44 [February, 



Elmis Latr. 



1. E. bivittatus, piceus, elongatus cylindricus, antennis tarsisque flavis, 

 thorace convexo, parce punctato, rufescente, margine antico nigro,lateribus levi- 

 ter rotundatisj angulis posticis rectis, elytris punctato-striatis, vitta lata Integra 

 lutea utrinque ornatis. Long. '14. 



One specimen on the Upper Mississippi; judging frona a drawing, this may be 

 Elmis bivittatus Dej. Cat. 



2. E. quadrinotatus Say, Journ. Ac. Nat. Sc. 5, 187. Elmis vittatus 

 Mels. Proc. Ac. Nat. Sc. 2, 99. Common in the Middle States. Dr. Melshei- 

 mer's species, as I know by actual inspection, is only an immature specimen of 

 the not unusual variety with the spots confluent forming a vitta. This species 

 is much smaller and less cylindrical than the preceding : the feet are sometimes 

 entirely ferruginous. 



Stenelmis Dufour. 



1. S. s i nuatus, elongatus, piceus, thorace elongato, inaequali, pone apicem 

 magis angustato, angulis anticis porrectis, apice medio producto et rotundato, 

 lateribus late sinuatis, elytris punctato-striatis, interstitio 2ndo basi, 5ti'que cari- 

 natis, macula humerali alteraque subapicali flavis ornatis, tarsis antennisque 

 ferrugineis. Long. 12. 



One specimen Tolula, Georgia : the thorax is elevated in the middle, deeply 

 channelled, and has two tubercles on each side near the margin. 



2. S. cr en at us, elongatus, ater, thorace elongato, inaequali, ante medium 

 angustato, angulis anticis porrectis, apice medio late rotundato, lateribus late 

 subsinuatis, elytris punctato-striatis, interstitio 2"^" basi 5i<'que carinatis, anten- 

 nis ferrugineis. Long. 12. 



Elmis crenatiLs Say, Long's Exped. 2, 275. Pennsylvania, Melsheimer : Ni- 

 agara : the thorax is less suddenly narrowed in front, and the sides not widened 

 at the apex, but parallel : the sculpture as in the last. 



3. S. bicarinatus, elongatus, ater, thorace elongato, vix inaequali, an- 

 trorsum angustato, lateribus rectis, elytris profunde punctato-striatis, interstitio 

 5^0 carinato, vitta angusta lutea ornatis, antennis tarsisque ferrugineis. Long. 

 12. Ohio, Haldeman : the impressions of the thorax as in the preceding, but 

 very faint. 



4. S. pu s i 11 u s , ater, thorace inaequali, impressione oblonga ad medium, 

 carinaque utrinque laterali notato, lateribus subrectis, elytris punctato-striatis, 

 interstitio 2"du basi, 4'" usque ad medium, Si^^^que carinatis, macula humerali, 

 alteraque subapicali luteis obsoletis, antennis tarsisque furrugineis. Long. '08. 

 Kapids of Niagara, June, abundant. 



Macronychus Miill. 



1. M. glabratus Say, Journ. Ac. Nat. Sc. 5, 187. Pennsylvania, Melshei- 

 mer : Vermont, Prof. Adams. 



2. M. lateralis Mels. Proc. Ac. Nat. Sc. 2, 99. Unknown to me. 



AiNCYRONYX Er. 



1. A. variegatus Er. Ins. Deutschl. 522. Macronychus variegatus 

 Germ. Ins. Nov. 89 : Sturm Cat. 2"*^, 63, tab. 2, 12 : Elmis cinetus Say, Journ. 

 Ac. Nat. Sc. 5, 18G. Pennsylvania, Vermont, Adams. Germar's name has 

 precedence by one year. 



Although not belonging to this family the following may here be added on ac- 

 acount of its close relation. 



Georyssus Latr. 



1. G. pus ill us, rotundatus, niger, thorace subtiliter canaliculats, ante 

 medium vix transversim impresso, antice rugose punctato, postice lineola 



