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XVI. DcscrijJtions ofuncJiaracterised species o/ Diabrotica. 

 By J. S. Baly, M.E.C.S., F.L.S. 



[Read June 2nd, 1886.] 



In working out the Colombian species of Diahroticd 

 I had to examine a large series of others from other 

 countries. Some of these, which I believe to be un- 

 described, are characterised in the following paper : — 



Diahrotica riridana . 



Oblongo-ovata, convexa, prasiua, nitida, tibiis tarsisque nigris, 

 scutello anteunisque piceo-nigris, his basi pallida piceis, articulo 

 penultimo prasino ; thorace laevi, bifoveolato ; elytris subopacis, 

 crebre subrugoso-punctatis, disco leviter sed distincte elevato- 

 vittatis ; vittis latis duabus, una marginali alteraque sutiu-ali, 

 postice abbreviatis flavo-albidi.s, sutura auguste picea. Long. 

 2i lin. 



Hah. Chih. 



Head trigonate; antennae slender, filiform, the second joint 

 short, the third one-half longer, the fourth longer than the pre- 

 ceding two united; the three lower joints pale piceous, the penulti- 

 mate one pale green. Thorax about one-third broader than long ; 

 sides parallel and sinuate from the base to beyond the middle, 

 thence rovmded to the apex ; disk smooth and shining, rather 

 deeply bifoveolate ; elytra oblong, closely subrugose-punctate, the 

 disk of each with five slightly elevated but distinct longitudinal 

 costte ; each elytron with two broad ill-defined yellowish white 

 vittse, one marginal, the other sutural (these vittte, which com- 

 mence at the base, terminate some distance before reaching the 

 apex) ; humeral callus with a narrow longitiidinal piceous line. 



Diabrotica graminea. 



Ovata, convexa, flavo-fulva, nitida, capite, scutello, pectore, tibiis, 

 tarsisque nigris, femoribus antennisque prasinis, harum articulis 

 intermediis ultimoque nigris, penultimis duobus albidis ; thorace 

 lifivi, dorso non impresso ; elytris viridibus, convexis, prope 



XKANfcJ. l^NT. SOC. LOND. IbttG. PAF/1 IV. (DEC.) 



