StapltyUnidcc of tlie Amazon Valley, 189 



this latter red at the extreme base ; joints 4 — 10 strongly 

 transverse, scarcely differing- in length. Mandibles about 

 half as long as the head. Head slightly narrower than 

 the thorax, considerably longer than broad, oblong, the 

 hind angles much rounded, but the sides straight; above 

 })lack, and quite dull, with a very faint brassy tinge, ex- 

 tremely densely and finely rugulose-punclate, with a very 

 dense, short and fine erect pubescence ; lateral grooves 

 broad, shallow and densely punctured, these limited on 

 the imderside by a smooth, rather eleva,tcd line, the rest 

 of the under surface coarsely and nuinerously pimctured ; 

 2)unctuation at the hinder part fine and dense, passing 

 gradually into that of the upper surface. Thorax about 

 two-thirds of the width of the elytra ; its length quite one 

 and a half times its width, slightly broader from the base 

 to a little in front of the middle, thence much narroAved 

 and rounded to the front, extremely densely and finely 

 punctured, with an extremely short and fine, erect pubes- 

 cence, quite dull, with a middle line smooth, shining and 

 impunctate ; it is also slightly transversely impressed some 

 distance in front of the base, and in this transverse impres- 

 sion the smooth middle line is very nearly interrupted ; it 

 is similar in colour to the head. Elytra with their greatest 

 length (z. f., measured from the humeral angle to the outer 

 apical angle) just equal to that of the thorax, extremely 

 densely and finely punctured and pubescent, opaque black. 

 Hind body rather shining, brassy black, extremely finely 

 and rather closely punctured, and delicately pubescent. 

 Legs blackish, the tarsi pitchy ; the inside of the tibire 

 with a dense-grey pubescence. 



Ega ; four specimens; sex unknoAvn. 



Ohs. — This species is clearly closely allied to *S'. formi- 

 caria, Er., but contradicts his description in several im- 

 portant points. S.formicaria was originally described by 

 Laporte, but his description and figure are quite Avorthless, 

 and it is impossible to decide Avhethcr they relate to Erich- 

 son's species or not. Erichson places as synonyms of 

 S.formicaria, i\\Q Jlagellicornis and puhescens of Nord- 

 mann ; these tAVO descriptions are very carefully draAvn up 

 by Nordmann, and it appears to me clear that they refer 

 to tAvo distinct species, and are erroneously united by 

 Erichson under the name oi formicaria. Hence I con- 

 sider the w^vciQ formicaria should be entirely drojiped, and 

 ^ovdmnxwx s Jlar/eUicorjiis be used instead, leaving it to a 

 comparison of the types (in the Museum at Berlin, sec. 



