DASYDACTYLUS. 15 



The species which I here unite have also a clear affinity with Trapezidera cenea ; the 

 prosternum differing only in having its apex more depressed, and therefore not flat but 

 arcuate, and in some species the apex excised but not deeply. 



The great difference consists in the sexual characters : the males having hairy and 

 strongly dilated tarsi and roughened femora and tibiae to both the front and middle 

 pairs of legs ; while the head here is uniform in both sexes, whereas in Goniolanguria 

 the left side is asymmetrically swollen. I have not seen specimens of any species 

 except from North and South America thus characterized ; they seem to be closely 

 allied, and locally restricted, and must be numerous. 



Section A. Processu prosternali apice truncato. 



1. Dasydactylus buprestoides. (Tab. I. fig. 7, d .) 



iEneus ; antennis breviusculis, nigris ; capite fortius, prothorace subtilius, punctatis, crebre alutaceis ; elytris 

 subtiliter punctatis, vix striatis, apice oblique truncatis et denticulatis ; abdomine piceo, lateribus 

 dilutioribus ; tarsis nigris. Long. 16 millim. S 2 • 



Mas protborace convexiore, postice latiore ; femoribus tibiisque anticis et intermediis intus asperatis. 



Hab. Mexico, Cordova {Hoge). 



The head and thorax in this species are rather thickly and strongly punctured, and 

 their entire surface is finely alutaceous (a character by which the female of this insect 

 may be known from a Trapezidera also occurring at Cordova) ; the reflexed edge of the 

 latter is obliquely and finely wrinkled. The prosternum is rugulose ; the process 

 nearly smooth, with a double fossa near its apex, its apex truncate. The thorax of 

 the male is very convex in front, and wider than the elytra ; that of the female trape- 

 ziform, and hardly so wide at its base as the elytra ; the base is very finely margined, 

 with the basal striola only just indicated by a punctiform impression. The elytra 

 taper very gradually but decidedly ; their apex is obliquely truncate, though somewhat 

 rounded in the females, and denticulate ; their punctuation fine and close and confused, 

 the striae being hardly defined ; here and there the punctures form series. The under- 

 side is smooth (excepting the mesosternum) ; the apical segment of the male faintly 

 carinate, and obsoletely punctate and ciliate, that of the female very similar. The 

 general colour is brassy, the antennae being bluish-black. 



But few specimens of this species were collected by Herr Hoge. The females so 

 strongly resemble that sex of a form of Trapezidera cenea, that T. buprestoides may 

 easily have been overlooked as distinct from that insect. The males have much longer 

 legs, of which the two front pairs have strongly roughened femora and tibiae ; even the 

 femora of the hind pair in this species are a little roughened. 



2. Dasydactylus subulatus. (Tab. I. fig. 13, <$ .) 



Kufo-piceus, supra viridi-nitens, elytris viridibus, ant ennis tarsisque nigris ; capite prothoraceque fere glabris 



