OF THE UNITED STATES. J'l| 



1. L< HNOi EU PIS /. . 

 Corpus elongato-cllipticum, planum ; mandibular acute, prominulae; labrum subquadratum, anl 

 leviter emarginatum; mentum medio fortiter dentatum; ligula apioe dilatata, truncata : palpi t< i 

 longiusculi, articulo ultimo leviter ovali, non longiore; tarsi omnea minus i 



centcs, postcriores articulo l ra0 clongato, '■'< nter Be ffiqualibu . - mgitudine intermedio; 



tarsi antici maris articnlis 4 modice dilatatis, auadratis, latitudine longioribns, V" pi rparum an 

 : antennae tenues, filiformi -. 



The body is longer and more parallel, than in even the narrow species of Oodes ; il is 

 moderately acute in front, and obtuse behind. The only species known to me is Ooi 

 parallelus Say, (Trans. Am. Phil. Soc. 4, 120,) which may be thus characterized. 



I., par all el a. elongato-elliptica, antice acuta, nigro-picea, vi.\ convexa, tborace antrorsum valdo 

 angustato, lateribus rotundatis, subdiaphanis el late obsolete depressis, angulia po I 

 subemarginata, elytris non latioribus, interstitiis planis, 3 io postice unipunctato, antennis palpis tibiia 

 tarsisqae piceo-testaceis. Long. -42 — hit. -1"'. 



One specimen, Louisiana, Dr. Schaum. The rounding of the Bides of the thorax con- 

 tinues to the base, so that a distinct angle is formed between the thorax and elytra. 



Akatrichis /. . 



Corpus ellipticum, punctulatum antice acutum; mandibulse acute prominuloe; labrum parvum sub- 



quadratum; mentum medio fortiter dentatum ; ligula apice dilatata, truncata; anl aues fi)i- 



formes; palpi tenuis, longiusculi, articuli mazillarium ultimo fere duplo longiore; tai Hires 



subtus non pubescentes, sed lateribus setosi: tarsi antici maris articulis I leviter dilatatis, i 



ostioribus, subtus spongiosis; ti!>i;e intermedia: maris intus oblique emargin 



The type of this genus is Oodcs minutus Dej. (Sp. Gen. ~>. 677) the peculiar 

 id characters of which indicate the propriety of separating it as a distinct gen 

 the anterior tarsi of the male have the first lour points oblong and Blightly dilated, grow- 

 ing succi ssively narrower; the interior face of the middle tibite in the male presents an 

 oblique emargination, similar to thai of the anterior tibiae, bul li - deep: the portion be- 

 low the emargination is moderately dilated. Apart from these sexual chai we have 



nothing to distinguish the g cept the more elongate terminal | t of the maxillary 



palpi, and the punctulate upper Burface of the body. 



My specimens of this in eel wen found in Louisiana; the female was given me bj D 

 Schaum, and the male bj Mr Guex 



Oodi B 

 This genus differs from those above d< 3cribed in having the tirM three joints of the an- 



•r tarsi Btronglj dilated, nearly equal in breadth, and much \\ ider than the fourth j i : 



when the 7th stria of the elytra is entire, the dilated joints arc oblong ; when thai Btria 

 is obliterated, the dilated joints are broader and tran vi i e. Fert6 mentions I \nn. Enl 

 Tr. 2d Ser. '.', 271,) an 0. stenocephalu s, which from his very short descrip- 

 tion may li • my 0. picipes; but if so, he omits the most importanl difference between it 

 and 0. amaroides, with which he compares it, viz., the absence of the 7th elytral Blria. 

 Our species may be arrangi d as follow 

 vol. x. — 67 



