224 ENuBRIK STRAND, 
corresponding almost exactly with that of bonariensis except in the 
absence of yellow spots on the seventh abdominal segment, which 
I think may safely be associated with the smaller females resembling 
agilis. It is easily distinguished from cuyana by the position of the 
recurrent nervures noticed by BURMEISTErR and the much narrower 
slit for the aculeus in the seventh dorsal segment. If Smite is 
correct in associating the sexes of agzlis the name must sink as a 
synonym of cuyana. If on the other hand he was mistaken, as 
I think probable, and agilis 2 is only a large variety of the common 
species, it might stand as Plesia bonariensis st. agihs. From the 
colleetion mentioned I have seen many of both sexes of the species 
referred to, also of both sexes of P. albosignata Burm., a few males 
of P. cuyana and females of P. andina Turn. The two latter may 
possibly prove to be sexes of the same species. The type specimens 
of agilis in the British Museum were received from E. Rren, but 
there is no note on them to show that they were taken in copula. 
P. elegans Burm., which I have not seen, appears from the description 
to be very near bonariensis; if they prove to differ only in the colour 
of the wings, the name bonariensis would have to be used as a sub- 
specifie name only, elegans having priority. 
Pterombrus elavicornis DUuckE. 
Hüberia elavicornıs DUCKE, in: Revue d’Entomologie 1907. 
Plerombrus clavicornis DUCKE, ibid., 1908. 
9. Mandibles bidentate, the inner tooth short; the elypeus ad- 
vanced in the middle and truncate at the apex. Head longer than 
broad, longitudinally and finely rugose, the interantennal prominence 
bituberculate; eyes slightly convergent towards the vertex. Pronotum 
narrower than the head, narrowed anteriorly, much longer than the 
breadth on the anterior margin, strongly arched on the posterior 
margin, finely punctured-rugose with a fine sulcus from the anterior 
margin tothe middle; mesonotum sculptured like the pronotum, scarce- 
ly more than half as long as the pronotum; mesopleurae very 
closely and minutely punctured. 
Seutellum shining, very sparsely punetured, narrowly rounded 
at the apex; median segment much longer than broad, rounded at 
the apex, not truncate, very coarsely reticulate, as long as the pro- 
and mesonotum combined. Abdomen slender, smooth and shining; 
the first segment nearly half as long again as the second, the basal 
