South American Eumolpida}. 485 



Mas. Head very finely punctured at the vertex, the latter shining, 

 with purplish reflections, clypeus separated by a anore rugosely 

 punctured space, its surface sparingly punctured, labrum and palpi 

 fulvous, antennae with the apical five joints black, the others fulvous ; 

 thorax twice as broad as long, the sides straight at the base, subangu- 

 late at the middle, narrowed towards the apex, the surface finely, 

 irregularly and not very closely punctured, the interstices with some 

 finer punctures, ceneous, the lateral margins narrowly metallic green ; 

 elytra with a small but distinct depression below the base, obscure 

 cupreous, rather finely punctate-striate near the suture, much more 

 strongly and irregularly so at the sides, the interstices at the apex as 

 usual costate ; below piceous, the breast metallic greenish, legs 

 fulvous, the tarsi nearly black, the anterior tibiae curved. 



Hob. Venezuela. 



In the semi-cupreous colour of the upper surface this 

 species seems to agree with R. civprinus, Lef., likewise 

 from Venezuela, but differs in having no intermediate 

 dark joints of the antennae, the thorax also is finely, not 

 strongly and confluently punctured as in Lefevre's species, 

 which is also a larger insect. I only know the male sex. 



Bhaldoptcrus amazonicus, sp. n. 



Dark aeneous, the labrum and the basal joints of the antennae 

 fulvous, thorax angulate at the sides, closely and finely punctured, 

 elytra with basal depression, more strongly punctate-striate, the 

 striae remotely placed, the interstices at the apex costate. 



Length 4 millim. 



Mas. Of short and broadly ovate shape, the head sparingly and 

 remotely punctured, the base of the clypeus and the space near the 

 eyes with some stronger punctures, antennae extending beyond the 

 middle of the elytra, the basal four and the eighth and ninth joints 

 fulvous, the others black ; thorax twice and a half broader than long, 

 the sides angulate before the middle, from there to the base straight, 

 the surface finely and rather closely punctured, but rather more 

 remotely so at the middle than at the sides, the interstices with some 

 still finer punctures, the extreme lateral margins metallic greenish ; 

 elytra with prominent shoulders and with a transverse dej)ression 

 below the base, rather finely and remotely punctate-striate, the 

 interstices near the apex moderately costate ; below of a more piceous 

 colour, the legs nearly black. 



Hah. Amazons. 



TRANS. ENT. SOC. LOND. 1900. — PART IV. (dEC.) 33 



