292 'Mv. D. Shai-p'.s Cuntrlhntions to f/tr 



Extremely closely allied to S. amicus, but readily dis- 

 tinguished by the colour of the elytra, each of which has 

 the outside occupied by a large black patch, which does 

 not t[uite reach the apex ; the suture also very narroAvly 

 blackish, the space between these black marks, as well as 

 the apex, yellow. It is also rather more slender than 

 S. amicus, and the male characters are diflerent. 



In the male the ventral plate of the 6th segment of the 

 hind body has a broad longitudinal impression on the 

 middle, its hind margin being quite simple ; the hinder 

 ])art of the ventral i)late of the next segment bears a 

 rather deep excision. 



Tapajos ; three males, two females. 



3. Snnius serpens, n. sp. Angustus, testaceus, elytris 

 macula media abdomincque segmento 6° fuscis; dense 

 punctatus, opacus; abdomine apiccm versus latiore. Long. 

 Corp. 1| lin. 



Antenna? not quite as long as head and thorax, pale 

 yellow; 1st joint hardly longer than 3rd; 3rd much longer 

 than 2nd, 4 — 6 differing little from one another; 7 — 10 

 each slightly shorter and scarcely broader than its pre- 

 decessor, 11th distinctly thicker than 10th. Head 

 broader than thorax, quite as broad as elytra, yellowish 

 in colour, very densely and indistinctly punctured, dull ; 

 the punctures very shallow, the interstices very fine ; eyes 

 large, placed at the middle of the sides. Thorax longer 

 than broad, a little narroAver than the elytra, almost oval, 

 the sides much narrowed behind ; colour and sculpture 

 similar to those of the head. Elytra narrow, rather longer 

 than the thoi'ax ; rather paler in colour than the other 

 ])arts, each Avith a dark oval spot on the middle nearer to 

 the apex than to the base ; rather coarsely but indistinctly 

 and not densely punctured, not so dull as the other parts. 

 Hind body elongate, very naiTOw at the base, broader 

 towards the extremity, yellowish ; the 6th segment blackish 

 except at the extremity, quite dull, densely and finely 

 punctured, with a very fine dense pubescence. Legs very 

 pale. 



The male has a rather deep excision at the extremity of 

 tlie ventral plate of the 7th segment of the hind body. 



Tapajos ; numerous examples. 



Obs. — This species greatly resembles the European 

 S. himaculatus, but is rather more slenderly formed, is of 



