of the Royal Physical Society. 297 



robustis, non dentatis; labro integro; thorace marginato, 

 angulis posticis fere rectis sine emarginatione ; elytris, capite 

 et thorace paulo longioribus, parallelis, cum carina marginali 

 interrupta et fortius plicata versus apicem; femoribus non 

 dentatis, tibiis anterioribus arcuatis, intus fortiter emarginatis. 

 Long. 5 lin., lat. \\ lin. 



Colour uniform chestnut; shining, smooth. Head faintly, 

 acicularly, irregularly punctate in front, and still more sparingly 

 behind, with the vertex raised and impunctate; clypeus solid 

 and smooth, outline in front very slightly concave; labrum 

 transverse, and almost as broad in front as behind, entire*, 

 a row of punctures, from which hairs proceed, extending along 

 the front; mentum with a tooth in the middle; ligula short, 

 narrow, truncate ; paraglossse broad, truncate, adhering to the 

 ligula throughout their length ; labial palpi short and robust, last 

 joint somewhat securiform; maxillary palpi longer, last joint 

 subcylindric, depressed, and truncate; mandibles robust, elon- 

 gate, and rounded in front, a few scattered hairs along their ex- 

 terior, without teeth on the interior margin ; antennae about 

 as long as the head and thorax, flattened, gradually increasing 

 in size to the end, the last joint more than twice as long as 

 the preceding. Thorax as long as broad, cordiform, surrounded 

 with a border along the sides, flat anteriorly, but broader and 

 reflexed behind, ending in a fovea near the basal angles, 

 which are nearly right-angled; no emargination in front of 

 them; dorsal line not reaching quite to the front; a curved 

 line in front, and a transverse line a little before the base, 

 which is truncate and almost straight. Elytra elongate and 

 nearly parallel, with a reflexed margin or raised keel running 

 along the exterior sides to near the extremity, where it termi- 

 nates, and then another keel commences a little within it, with 

 a more prominent fold, which continues for a very short space, 

 and is then replaced by an ordinary raised margin, which dis- 

 appears near the apex ; an inner raised callosity or rounded ridge 

 commences near the above fold, and continues parallel to it and 

 the raised margin nearly to the apex, where it joins it, and both 

 cease ; under a powerful lens, the elytra are seen to be sparingly 



* The labrum can hardly be called emarginate, although perhaps the 

 anterior angles may be said to be very slightly more advanced than the 

 centre of the anterior margin ; still the line of margin is very nearly straight. 

 A similar slight inequality would perhaps explain how the figure published 

 by Gray of his G. Brasiliensis shows an emarginate labrum, while he makes 

 no mention of its emargination in the text, and would confirm the view 

 taken by Lacordaire, that the genus Ictinus of Castelnau (which has the 

 labrum entire) is identical with the Goniotropis of Gray, notwithstanding 

 this apparent discordance in their characters. 



