0)1 Aquatic Carnivorous Coleopiera or Dytiscidce. 681 



1064. Thermonectes simulator, n. sp. — Ovalis, baud latus, transversim convexus, 

 Isevigatus, nitidisslmus, subtus niger, supra nigro testaceoque variegatus, thorace 

 anterius et posterius conspicue nigro-lineato, elytris eequaliter nigro-vermiculatis, 

 autennis pedibusque anterioribus rufis, pedibus posterioribus nigricantibus, femori- 

 bus ad apicem rufescentibus ; elytrorum epipleuris per-angustis. Long. 14^ lat. 

 8i m.in. 



Fern., pernitida, elytris versus basin in medio sparsim vix perspicue punctatis. 



This species is remarkable inasmuch as the coloration of the upper surface rej^eats 

 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 slight 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). 077. 



Group 2. 



1065. Acilius duponti, Aube, M.C. — Convexus, sat latus, laevigatas, 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. 13i, lat. 7f m.m. 



JFem., 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. 



Soutii America, (BrazU). 968. 



1066. Dytiscus interruptus, Sturm., Acilius interruptus, M.C. — Latus, anterius 

 conspicue angustatus, subtus convexiusculus, Isevigatus, 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. 12i, lat. 7| m.m. 



