44 , (FEBRUARY, 
Exmis Latr. 
1. E. bivittatus, piceus, elongatus cylindricus, antennis tarsisque flavis, 
thorace convexo, parce punctato, rufescente, margine antico nigro, lateribus levi- 
‘ter rotundatis, angulis posticis rectis, elytris punctato-striatis, vitta lata integra 
lutea utrinque ornatis. Long. :14. 
One specimen on the Upper Mississippi; judging from a drawing, this may be 
Elmis bivittatus De}. Cat. 
2. E. quadrinotatus Say, Journ. Ac. Nat. Se. 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. 
1.8. sinuatus, elongatus, piceus, thorace elongato, inequali, pone apicem 
magis angustato, angulis anticis porrectis, apice medio producto et rotundato, 
lateribus late sinuatis, elytris punctato-striatis, interstitio 29do basi, 5'eque 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. crenatus, elongatus, ater, thorace elongato, inzequali, ante medium‘ 
angustato, angulis anticis porrectis, apice medio late rotundato, lateribus late 
subsinuatis, elytris. punctato-striatis, interstitio 20do basi 5'cque carinatis, anten- 
nis ferrugineis. Long. 12. 
Elmis crenatus 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 inzquali, an- 
trorsum angustato, lateribus rectis, elytris profunde punctato-striatis, interstitio 
5to 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. pusillus, ater, thorace inequali, impressione oblonga ad medium, 
carinaque utrinque laterali notato, lateribus subrectis, elytris punctato-striatis, 
interstitio 29do basi, 4te usque ad medium, 5teque carinatis, macula humerali, 
alteraque subapicali Juteis obsoletis, antennis tarsisque furrugineis. Long. :08. 
Rapids of Niagara, June, abundant. 
Macronycuus Mill. 
1. M. glabratus Say, Journ. Ac. Nat. Sc. 5, 187. Pennsylvania, Melshei- 
tr: Vermont, Prof. Adams. 
2. M. lateralis Mels. Proc. Ac. Nat. Sc. 2,99. Unknown to me. 
Ancyronyx Er. 
1, A. variegatus Er. Ins. Deutschl. 522. Macronychus variegatus 
Germ. Ins. Nov. 89: Sturm Cat. 204, 63, tab. 2,12: Elmis cinctus Say, Journ. 
Ac. Nat. Se. 5, 186. 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. 
Groryssus Latr. 
1. G. pusillus, rotundatus, niger, thorace subtiliter canaliculats, ante 
medium vix transversim impresso, antice rugose punctato, postice lineola 
