South American species of Diahrotica. 59 



elytris crebre puuctatis, ad latera plicatis ; utroqiie linea brevi basali, 

 communi, vitta submarginali a basi fere ad apicem extensa, in- 

 terdum ante apicem subinternipta, maculaque post-mediali inter 

 vittam et siitnrani posita, nigris. 



Long. 3— 3i lin. 



Hah. Amazons (Bates). My collection. 



Head not longer than broad ; clypeal ridge well-defined ; 

 antenna filiform, three-fourths the length of the body, the second 

 joint short, the third one-half longer, the fourth equal in length to 

 the preceding two united, two or three lower joints, together with 

 the three upper ones, piceo-fulvous. Thorax one-fifth broader than 

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

 middle, thence rounded and converging towards the apex ; above 

 convex, hinder disk excavated, trifoveolate. Elytra narrowly 

 oblong, slightly dilated posteriorly, moderately convex, strongly 

 plicate below the humeral callus, rather closely punctured. 



Spec. 104. Diahrotica confratcrna. 



Proc. Zool. Soc, 1889, p. 94. 



Oblongo-elongata, postice pauUo ampliata, convexa, flava, nitida, 

 pectore capiteque nigris, antennis ad basin piceis, ad apicem sordide 

 fulvis ; thorace convexo, obsolete trifoveolato, rufo-fulvo ; elytris sat 

 crebre punctatis, costa subhumerali vix elevata; utroque vitta brevi 

 basali, communi, altera humerali, a basi ad longe pone medium 

 extensa maculaque parva oblonga inter medium et apicem posita, 

 nigris. 



Long. 2^—3 lin. 



Hah. Upper Amazons ; a single specimen in my own 

 collection. 



Head not longer than broad, triangular ; clypeus with a distinct 

 longitudinal ridge ; antennas filiform, nearly four-fifths the length 

 of the body, the second joint short, the third nearly twice its length, 

 the fourth as long as the preceding two united ; the two lower 

 joints piceous, the three upper ones piceo-fulvous. Thorax rather 

 more than one-fourth broader than long ; sides very slightly pro- 

 duced before the middle, sinuate posteriorly, obliquely converging 

 towards the apex ; above convex, very faintly impressed with 

 three small fovese, two, one on either side the disk, only visible 

 when viewed obliquely, the third rather more distinct, subelongate, 

 placed on the medial line just in front of the basal margin. Elytra 

 narrowly oblong, very slightly dilated posteriorly, rather broadly 

 margined on the sides, regularly rounded at the apes, convex, 



