146 Mr. D. Slia^^ Contributions to the 



solctcly punctured. The elytra arc a]>out as long as the 

 thorax, very dull, of a blackish colotu' with a slightly 

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

 pressed but distant punctures. The hind body is dis- 

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

 violet colour on the upper side, and is sparingly but dis- 

 tinctly punctured. The legs are blackish ; the basal joint 

 of the posterior tai'si as long as the three following to- 

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

 blackish colour iaintly tinged with violet ; the margins of 

 the thorax without stigmatic membrane. 

 Ega ; one specimen, <? . 



4. Trigonojisclaplius venuatns, n. sp. Violaceus, sat 

 nitidus, antennis nigris articulis nullis transversis. Long, 

 corp. 12 liu. 



Mas : abdomine segmento 6" ventrali apice medio leviter 

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

 levater emarginato. 



Closely allied in structure to Philonthus preiiosus, 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. Mandibles black, violet 

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

 rounded at the sides, on the upper side of a beautiful 

 violet colour, irregularly sprinkled with large punctures, 

 the central part being free. Thorax longer than broad, 

 much narrower 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 irregular dorsal row of 

 ten or eleven punctures on each side the middle, and 

 also Avitli other scattered punctures near the front. Scu- 

 tellum moderately closely and rather obsoletely punctured. 

 Elytra scarcely longer than the thorax, of a dai'k-violet 

 colour, rather finely and closely punctured. Hind body 

 distinctly narrowed to the extremity, of a greenish-violet 

 colour, rather sparingly and finely punctured, the i)unc- 

 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 2nd. 



Ega and Tapajos ; three specimens. 



