492 D y~t if c u s. 



ano faspe obfcuriori. Pedes rufo- ferrugtnei, tarfis 

 anticis maris ronnihil dilatatis. 



Var. b. differt tantum macuia bafeos elytrorum 

 abbreviata, nec in lineam longitudinalem produ&a, 

 maculisque lateralibus minoribus; Corpus etjam fa- 

 turatius brunneum, abdomine poftice nigricanfce. 



In var, c. caput poftice latius nigrum , punclis 

 rufis verticis minoribus, magis obfoletis; thoracis 

 fafcia rufo - pallida, in medio late interrupta, ut 

 thorax potius niger dici queat, macula cuneata pal- 

 lida iaterali utrinque; Elytrorum margo tenue paU 

 lidus, pone humerum ramulum hamatum obliquum 

 emittens; macula bafeos parva, fimplex, acuminata; 

 Jntra marginem lateralem, paulio pone medium, 

 pun&a duo parva, paria, interdum coalita, & intra 

 apicem folitarium rotundatum, omnes rufo- pailidae, 

 obfoletae; Corpus fubtus nigro-brunneum, pecfcore 

 dilutiori. 



Var. d. fimillima var. c, fed vertex adhuc latius 

 niger, maculis ruiis obfoletis, & eiytra nigra imma- 

 cutata, folo margine laterali angufte rufo - teftaceo ; 

 Elytra in var, c & d, paulio fortius punttulata ap- 

 parent. 



Obf. Varietates a & b faepe accurrunt tatae te- 

 ftaceae, fignaturis albidis; forte nuper exciufae. 



25. D. arcticus: ablongo-ovatus, fubtiiis- 



fime reticulato-ftrigofus, niger, thorace 



fafcia pallida, elytris fufeis margine pailidis. 



Payk. fn. 1. 201. 10. Schonh. fynon. 3. 23. 70, 



t Var. b. Thorace nigro, lateribus late paiiidis. 



Habitat in aquis Lapponiae fat frequens. 



Defcr. D. maculato vix. brevior, fed multo an- 

 guftior. Caput fubtiliffime creberrime reticulato-ftri- 

 -gofum, antice late rufo- paliidum, vertice nigro, 



ma« 



