Staphyllnidce of the Amazoji Valley . 145 



tarsi moderately long, their basal joint rather longer than 

 the three following together. 



Pebas; a single female, collected by Mr. Hauxwell. 



055.— This is a very remarkable species, and one which 

 has at first sight the facies of the Xanthopygi Avith 

 metallic elytra; but the labial palpi, and the absence of a 

 stigmatic membrane to the thorax, forbid its being asso- 

 ciated with them. I have thus been compelled either to 

 establish a new genus for it, or to call it a Trigono})selaphus, 

 and I have preferred the latter course, as that name has 

 already scarcely any definite meaning, owing to the hetero- 

 geneous nature of the few species associated under it. 



3. Trigonojiselaphus violaceus, n. sp. Violaceus, 

 opacus, antennis pedibusque nigris, elytris sparsim fortiter 

 pimctatis. Long. corp. 9 lin. 



Mas: tarsis anticis sat dilatatis, abdomine segmento 6" 

 ventrali apice medio leviter emarginato, 7° late minus 

 profunde inciso. 



N.B. — Hac specie palpi labiales articulum ultimum 

 hand dilatatum, apice truncatum prtebent; tarsi postici 

 articulum primum elongatum, ceteros breves. 



Antennse nearly as long as head and thorax, rather 

 slender, not in the least thickened towards the extremity; 

 they are blackish, the three basal joints indistinctly violet; 

 3rd joint long, one and a half times the length of the 2nd, 

 4th not quite so long as 2nd ; from 5 — 10 each is a little 

 shorter than its predecessor, the first of them much longer 

 than broad, and even the last longer than broad; 11th 

 joint rather longer than the 10th. Mandibles black; 

 palpi pitchy, last joint of the maxillary twdce as long as the 

 preceding one. Head rather narrower than the thorax, 

 a little narrowed to the front ; the eyes moderately large, 

 extending quite half-way to the back of the head ; above 

 it is of a beautiful dull-violet colour, and has a few large 

 punctures scattered irregularly over it. The thorax is 

 considerably longer than broad, the sides slightly sinuate 

 behind the middle, and a little narrowed towards the front 

 angles, so that it is scarcely broader at the fi-ont than at 

 the hind angles ; it is similar in colour to the head, and 

 has two lines formed of three or four indistinct punctures 

 along the middle, and a few^ other punctures near the front 

 part. The scutellum is large, blackish, sparingly and ob- 



TRAXS. ENT. SOC. 187G. — PART I. (:\rAY.) L 



