StaphyliaidcB of the Amazon Valley. 1-45 



tarsi moderately long, tlielr basal joint rather longer than 

 the three following together. 



Pebas; a single female, collected by Mr. Hauxweil.^ 



Obs. This is a very remarkable species, and one which 



has at first sight the facies of the Xantkopygi ^\ath 

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

 stigmatic iiiembrane 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 Trigonopselaphus, 

 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. Trigonopselophus violaceus, n. sp. Violaceus, 

 opacus, antennis pedibusque nigris, elytris sparsim fortiter 

 punctatis. Long. corp. 9 lin. ^ 



Mas: tarsis anticis sat dilatatis, abdomme segmento b 

 ventrali apice medio leviter emarginato, T late minus 

 profunde inciso. , 



N.B.— Hac specie palpi labiales articulum ultimum 

 baud dilatatum, apice truncatum pr^bent; tarsi postici 

 articulum primum elongatum, ceteros breves. 



Antennge 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 bi-oad; 11th 

 ioint rather longer than the 10th. Mandibles black; 

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

 precedincT 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 Iront 

 angles, so that it is scarcely broader at the front 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 Iront 

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



TP.AXS. ENT. SOC. 1876.— PART I. (mAY.) L 



