228 METRIOTES. 



is attenuate, and somewhat more elongate than in the adjoining 

 groups ; the first and second joints are long and narrow ; the third 

 is very short ; the apical claw, which is completely concealed from 

 above by the globular inflation of the last joint, is bifid, and unarmed 

 at its inner surface by any basal tooth. 



The form of this genus is very interesting, inasmuch as it presents 

 several special peculiarities. In general facies it differs from all the 

 species composing the genus Hypolampsis by its depressed form and 

 subelongate posterior femora ; and a careful microscopic examination 

 shows still more interesting points of divergence, in its dilated ante- 

 penultimate joint of the maxillary palpi, and the series of spurs which 

 arm the marginatum of the posterior tibiae. 



1. Metriotes Robinsonii. (Tab. III. fig. 8.) 



M. ovata, paraUela, depressa, impubescens, punctato-striata, glabra, 

 jlava; capite transverso, antiee producto, ad basin punctulato; 

 thorace transverso, ad basin transverse foveolato ; elytris elonga- 

 tulis, punctato-striatis ; antennis filiformibus. 



Long. corp. If lin., lat. \ lin. 



Ovate, parallel, depressed, impubescent, punctate -striate, glabrous ; 

 of a flavous colour throughout. Head transverse, depressed, and pro- 

 duced iu front ; below the base of the antenna? is a slight transverse 

 depression ; the surface is levigate, at the base punctate. Thorax 

 broader than the head, transverse, anteriorly very slightly emarginate; 

 the anterior angles are depressed and quite distinct ; the sides are 

 marginate and obsoletely sinuate ; parallel to, and closely adjoining, 

 the basal line is a transverse thread-like fovea, which (exactly corre- 

 sponding in form to that in the genus Monoplatus) is not produced 

 to the lateral margins, but is deflected to the line of the base ; the 

 surface is finely punctate. Elytra somewhat broader than the 

 thorax, parallel, and depressed ; the surface is punctate-striate, 

 the punctures being distinct and the strioo almost obsolete ; the 

 scutellary angles are slightly raised. Antemue attenuate and fili- 

 form. Legs attenuate, the postical femora and tibiae being some- 

 what elongate. 



I name this species after Mr. E. H. Robinson, to whom I am 

 indebted for the care and diligence which he has shown as an artist 

 and engraver in the preparation of the plates of this volume. 



The single example upon which this genus is based (which is 

 flavous throughout, and impubescent) was sent home by the late 

 Mr. Squire from the neighbourhood of Rio Janeiro. 



