146 DESCRIPTIONS OF NEW SPECIES. 



emarginata ; elytris thorace baud latioribus punctatis, lituris pluribua 

 fuscis ornatis ; antennarum basi palpis pedibusque fusco-testaceis. 

 Long. -27. 



LEC. Class. Col. N. America, 252. 



One specimen, from Louisiana, given me by Mr. Guex. The 

 dark markings of the elytra are narrow spots, one of which com- 

 mences at the scutellum and becoming vfiry narrow runs along 

 the suture, another commences at the humerus and runs obliquely 

 for more than one-third the length : near its end and between it 

 and the subsutural line is a small spot ; the other spots form a 

 transverse undulated band behind the middle, and a subapical 

 blotch on each elytron.* 



The genus is evidently allied to Melandrya, but the fissure of 

 the anterior coxal cavities is narrower, and the trochautin smaller, 

 though quite visible ; the clypeal suture is less distinct. The 

 maxillary palpi are moderate in length, the 2d and 3d joints not 

 dilated, the 4th securiform, with the outer side not much longer 

 than each of the others, which are nearly equal. Th^ antennas 

 are moderately slender, with the 2d joint short, the 3d not much 

 longer than the 4th : the tip of the last joint is testaceous. The 

 lateral margin of the prothqrax is acute behind, and entirely 

 effaced before the middle, the base is sinuous, but not conspicu- 

 ously lobed. The tarsi are about as long as the tibiae, and the 



* The grouping of the genera of the tribe Melandryini, Class. Col. N. 

 America, pp. 249-252, has been rendered somewhat imperfect by the pro- 

 gress of investigation ; and the following table of groups and genera 

 should be substituted : 



A. Anterior coxae with a distinct exterior fissure ; 



Anterior coxae separated by the prosternum ; 



Third joint of antennae longer than the 4th. 1. PENTHES. 



Third joint of antennae equal to the 4th. 2. SYNCHROS. 



Anterior coxae contiguous ; 



Frontal suture distinct, trochantin visible. 3. MELANDRY/E. 



Frontal suture not visible, trochantin not visible. 4. SERROPALPI. 



B. Anterior coxae without exterior fissure ; trochantin 



not visible ; 



Anterior coxae contiguous. 5. DIRC^E^:. 



Anterior coxae separated by the prosternum. 6. OBCHESIJE. 



The first two groups each contain but a single genus of easy recogni- 

 tion. The table of the genera of the third group, given on p. 251 of the 



