110 Mr. Martin Jacoby's descriptions of some new species of 



no doubt whatever that both species belong to the same 

 genus. Baly did not know the female sex of his genus, and 

 this difference in the structure of the antennae in the male 

 proves how little importance should be attached to sexual 

 characters only when genera are concerned. I see, for instance, 

 no reason why Doryclea should be separated from Platyxantha, 

 and the same may be said of my genus Metellus {Nacraa, Baly). 

 Both of us created this genus on the structural character of the 

 male, while the female cannot be separated from Platyxantha ; 

 and these remarks apply to a great number of genera of which 

 the males only are known. Like the male of D. insignis, the 

 present species has a short prolongation at the apex of the 

 posterior tibiae, and the last segment of the abdomen is incised 

 at each side ; the female has probably simple antennae in both 

 species, and does not differ in structural characters from Platy- 

 xantha. 



Platyxantha wallacei, n. sp. 



Black; the head, thorax, aud the femora fixlvoiis; antennae flavous ; 

 thorax transversely bisulcate, impnnctate ; elytra black, minutely pimctnred ; 

 posterior tibiae dilated; last abdominal segment flavous. Length, 3| hnes. 



Head impunctate, fulvous ; h-ontal tubercles transverse ; clypeus and 

 labrum flavous, the former strongly deflexed ; palpi rather slender aud long ; 

 antennae flavous, slender, the third joint shorter than the fourth, but elon- 

 gate, more than twice as long as the second joint; thorax about one-half 

 broader than long, the sides straight and narrowed at the base, rounded 

 before the middle, the anterior angles not prominent, the sm-face transversely 

 sulcate at each side, fulvous, impunctate, shining ; scutellum piceous ; elytra 

 with a shallow depression below the base, extremely minutely punctiired, 

 black, shining ; below black, the last abdominal segment and the femora 

 flavous ; posterior tibiae dilated and flattened at the middle ; last abdominal 

 segment trilobate, the middle lobe elongate. 



Hah. Sumatra. Collected by Mr. Wallace. 



The single specimen before me is apparently a male, and 

 may be known from P. nigripennis, Jac, by the dilated posterior 

 tibiae. The last three joints of the antennae are broken off. 



Platyxantha robusta, n. sp. 



Broadly oblong-ovate, fulvous ; the last joint of the antennae black ; 

 thorax subquadrate, convex, impunctate, without depressions ; elytra broader 

 than the thorax, very minutely punctured in indistinct rows. Length, 

 85 — 4 lines. 



Of broad and robust shape, entirely fulvous ; the head impvmctate, the 

 frontal elevations and the clypeus very strongly raised ; palpi strongly in- 

 crassate ; mandibles robust; antennae extending to the middle of the elytra, 

 fulvous, the terminal joint black, the third joint twice as long as the second, 

 but shorter than the fourth joint, two or three basal joints shining, the others 

 pubescent and opaque ; thorax one-half broader than long, the sides strongly 

 rounded at the middle, much narrowed at the base, the anterior margin con- 

 cave at the middle, the surface convex, shining, impunctate ; scutellum 

 fulvous ; elytra much broader at the base than the thorax, very convex ; the 

 punctures very fine, rather indistinct, and widely placed in irregular rows; 

 the lateral margin slightly thickened aud impunctate ; tibiae unarmed ; the 



