SPECIES OF THE GEKUS DTABROTICA, 237 



a short distance below tlie middle, when they become obsolete ; 

 spaces between the vittse rather strongly subseriate-punctate. 



Closely allied to D. similata, the raised vittse on the elytra 

 much finer, the discoidal white stripe obsolete. ^ 



51. DiABROTiCA PERPLEXA. Eloiigata, postice vix ainpliata, modice 

 convexa, nigra, nitida ; antennis apice piceo-fulvis ; thorace flavo, bi- 

 foveolato J elytris obsolete elevato-vittatis, subtiliter subseriato-punc- 

 tatis, punctis ad apicem deletis j limbo laterali angusto, ante apicem 

 obsoleto, maculaque parva oblonga ante apicem, flavis; femoribus 

 basi, tibiis anticis intus, posticisque basi, fulvis. Long. 2 lin. 



Hob. Magdalena Eiver ; a single specimen. 



Head longer than broad ; encarpae well defined, transverse, 

 subquadrate ; clypeus with a strongly raised longitudinal ridge ; 

 antennae three fourths the length of the body, obsoletely thickened 

 towards the apex, the two upper joints (the extreme apex of the 

 terminal one excepted) piceo-fulvous. Thorax scarcely one half 

 broader than long ; sides nearly parallel from the base to some 

 distance beyond the middle, thence slightly converging to the 

 apex ; upper surface minutely and distantly punctured, the punc- 

 tures more crowded at the base : disk impressed on either side 

 with a large shallow fovea. Elytra oblong, convex, slightly flat- 

 tened along the suture, finely subseriate-punctate, the punctures 

 entirely obsolete posteriorly ; each elytron with five or six very 

 slightly raised, ill-defined longitudinal costse, which extend nearly 

 the whole length of the disk ; the punctures between the vittse 

 irregularly arranged m double rows. 



The form of the thorax will separate this species from D. medio^ 

 vittata, var. A. 



52. DiABROTiCA MEDioviTTATA. Anguste oblonga, convexa, nitida, 

 subtus nigro-picea; pedibus nigris, femoribus (dorso piceo-lineatis) 

 tibiisque anticis intus flavis ; supra nigra ; antennarum articulis duobus 

 apicalibus sordide fulvis; thorace flavo, disco profuiide bifoveolato, 

 spatio inter foveas depresso ; elytris tenuiter sed distincte punctatis, 

 punctis apicem versus fere deletis, disco externo subseriatis, utrisque 

 limbo laterali, ante apicem abbreviate, vittaque lata a basi fere ad 

 apicem extensa, apice interdum leviter excurvataet dilatata, flavis aut 

 flavo-albidis. Long. 2i Un. 



Var. A. Elytrorum vitta discoidali interrupta aut obsoleta. 



Hah. Eastern Colombia (Winkler) ; Sta. Martha. 

 Head longer than broad, trigonate ; antennae filiform, third and 

 fourth joints equal, each much longer than tlie second. Thorax 



