On Aquatic Carnivorous Coleopiera or Dytiscida. 681 
1064. Thermonectes simulator, n. sp.—Ovalis, haud latus, transversim convexus, 
levigatus, nitidissimus, subtus niger, supra nigro testaceoque variegatus, thorace 
anterius et posterius conspicue nigro-lineato, elytris eequaliter nigro-vermiculatis, 
antennis pedibusque anterioribus rufis, pedibus posterioribus nigricantibus, femori- 
bus ad apicem rufescentibus ; elytrorum epipleuris per-angustis. Long. 142 lat. 
82 m.m. 
Fem., pernitida, elytris versus basin in medio sparsim vix perspicue punctatis. 
This species is remarkable inasmuch as the coloration of the upper surface repeats 
almost with perfect exactness, that of the European Dytiscus cinereus (No. 1088), 
In the male the smaller palettes on the undersurface of the front tarsi are largely 
developed, while the three larger ones are of rather small size, and differ but little 
In size inter se, so that they present but a shght contrast with the smaller palettes. 
The sexual sculpture of the female is so slight that it will be overlooked without 
a careful examination. 
I have seen only one pair of this remarkable Thermonectes. 
South America, (Parana). 977. 
Group 2. 
1065. Acilius duponti, Aubé, M.C.—Convexus, sat latus, leevigatus, nitidus, 
niger, capite anterius et in medio verticis, prothorace ad latera fasciaque parum 
extensa in medio, elytris plaga humerali, maculis basalibus, fascia submediali aliaque 
subapicali interrupta, antennis pedibusque anterioribus testaceis ; epipleuris latis. 
Long. 134, lat. 7% m.m. 
Fem., nitida, elytris in medio ad basin lineolis brevibus impressis. 
I have seen only a single individual of this species, which seems allied both to 
Hydaticus variegatus (No. 1063), and Dytiscus interruptus: it is more narrowed 
in front than the former, but not so broad behind the middle as the latter. The 
yellow colour on the thorax is much diminished in its extent, the anterior black 
mark having its termination jointed to the posterior one, so that the slender line of 
yellow enclosed by these two marks is isolated from the lateral patch of yellow. 
South America, (Brazil). 968. 
1066. Dytiscus interruptus, Sturm., Acilius interruptus, M.C—Latus, anterius 
conspicue angustatus, subtus convexiusculus, levigatus, nitidus, niger, prosterno 
anterius piceo, capite anterius et ante verticem, prothorace in medio et ad latera 
elytrisque humeris, fascia submediali maculisque apicalibus testaceis, pedibus pos- 
terioribus piceis, femoribus nigricantibus, pedibus anterioribus testaceis ; epipleuris 
latis. Long. 122, lat. 7% m.m. 
