AMERICAN COLEOPTERA. 389 



posterior coxse small. Legs variable, generally slender, never very 

 stout ; femora mutic or dentate, more or less clavate (posterior 

 strongly incrassate in OvcJtedomeru>i) ; tibise very variable, acutely 

 angulate near the base in Cuemogonm and CraponiuH, external apical 

 angle of the anterior tibiie produced into a toothed j)rocess in Cne- 

 mogou.as and Accuithoaceli^, the middle and posterior fre<iucntly 

 eniarginatc above the apex, the emargination generally with a row 

 of stiff bristles ; tarsi generally slender, third joint bilobed, rarely 

 narrow {RileyoiiymKs, Phltohuts). Claws biiid, toothed or simple; 

 a single claw only in Monoinjchnx. 



I have foUowed Dr. LeCoiite in arranging the genera under four 

 well defiu(Ml pi-imary divisions, to which, liowevcr, 1 prefer to apply 

 the term " subtribe" instead of " group," as was done by that author. 

 Lacordaire included MoiioiiijcJnif! among his Orliodex, but the extra- 

 ordinary characters presented by that genus fully wai-rant the jjlan 

 adopted by Dr. LeConte. 



The subtribes are distinguished as follow's : 



Pygidium without transverse line for the reception of the elytra, pectoral groove 



extended npon the metasternum, tarsi with a single claw- . • • ilononi/chi. ^3 * ' 

 Pygidium with transverse line for reception of the elytra and carinate in front, 

 tarsi with two claws. 

 Pectoral groove extending upon the niesosternum, rarely ujton the metasternum. 



Oeliodes. p. 310 

 Pectoral groove not extending ujion the mososternom. 



Beak long and slender Ceutorhi/nchi. (F-^''^ 



Beak stout, generally short Phytohii. lo- ¥*'6' 



Subtribe Mononych i 



But a single genus constitutes this tribe. Easily recognize<l by 

 the transverse elevated line of the pygidium, the narrow, sharply 

 defined pectoral groove extending well upon the metasternum and 

 the single tarsal claw. The pygidium is (piite protuberant in the 

 male, smaller and excavate in the female; beak long and slender, 

 antennie with 7-jointed funicle ; second ventral segment as long at 

 middle as the two following segments united, the latter with a me- 

 dian glabrous space, third segment not narrowed at the extremities. 

 Legs slender, articulating surfaces of the tibiie ascending, margined 

 with a row of stiff settc and permitting of complete extension of the 

 tarsus upon the tibi?e ; tarsi moderate, third joint broadly bilobed, 

 fourth rather short, with a single claw. 



The genus Mononychus Germ, is represented in our launa by a 

 single species. 



TRANS. AM. KNT. SOC. XXIII. SEPTEMBER, 1896. 



