OF THE l Ml'ED STATES. 



with D. simplex Dej.; D. opacus Ferte, I cannot identify clear I \ ; ;-p. < uncus sent I'nun 

 France under that name to .Mr. Guex, are nothing l>nt D. elongatue of a larg< c 

 than usual, but I am inclined to think that the original of Ferte is a true Bpeci 



It is ditlicult to determine whether D. ambiguua Ferte (Rev. TooL 1841, 48j and 

 Ann. l'.nt. Soc. Fr. loc. cit.) belongs to D. simplex, or to I), re lie \ us Lee: a new 

 < \uiuination of the specimen is required, ami -hould it be found to correspond with D. re- 

 flexus, that name must of course be suppressed. 



D. ovalisZrc. seems distinct from I), furvus Dej.; its form is a little broader, th< 

 interstices of the elytra are all equal, and the 8th is more acutely elevated. 



The two following species are so distinct as to be well worth] <>l description: 



1. D. c o s t a t u s, oblongus, crassus, nigcr, subopacus, thoracc transverso, lateribos ]<l:miuscnlis, 

 antico valde rotundati3, impressione transversa postica profunda, basaliboa parvifl, elytris interatitiia 

 subconvexi-. 7 ralde eleyato. Long. "95 — lat. 



Texas: two specimens collected by Lt. rlaldeman, and one Bent me by Dr. Schaum. 

 This species is related to D. Dcjeanii and dilatatus, but the elevation of the whole of the 

 7th interstice of the elytra at once distinguishes it : the sides of the thorax are much mor< 

 rounded in front, and the depressed lateral portions arc more uniformly lint ■ the basal im- 

 pressions are less defined. The elytra are more declivous, and from the greater elevation 

 of the 7th interstice the sides become nearly perpendicular, and they therefore do not 

 appear wider than the thorax. 



2. D. cr en a t u s, ovalis, niger, subnitidus, thorace non tra irorsum <ii- 

 biis subrotundatis, modict justice enbattenuat is fortiter pane tat titiia 

 convexis, 7 m " posticc gradatim minus clcvato. Long. "64. 



One specimen from Louisiana, given me by Dr. Schaum, whose name I have adopted. 

 The form of this Bpecies and the sculpture of the thorax is very much that of D. alter- 

 mans Dej.: the sti punctured Btrise of the elytra will at once separate it from all 



others. 



n. ' • (genuini.) 



In characters, the insects of this group agree v\ ith those of the next, except that thi 

 stria of the elytra and its scries of punctures are at the normal distance from the margin. 

 The characters to distinguish thi- group from Platyni and Pterostichi appear to bt 

 pendent on sexual structun usually dense pubescence of the upper surface, however, 



is an excellent empirical character, which enables them to he known at om 



The labrum is Hat, the mentum toothed : the firsl three joints of the antenn e gl 

 the anterior tibi I rider, or very slightly thicl carcely Bpinous at the tip : the males 



have three joint- of the anterior tarsi Btrongl) dilated, with rounded angles, and furnished 

 beneath with a dense brush. The ligula appears to bealways dilated and truncate at tip. 

 with distinct paraglossse: the palpi vary in form according t- 'id even 



that genera based upon then- structure, are by no mean ry. 



Our genera are Atranus Lee.; Eurydactylu /'-■ ; I hlceniu B ., and Dinod* B 

 the North American Bpecies of the last is unknown to me. 



