis irroratis, his punctis subvittatim confluentibus; antennis 
