Stcqiliylinidce of the Amazon Valley. 201 



lengtli, lOtli considerably broader than the 4th; 11th 

 joint yellowish at the extremity, obtusely pointed. Palpi 

 yellowish ; mandibles rather long and slender at the ex- 

 tremity. Head as broad as the thorax, much narrowed 

 in front, the hind angles rounded, with an elongate oblique 

 punctiu'e on each side between the eyes, a similar one 

 behind tlic eye, and one or two other punctures near the 

 back ; otherAvise impunctate, very shining, and of a beau- 

 tiful violet-blue colour. Thorax a little narrower than 

 the elytra, longer than broad, straight at the sides, similar 

 in colour to the head, very shining, Avith three or four 

 coarse punctures on each side close to the front; otherAvise 

 impunctate. Scutellum Avith three or four punctures. 

 Elytra shining dark blue, quite as long as the thorax, 

 sparingly but rather coarsely piuictured. Hind body 

 shining black, the hind margin of the 6th and the whole 

 of the 7th segment bright yelloAv, very sparingly punc- 

 tured. Legs and prosternuni pitchy. 

 Ega ; one specimen. 



6. Xantlwlbras temporalis, n. sp. Niger, nitidus, 



capite thoraceque violaceis, eh'tris nigro-cyaneis, ano 



flavo ; thorace ad angulos anteriores parce punctate. 

 Long. Corp. 7^ lin. 



This insect is peculiar by the very thick hind part of 

 the head and by a peculiar form of the mandibles. An- 

 tenna3 rather longer than the head, nearly black; 3rd joint 

 nearly twice as long as the 2nd; joints 4 — 10 transverse, 

 scarcely differing in length, but the 10th broader than the 

 4th ; 11th joint obtusely pointed, yelloAV at the extremity. 

 Palpi slender and elongate, yelloAvish. Mandibles pitchy 

 black, elongate, the lelt one longer than the right and 

 much curved toAvards the extremity, and near the ex- 

 tremity sinuate or emarginate on the upper edge. Head 

 large, broader than the thorax, narroAved in front, the hind 

 angles rounded, the up})er surface rather uneven, a pimc- 

 ture on each side betAveen the eyes, a fcAv others on each 

 side near the hind angle and back margin, and behind the 

 eye Avith a curved broad impression ; it is of a shining 

 violet-blue colour, on the under surface but little shining, 

 and there Avith shalloAV longitudinally subrugose sculpture. 

 Thorax scarcely narroAver than the elytra, rather longer 

 than broad, slightly narroAved behind, similar in colour to 

 the head, impvuictate Avith the exception of five or six 



