46 [FEBRUARY, 
Lamine tectrices intus quadrangulariter dilatate ; Anetastes Kirby. 
8. Caput sub oculis valde suleatum. 
Lamine tectrices anguste 
; : : : : - Hyzocnares Latr. 
b. Thorax marginatus, subtus ad latera sulcatus. 
Antenne tenues articulo 3i0 sequentibus longiore 0 Fornax Lap. 
Antenne tenues articulo 3io non longiore : : - IsSaARTHRUS. 
Antenne valde serrate vel pectinate : : : - Evconemis Ahrens. 
c. Thorax margine interrupto, vel medio obsoleto. 
Sulci antennales ad prosterni marginem siti, 5 - Microruacus Esch. 
B. Tarsi subtus laminiferi. 
Sulci antennales laterales - A - Gatpa Esch. 
I am not sure that the primary division into genera with and without tarsal 
appendages is natural, but as I have had no opportunity of examining any genus 
of the latter division, I do not dare to disturb the arrangement adopted by all pre- 
vious entomologists. From considerations derived from the study of other Elaters, 
Tam inclined to think that it would be better to divide this portion (B) among 
those that precede it, putting Galba next to Eucnemis in (b.) and the foreign 
genus Pterotarsus before Microrhagus in (c.). 
Me.asis Oliv. 
1. M. pectinicornis Mels. Proc. Ac. Nat. Sc. 2,148. Pennsylvania, Mels- 
heimer; Ohio, Schaum. 
Tuarors Lap. 
1. T.ruficornis. Melasis ruficornis Say, Journ. Acad. Nat. Sc. 3,166: 
Eucnemis (Nematodes) ruficornis Say, Trans. Phil. Soc. 6, 187. Missouri; the 
elytra are yellow, with the posterior half black: sometimes they are entirely 
yellow. ‘The antennz of the male are strongly flabellate. 
2. T. obliquus. Eucnemis obliquus Say, Trans. Am. Phil. Soe. 6,187. 
Ohio, Dr. Harris. My specimens are two fifths of an inch long, which is double 
the size mentioned by Say. 
EurRYPTYCcHUS. 
Clypeus ad apicem rotundatus: antenne articulo 1mo elongato, 3i° precedente 
longiore, 4—8 subequalibus crassitie paulo longioribus, 9—10 latioribus, et trip- 
. lo longioribus, 11 iterum longiore, elongato-ovali. Palpiarticulo ultimo dilatato, 
triangulari; prosternum postice promineus, mesosternum profunde excavatum ; 
tibie calcaribus apicalibus distinctis; tarsi tenues, articulo 1™° elongato; la- 
mine tectrices coxarum posticarum intus gradatim valde dilatate, apice suba- 
cute. 
The body is regularly arched, moderately wide for this family, and gradually 
narrowed behind the thorax : the thorax is much narrowed in front and rounded 
on the sides. The general aspect is precisely that of Ampedus. 
1. E. heterocerus. Hucnemis heterocerus Say, Trans. Am. Phil. Soc. 
6, 186. Pennsylvania, Messrs. Ziegler and Rathvon. 
Eprrpuanis Esch. 
The insect that I consider as belonging to this genus, differs from the preced- 
ing, in having the 8d joint of the antennz scarcely elongated: the four terminal 
joints in the male are equally enlarged, and each is about twice as long as the 
7th joint; the plates of the posterior cox are suddenly dilated within, and are 
broadly truncate at the extremity. Iam unable tosee the last joint of the palpi, 
which Eschscholtz describes as ovoid. 
1. E. cristatus, nigro-piceus, griseo-pubescens, capite punctulato, fronte 
tenuiter cristata, thorace antrorsum angustato subtilius dense punetato, linea 
media vix distincta levi, elytris parallelis punctatis, tenuissime striatis, anten- 
nis pedibusque rufo-piceis. Long. +20. New York, one male specimen. — 
2. KE. canaliculatus, nigro-piceus, griseo-pubescens, capite punctato, 
subtilissime carinato, thorace lateribus parallelis, ante medium rotundatis, con- 
