3-t' I Fcl'viiary, 



interstices therefore rather narrower, but still very flat on their surauuts. This 

 difference in striation is to be observed in other species, e. g., Endymion, Har., and 

 Pi/rois, Bates. 



On the whole I am of opinion that it is convenient to retain the 

 name Oxysternon suggested by Castelnau (Hist. Nat., vol. ii, p. 82, 

 1810) for the group of Phancei characterized by the spiniform pro- 

 longation of the metasternum, coupled with a scutelliform lobe at the 

 middle of the basal margin of the thorax. Hope was the first to 

 separate them (Coleop. Man., p. 51, 1837), but under the already 

 occupied generic name of Sternaspis. Lacordaire, on the other hand, 

 does not deem these characters sufiicient for generic distinction ; but 

 having examined and dissected numerous examples, it appears to me 

 that this is a very well defined little group, having a characteristic 

 facies in both sexes, quite worthy of a separate name. The two 

 species here described fall naturally into this group. 



OXYSTEKNON MacLeATI. 



Head black, with a metallic-green patch in front of the eyes ; clypeus slightly 

 emarginatc, rugosely punctate. Head horn erect, rather short and slender. Thorax 

 smooth, shining green, anterior angles hardly produced ; centre with broad, some- 

 what bilobed, excavation, bordered laterally by triangular laterally compressed 

 elevations, the apices of which, broadly black, are slightly incurved ; the basal 

 portion connecting these elevations is smooth, flat, and black in colour. The exca- 

 vation, and those places generally where the dark colour meets the green, usually 

 flushed with orange or carmine. A strong black carina runs on each side from the 

 lateral margin to the base of the elevations. Elytra purplish-black, with metallic- 

 green margins, strongly striate, the interstices narrow, convex, and minutely punctate. 

 Pygidium brilliant green, closely punctate. Under-side entirely purplish-black. 

 Metasternum black, with long anterior spine, smooth, with very minute punctures ; 

 central sulcus ill defined, sometimes flushed with red or green at its lateral margins. 

 Femora and tibise black. Anterior tibiee bluntly tridentate. Pubescence dark 

 fulvous. Antennae bright fulvous. 



Female with simple straight carina on head. Thorax broad, green, with a 

 slender, slightly trituberculate carina above the anterior margin. Behind the central 

 tubercle, which is the largest and most advanced, and on either side of the carina, 

 is a shallow depression. Centre of thorax occupied by a large black macula of 

 varying form, sometimes nearly covering the entire surface. Anterior tarsi very 

 slender, with two long apical bristles. Long., 17 mm. 



MncLeayi^ E-eiche, in lift. 

 Para and Amazons generally. 



OXTSTEIINON PTERODERUM. 

 Dark bluish-green. Clypeus slightly emarginate, with a blackish border, coarsely 

 punctate ; on the vertex is a smooth quadrate plate, sparsely punctate, bordered in 



