North American Histeroides. 85 
Thorax posticé linea punctorum majorum impressus. Elytra 
stria basali obliqua obsoletissima, abbreviata: lateralibus pro- 
fundis. Prosternum breve, leviter bistriatum, mesosternum an- 
ticè arcuatum, cum poststerni parte antica medio depressum. 
Podex levissime puncticulatus. : 
Precedentem valdé refert, sed thorax posticé non margina- 
tus, et podex fere levis. 
Species obscure, aut nobis incognite. 
l. Hister memnonius, Melsh., Say, Journ. Acad. Nat. Sc. 
Philadelphia, Vol. V. p. 32. 
“ Inner thoracic stria abbreviated a little behind the middle, 
elytra each with a basal puncture, Elytra with the marginal 
and four dorsal stris entire, the fourth hardly reaching the 
base, fifth less than half the length of the elytron. Anterior 
tibie 4-dentate.” 
Hee species thoracis stria interiore abbreviata insignis. 
Erichsonio eadem ac merdarius habebatur; nobis tamen, H. 
obtusato confinior videtur ; striatione tamen thoracica ambabus 
abhorret, (Vide Obs. post H. depuratoris descriptionem.) 
2. Hister thoracicus, Paykull, Monographia, Hist. p. 20. 
Tab. II. Fig. 6. ; 
“Niger, parum nitidus. Frons stria integra. Thorax bis- 
triatus, stria externa in medio abbreviata, interna integra, 
margine oculo armato subtilissime, confertissimé punctulato. 
Elytra oculis nudis levia, armatis, striola marginali in medio 
abbreviata, tribusque primis dorsalibus subintegris, introrsum 
areuatis, omnibus obsoletis, levissimis. Abdomen. puncticula- 
tum; tibiis anticis 4-dentatis." E > 
3. Hister incisus, Knoch-Erichson, Klug’ s Jahrbücher der 
Insectenkunde, Erster Band, p. 134. ` echar 
tbicularis, ater, opacus. Frons stria profunda, medio sub- 
obliterata. Thorax lateribus ciliatis, bistriatus, striis antice 
Paulo abbreviatis, sulcis parvis prope marginem anteriorem, 
“ubprofundis. Elytra stria suturali et marginali nullis, qua- 
Or primis dorsalibus integtis, quinta post medium anticé 
