1852.] 103 



38. A. coracinus, elongatus niger, brevissime pubescens, capite subquad- 

 rato, basi subemarginato, thoraceque longiusculo postice angustato confertim 

 punctulatis, elytris elongatis, basi truncatis, grosse punctatis. Long. '17. 



Two specimens from the Upper Mississippi. This species differs from all the 

 preceding by the thorax being perfectly without a basal margin, even at the 

 sides. The head is wider than the thorax, subquadrate, posterior angles broadly 

 rounded, base slightly emarginate, and impressed in the middle ; it is finely and 

 tolerably densely punctured; the eyes are small ; the antennae moderately thick. 

 The thorax is longer than wide, a little narrowed behind, punctured as the 

 head ; anterior constriction distinct. Elytra scarcely wider than the head, 

 parallel, truncate at base, strongly and coarsely punctured, base very slightly 

 prominent each side ; the pubescence is scarcely visible. The male has the 

 pygidium prominent. 



39. A. pall ens, pallidus, subtiliter punctulatus pubescens, capite parce 

 granulato-punctato, medio laevi, triangulari, basi emarginato,'thorace transverse 

 postice valde angustato, elytris convexis, 'basi truncatis, abdomine nigricante. 

 Long. 'll. 



Lee. Agassiz' Lake Superior, 231. 



Shores of Lake Superior. This and the next species differ from all the 

 others, in having the head triangular, with the posterior angles almost acute, 

 and the surface granulated. The eyes are moderately large. The antennae are 

 slender and long ; the thorax is transverse and much narrowed behind. The 

 terminal spurs of the tibiae are very distinct, and those of the anterior tibiae 

 unequal ; in the male the anterior tibiae are slightly sinuate internally, and the 

 terminal spur more prominent. 



40. A. granular is, nigro-piceus, pubescens, capite thoraceque confertim 

 granulatis, illo triangulari basi emarginato, hoc transverso, postice valde angus- 

 tato, elytris basi valde truncatis confertim punctatis, apice testaceis, antennis 

 tibiis tarsisque testaceis. Long. '13. 



Lee. Agassiz' Lake Superior, 231. 



Lake Superior, abundant. Varies in color : et. elytra testaceous, with a broad 

 black band ; /2. testaceous, band of the elytra and abdomen black ; y. testaceous, 

 elytra with an indistinct fuscous spot at the middle. The sexual niarks as in 

 the preceding, with which this species agrees in form. Both species vary in 

 having the thorax sometimes obsoletely channeled. 



Species unknown to me : 



A. exilis Ferte, Anth. 121. 



A. ictericus Ferte, Anth. 149. 



A. laetus Ferte, Anth. 157. 



A. melancholicus Ferte, Anth. 174. 



A. pusillus Ferte Anth. 178. 



A. squamosus Ferte, 216. 



A. lugubris Ferte, 217. 



A. pallidus Say, Jour. Ac. Nat. Sc. 5, 245 5 Ferte, 275. 



A. impressipennis Ferte, 300. 



A. texanus Ferte, 301. 



Tanauthrus Lee. 



This genus was founded by me in the 5th volume of the Annals of the Lyceum 

 of Natural History, upon a very singular insect having the appearance of a 

 Zuphium. More careful examination has convinced me that my Anthicus alu- 

 taceus, described in the same place, must also be referred to this new genus; 

 the mould on the specimens having prevented me at that time from seeing the 

 generic characters. The following characters will separate this genus : 



Antennse in frontem insertae, sub-12-articulatae, articulo llmo elongate, quasi 

 diviso, intermediis turbinatis. Tarsi articulis cylindricis, 4to minore non bilobato ; 

 elvtra depressa, apice truncata, abdomine breviora ; corpus depressum, capite 



16 



