On Aquatic Carnivorous Coleoptera or DytiscidoB. 759 



" Extremely variable in colour ; some specimens being nearly black, and others quite pale." 

 This appears to be a species of Rhantus very near Dytiscus signatus, No. 926, if not actually the same 

 thereas. — D. S. 



1220. Colymbetes dilatatus, Brulle, Exp. Mor. Ent. Ill, p. 127. Europe. 



" Kolar. ined. — Fuscus, levigatus, depressus ; capite maoulis 3 piceis ; elytris levissime seriato-punctatis, 

 maculis 2 pone medium pallida croceis ; corpora subtus cum femoribus posticis atro ; pedibus oreque at 

 antennis piceis. Long. 9 millim.,lat. 5. — (Voyez notra PL XXXIV, fig. 11.)" 



Descr. Tout le dessus de I'insecte est brun, at tres-finement guilloche ; la teta marquee de trois taches 

 rougeatres, savoir une vers le bord anterieur, de forme irr^guliere et plutot transversale, de couleur fonc^e, 

 et deux autres sur le bord posterieur, plus claires et arrondies ; antennes enti^rament rougeatres, ainsi 

 que las palpes. Corselet court, transversal, legerement sinue an avant et en arri^re ; ses angles 

 anterieurs pointus et avances, les posterieurs carres : outra un commencemeut de sillon longitudinal, on 

 distingue pres des bords anterieurs et posterieurs un sillon transversal dans toute la largeur du corselet ; 

 en arri^re ce sillon sa termine par des points enfoucfes, places a distances in^gales. Ecusson en triangle 

 ^Lirgi. Elytres un peu plus larges que la base du corselet, aplaties, ovalaii-es, marquees de quelques series 

 de points enforces peu profondes et ecartes ; un peu plus bas que le millieu des elytres, sur le bord lateral, 

 on remarque ime tacbe d'un jaune obscur de forme irreguli^re : a partir de cette tache jusqu' a la base, 

 le bord est un peu rougeatre. Tout le dessons du corps est noir, ainsi que les deux cuisses posterieures ; 

 jambes et tarsesde cette pa-'re de pattes et les deux paires precedentes rougeatres." 



" Hab. Dans les eaux stagnantes des marecages, qui se dessechent vers la fin de la belle saison. 

 Commxmique par M. de Laporte." 



It was suggested by Aube (Spec. p. 341) that this may possibly be a variety of Dytiscus guttatus (No. 

 670) ; this remains stUl uncertain, and it is not quite clear to me that Aube had really Brull6's species 

 before him when he supposed he was describing it (I. c.) — D. S. 



1221. Colymbetes discicollis, Aube, Spec. p. 250. Java. 



" Ovatus, supra flavicans, infra niger ; thorace disco nigricante ; elytris crebre nigro-irroratis ; prosterno 

 pallido. Long. 10 m.m. larg. 5 m.m. " 

 [This is followed by a description.] 

 I think this may pi-obably prove to be only Colymbetes pulverosus No. 924. — D. S. 



1222. Colymbetes discolor, Harris, New Farm. 1828, p. 164. 



" Black, minutely and obsoletely granulated. Head with two basal piceous spots ; elytra fuscous, 

 margin and base pale, epipleura yellowish ; three series of setiferous punctures, which are obsolete behind, 

 on each elytron : ventral segments at tip and feet piceous : nails alike in both sexes. Length over three- 

 tenths of an inch. " 



" Specimens five. Appears to diSer from all of the species described by W. Say. " 



. This is perhaps an Agabus, but the species to which the description is intended to apply will not be 

 recognised with any certainty. The name is not alluded to by Crotch, who however has changed the 

 name of Agabus discolor, Lee, for that of Gaurodytes lacontei, I presume on account of the existence of 

 this name of Harris'. — D. S. 



1223. Colymbetes distigma, Brulle, Voy. d'Orb. Col. p. 48.— Aube Spec. p. 222. South America. 



" Niger, opacus, punctis minimis raris oninino tectus ; macula in vertice et altera ad marginem elytro- 

 rum paullo ultra medium rubro-feiTugineis. Fern. Long. 14 m.m. larg. 7 m.m. " Aube, /. c. 

 [The above is followed by a description.'] 

 Found by D'Orbigny in the Cordilleras. 

 I cannot even form an idea as to what genus of the Colymbetides this will prove to beamember of — D. S. 



