StaplnjlinidcR of the Amazon Valley. 233 



dense puiictato, medio puree fortius punctato ; protliorace 

 creln'e fortiter punctato, linea media kevi. Long. corp. 

 4ilin. 



jNIas : abdomine segmento 7° ventrali apice profunde 

 excise ; sexto medio longitudinaliter impresso, 5" obsolete 

 impresso. 



Katlier broader and more parallel than L. rjeyninum. 

 Closely allied to L. opalescens, but slightly narrower, and 

 the male characters different. The antennae are reddish- 

 yellow, long and slender, rather longer than head and 

 thorax ; the 3rd joint longer than the 2nd ; the penultimate 

 joints shorter than the intermediate ones. The head is as 

 broad as the thorax, pitchy, dull, the sides and back part 

 very densely and finely punctured, the middle and front 

 part sparingly and more coarsely punctured. The thorax 

 is quadrate, about as broad as the elytra, straight at the 

 sides, quite as long as broad, the whole of the sides rather 

 coarsely and closely punctured, a line along the middle 

 smooth ; it is of a reddish colour and rather shining. The 

 elytra are rather longer than the thorax, reddish, mode- 

 rately closely punctured. The hind body is reddish, 

 closely and finely punctured. The legs are yellow. 



Tapajos ; numerous specimens. 



This species is so closely allied to the two preceding 

 that it is scarcely distinguishable from them except by the 

 sexual characters. The male has a rather deep and narrow 

 notch, not contracted at the entrance, on the hind margin 

 of the 7th segment; the 6th segment has a distinct but ill- 

 defined longitudinal impression along the middle, and 

 there are indications of a very slight depression on the 5th 

 segment, the sides of this having, in fresh specimens, some 

 rough black pile, which appears very easily removed. 

 The female has the hind margin of the 7th ventral seg- 

 ment rounded and entire, and the dorsal lobe of the 8tli 

 short, and only very slightly laterally compressed towards 

 the apex. 



5. Lathrohlum j^arallelum, n. sp. Piceum, nitidum, 

 antenuis pedibusque rufo-testaceis ; capite dense subtillter 

 punctato, disco hcvi, fronte parce fortiter punctatii; pro- 

 tliorace crebre sat fortiter punctato, linea media im- 

 punctata. Long. corp. 4 lin. 



Mas : abdomine segmento 7° ventrali apice ]irofunde 

 exciso, segmento 6° late profundeque longitudinaliter 

 impresso, ad impressionis apicem exciso. 



