146 I\Ir. D. Sharp's Contributiuns to the 



soletely punctured. The olyti-a are al)out as long as the 

 thorax, very dull, of a blackish colour Avith a slightly 

 violet tinge, covered -with rather large and deeply im- 

 pressed but distant punctin-es. The hind body is dis- 

 tinctly narrowed towards the extremity; it is of a dull- 

 violet colour on the u])pcr side, and is sparingly but dis- 

 tinctly punctured. The legs are blackish ; the basal joint 

 of the posterior tarsi as long as the three following to- 

 gether. The under surface of the insect is of a dull- 

 blackish colour fiiintly tinged with violet ; the margins of 

 the thorax without stigmatic membrane. 

 Ega ; one specimen, <J . 



4. Trigonnpselaphus venuslus, n. sp. Violaceus, sat 

 nitidus, antennis nigris articulis nullis transversis. Long, 

 corp. 12 lin. 



]\Ias : abdomine segmento 6" ventrali apice medio leviter 

 emarginato, 7" minus profunde exciso, 8° lobo medio apice 

 leviter emarginato. 



Closely allied in structure to PJuloiithus pretiosics, Er., 

 and belonging really to the same genus. Antenna? not quite 

 so long as the head and thorax, not thickened towards the 

 apex ; 2nd joint long, but shorter than the 3rd ; 4th joint 

 twice as long as broad, 10th longer than broad, 11th 

 rather longer than 10th, pointed on one side; they are 

 black, Avith the basal joints violet. jNIandibles black, violet 

 at the base. Head a little narrower than the thorax, not 

 rounded at the sides, on the uj^per side of a beautiful 

 violet colour, irregularly sprinkled with large punctures, 

 the central ])art bc'ing free. Thorax longer than broad, 

 jnuch luu-rower than the elytra, the sides a little narrowed 

 at the front and sinuate behind the middle; above similar 

 in colour to the head, and with an irn'gular dorsal row of 

 ten or eleven jnuictures on each siele the middle, and 

 also with other scattered j)unctures near the front. Scu- 

 tellum moderately closely and rather obsoletely ])unctured. 

 Elytra scarcely longer than the thorax, of a dark-violet 

 colour, rather finely and closely ])unctured. Hind body 

 distinctly narrowed to the extremity, of a greenish-violet 

 colour, rather sparingly and finely punctured, the punc- 

 tures evenly distributed. Legs greenish-violet ; the front 

 tarsi dilated in both sexes, the basal joint of the hind 

 tarsus not greatly longer than the 2iul. 



I'^ga and 'I'apajos ; three specimens. 



