16 Mr. Joseph S. Baly on the 



Elytra narrowly oblong, slightly dilated posteriorly, their apices 

 conjointly regularly rounded, convex, sHghtly flattened along 

 the suture, distinctly and somewhat closely punctured, faintly 

 wrinkled. 



Spec. 18. Diahrotica decaspila. 



Ovata, postice ampliata, convesa.flava, nitida, pectore, femoribus 

 ad apicem, tibiis, tarsis, scutello capiteque nigris, antennarum apice, 

 articuli ultimi apice excepto, albido; thorace Isevi; elytris sub- 

 nitidis, utroque maculis rotixndatis quinque, 2, 2, 1 dispositis, flavis ; 

 abdominis apice piceo. 



Long. 4 lin. 



Hab. Cayenne. A single specimen in my own col- 

 lection. 



Head scarcely longer than broad, somewhat wedge-shaped ; 

 longitudinal ridge on clypeus well-defined ; antennae filiform, 

 three-foitrths the length of the body, the second joint short, the 

 third rather more than one-half longer, the fourth longer than the 

 preceding two united; the three or four basal joints more or less 

 stained with piceous, the three upper ones (the apex of the eleventh 

 excepted) white. Thorax one-half broader than long; sides 

 parallel and distinctly sinuate behind the middle, rounded ante, 

 riorly and converging towards the apex, the hinder angle slightly 

 produced ; disk convex, smooth, impunctate. Elytra oblong-ovate, 

 dilated posteriorly ; convex, impressed below the humeral callus 

 with a short broad longitudinal sulcation, very finely punctured ; 

 each elytron with five round flavous spots, placed in pairs, two 

 before, two scarcely behind the middle and one near the apex, 

 rather larger than the rest. 



The above species in form and in the disposition of 

 the spots on the elytra resembles D. regalis ; it is, how- 

 ever, separated by the presence of the longitudinal 

 sulcation below the humeral callus. 



Spec. 19. Diahrotica Jacohji, Baly. 

 Ann. & Mag. Nat. Hist., 5th ser., ii., p. 77, 1879. 

 Hah. Ecuador {Buckley). Unique in my collection. 



Spec. 20. Diahrotica elegantnla, Baly. 



Lin. Soc. Journ., xix., p. 213; Jac, Biolog. Cent. 

 Am., I. c, p. 504, pi. xxviii., fig. 21. 



ITah. Colombia (Var. A, Magdalena River) ; also 

 Central America. Coll. Baly (ttjpc) and Jacoby. 



