AMERICAN COLEOPTERA. 57 



Basal cxcnvatioiis d' pn.tlii.rMx modprafo; color black, iirothorax yellow. % 9. 



Length .-) iiiiu.; I,. Sup.: If. B. T.Ti-.: X. Mrx :;. diifticiliM Lee 



Basal excavations of pi'.M Imrax larger: prothorax and elytra jiaie yell,,\v. % 9. 



Length (; nun.: C;,!.; Nev 4. flavida Lee. 



C. 



Basal impressions of prothorax very (lee|), hind angles strongly oarinated : ii]iper 



surface pale yellow 2. 



Basal impressions of prothorax miieh smaller, hind angles feehly earinated : Mack, 



prothorax more or less yellow.. 3. 



2.— Incisure of hind angles of prothorax deep, appendage straight. Length 



■''»'»: ••'■ :>. cava Lee. 



Incisure of hin<l angles hroad, appendage curved. Length (i mm. 



I'). |>alli<la ]\Iann. 

 .1.— Incisure of hind angles deep, appendage long. Length :> min. : fan. ; Mich. 



7. percoiiiis Say. 

 Incisure of hind angl<-s shallow. Mppcniiage short. Length (i mm.; Oi-. 



-S. vuliiorata Lee. 



n. 



Elytra and prothor.ix ]iale, the latter sometimes with a hlack dorsal vitta. Length 

 5—6 mm.; Oal 0. liitea Lee. 



Bhiek, prothorax yellow, sometimes with a hlack dorsal vitta. Length ."..(i mm.; 

 Cal 10. filigora Lee. 



K. 



Prothorax strongly margined, but not lohed at base; both processes narrow. 

 jiaral lei, directed outwards; black, j)rotliorax reddish-yellow, basal margin 



blackish. Length 4.5 mm.; Ill 11. ^paihulata n. sp. 



% antenna) nearly as long as the body, joints ;?— 10 about four times longer 



than wide, slightly broader at tip, therefore subserrate. 

 9 antennaj one-half as long as khe body, not serrate. 

 Trothorax broadly truncate at the middle of the base, then sinuate near the 

 angles, which arc produced into a large triangular plate; the jjostcrior 

 margin of this jilate is directed outwards, and the anterior margin outwards 

 and backwards; the anterior process of the incisure is directed obliquely 

 outwards and backwards; it is truncate at tip, and overlaps the basal 

 jirocess, so as to jiroduce the appearance of a perforation ; color ferruginous 

 yellow, antennre, ]ialpi, legs and elytra black, the last with pruinose pubes- 

 cence; head black, front reddish. Length 6 mm.; Texas, (Belfrage). 



12. perrorata n. sp. 

 % antennre three-fourths as long as the body, .scarcely stibserrate. 

 9 unknown. 



OITEM\US Lee. 

 This ocniis (lifters from Si/ia cliiefly by the much wider antennjc, and 

 tlic sides of pnttlinrax lobed in such manner as to present two incisures; 

 one near the tip formed by the thickened apical margin, the other near 

 the ba.se, between the two processes, which are obtuse, compressed and 

 directed outwards. Besides this the base is (in the typical species biden- 

 tatus), acutely nicked at the inner end of the posterior or basal process ; 



TI;\NS. AM. KNT. SOC. 1\. (1 d i >'AV. 1 SSL 



