Coléoptères de Madagascar , etc. 193 



Ix. O. CYANicoLLis Aubé, Hydi'oc. , 736. — Long. 10 1/2 à 12 mill. — 

 Oblongo-ovalis, convexiusciilus, glauco-cssmleus, luteo-marginatus, dense 

 reliculato-punctulatiis, ochrosericeus ; capite prolliorace medio, elytris 

 plaga minima ad basin costaque carinata in disco, laevibus; prothoracis 

 elytrorumque margine inflexo luteo ; subtus nigro-piceus, pectore, abdo- 

 minis segmentis penultimis et pedibus rufo-lestaceis ; elytris apice paulo 

 oblique truncatis, angiilis exlernis rectis. — Madagascar. 



1. DiNEUTEs PROXiMUs Aubé , Hydroc, 764. — Long. 17 à 19 milL — 

 Oblongo-ovalis, depressus, antice valde angustior, supra nigro-olivaceus, 

 vix caeruleo-cupreo varians, subtile punctulatus, nitidulus ; elytris postice 

 rotundatis, pone apicem vix undulato-emarginatis, subtus nigro-ferrugi- 

 neus. — Madagascar (Ch. Coquerel). 



2. D. suBSPiNOSus Klug. — Aubé, Hydroc, 786. —Long. 8 1/2 milL — 

 Oblongo-ovalis, convexiusculus, supra nigro-piceus, vix œnescens, nitidus ; 

 elytris subtile striatis, postice rotundatis, serratis , pone apicem emargi- 

 natis, extus acute spinosis, vitta marginali viridi-cuprea, subtus nigro- 

 piceus. — Sainte-Marie de Madagascar (Ch. Coquerel). 



Hydrophilidfe. 



Hydrophilus ruficornis Klug, Ins. Madag., 159. — Long. 32 mill. — 

 Ovatus, nigro-olivaceus, aeneo-micans, capite antice sparsim punctato, 

 linea frontali longitudinali abbreviata média et arcuata transversa subti- 

 lissime irapressis, antennis rufo-testaceis, articulo quinto basi nigro, palpis 

 testaceis, prothorace lateribus sparsim punctato, elytris postice sensim 

 attenuatis , apice obtusis, lateribus punctatis , dorso punctato-striatis , 

 interstitiis ad strias utrinque subtilissime punclulatis, spina sternali abdo- 

 minis dimidii longitudine. — Madagascar (Ch. Coquerel). 



Ressemble à VH. ater, mais plus petit ; Fépine sternale est plus courte. 



1. Hydrous fulvo-femoratus. — Long. 16 mill. — Ovato-oblongus , 

 elliptîcus, convexus, nicjcr, nitidus, palpis, antennis femôribusque rufes- 

 centibus, capite ad ocnlos striato, antice idrinque punctato-strigato, pro- 



