SPECIES OF THE QENF3 DIABEOTICA. 225 



Hah. Magdalena Elver ; Muzo ; Medellin : my collection. 

 Amalfi : collection of H. Steinheil. Also Mexico, New Grranada, 

 Ecuador, and the Amazons. 



Antennae filiform, second and third joints of antennae very- 

 short, equal, the fourth nearly as long as the three basal joints 

 united. Thorax subquadrate ; sides parallel, very slightly sinuate, 

 slightly converging at the apex ; disk very minutely but not 

 closely punctured, impressed on either side with a large deep 

 fovea. Elytra narrowly oblong, closely punctured, each with 

 four or five raised longitudinal vittae, obsolete at base and apex, 

 their interspaces concave. 



Very close to D. inconsfans, agreeing in the sculpturing of the 

 elytra, but differing in the coloration, which in the present species 

 is fairly constant. The basal fascia is in some specimens divided 

 into two patches, one on each elytron. 



28. DiABROTiCA MUTABiLis. Anguste oblonga, postice vix arapliata, 

 convexa, prasina, nitida ; abdomine flavo ; capite, scutello pectoreque 

 nigris, tibiis tarsisque pipeo-nigris ; antennis piceis, articulis ultimis tri- 

 bus sordide fulvis ; thorace quam longiori pauUo latiori, dorso obsolete 

 bifoveolato ; elytris oblongis, sat crebre [junctatis, basi fasciaque vix 

 pone medium posita, nigris ; disco pone faseiam interdum fulvo tincto. 



Long. 3 lin. 



Mas, Antennis magis robustis, articulis intermediis paullo incrassatis. 



Foem. Antennis gracilibus, filiformibus. 



Var. A. Elytrorum plaga subbasali alteraque pone medium flavo-fulvis, 

 tibiis fulvis. 



Var. B. Elytris totis prasinis. 



Var. C. Elytris flavis, prasino limbatis. 



Sab. Medellin, Magdalena River, Bogota. Var. C. Caracas 

 (Thieme). Venezuela. 



Head scarcely longer than broad, subrotundate ; clypeus 

 with a longitudinal ridge ; front impressed with a deep fovea ; 

 second and third joints of antennae short, equal. Thorax broader 

 than long ; sides parallel and slightly sinuate from the base to 

 beyond the middle, thence obliquely converging to the apex; 

 upper surface nearly impunctate, transversely convex, flattened 

 on the disk, obsoletely bifoveolate. Elytra oblong, convex, rather 

 coarsely punctured ; humeral callus with a short, ill-defined 

 longitudinal ridge. 



29. DiABROTicA Gemmingeri. Anguste oblonga, postice paullo am- 

 pliata, convexa, laite viridis, nitida ; abdomine flavo ; pectore, femori- 

 bus apice, tibiis, tarsis, scutello capiteque nigris ; antennarum articulis 

 LINN. JOURN. — ZOOLOGY, VOL. XIX. 18 



