390 Appendix a d P. I. 



1 4. H. dorsalis p. 629. 



i5. H. planus p. 55 1. 



16, H. Lapponum p. 532. 



Obs. Hyphydrus marginatus, Kunze Nov. 

 Act. Hall. 2. 4. 67. 10. forte huc pertinet, vix vero 

 Dytiscus marginatus Dufts. Fn. Austr. 1. 269. 28. 



16- 17. H. rufifrons: ovatus^ convexus., 

 niger nitidus, profunde punctatus, parce 

 pubescens, capite antice, elytrorum basi 

 margineque pedibusque ferrugineis. 



Dytiscus fufifrons, Dufts. Fn. Austr. 1. 270. 3o. 



Hyphydrus axillaris, Dom. Schonherr in litteris. 



Habitat in aquis stagnantibus Vestrogotbiae 

 rarius. . 



H. plano fere duplo major, multo magis conve- 

 xus. Caput rotundatum, parum convexum , subtiliter 

 punctatum , antice late, vertice anguste ferrugineum, 

 in medio transversim indeterminate infuscatum ; oculi 

 depressi glauci ; antennae ferrugineae, extrorsum fusco- 

 annulalae. Thorax brevissimus transversus , antice 

 angustior, sinuato-emarginatus, angulis prominulis 

 acutis, lateribus oblicuiis, sub- rotundatis , basi bi- 

 sinuatus, lobo medio triangulari , angulis lateralibus 

 parum acuminatis; supra inaequalis , intra basin trans— 

 versim profundius impressus, niger, limbo omni con— 

 fertim evidenter punctato, disco transversim , elevato 

 laevi nitido; * margines laterales obscure ferruginei. 

 Elytra antice latitudine baseos thoracis et illo sextuplo 

 longiora , apice acuminata , supra convexa, confertim 

 et profunde punctata , nigra nitida , quasi oleo in— 

 uncta, pilis minutis cinereis depressis parce adspersa; 

 ad basin plaga transversa , suturam non attingens, aut 

 major, latior , aut minor , .ang.ustior, jam ferruginea, 

 jam dilutius testacea; margo lateralis indeterminate 

 ferrugineus. Corpus subtus nigrum nitidum , confer- 



tim 



