Stap hy I in IdcB of th c A m azo n Vti lley . 5 3 



world at large. Without therefore adopting Key's names, 

 I prefer to°point out that the first five species here de- 

 scribed are allied to our Myrmedonin Ilaioorthi, but are 

 remarkable by the great development of the spm-s at the 

 extremities of the tibia?. M. nitidula, on the other hand, 

 is very distinct on account of the basal joint of the inter- 

 mediate tarsus, which is only as long as the 2nd joint, 

 while the basal joint of the 'hind tarsus is only a Uttle 

 longer than the following one; and the spurs at the 

 extremity of the tibire are much less developed. It is only 

 when our knowledge of these insects is much more ad- 

 vanced than it is at ]n-esent, that we shall be able to point 

 out with something like certainty what Ave may hope will 

 prove stable generic characters. 



1. Afyrinedonia scabripennis, n. sp. Piceo-nigra, niti- 

 dula, antennarum basi, pedibusque pallidis, femoribus sub- 

 tus piceis ; prothorace subquadrato,_ inasquali, fortiter 

 punctato ; elytris dense scabrosis, opacis ; abdomine supra 

 concavo, h^vigato, subtus crebre subtiliter punctulato. 



Long. 4^ lin. . • • i 



Mas : abdomine segmento secundo dorsah spmis eloii- 

 gatis tribus armato ; seg. 6° utrinque obsolete longitudi- 

 naliter pllcato ; 7" asperato, medio obtuse angulatim 

 elevato. 

 Fem. latet. 



Antennre longer than the head and thorax; slender, 

 scarcely thickened towards the apex, pitchy, paler at the 

 base ; 3rd joint elongate, quite twice as long as the 2nd ; 

 4th shorter than 3rd, but considerably longer than the 

 5th ; 10th about as long as broad ; 11th pointed, twice as 

 long as the 10th. Head black, shining, strongly punc- 

 tured, with a narrow smooth space in the middle. Thorax 

 about as long as broad, scarcely narrowed behind, the 

 base rounded, the hind angles very obtuse, the front ones 

 deflexed and rounded ; very strongly and clpsely, but not 

 deeply, punctured, with a transverse impression in front of 

 the scutellum, and two irregular, not very distinct, smooth 

 spaces on each side near the front (placed one behind the 

 other); on each side it is broadly impressed at the sides 

 behind. The elytra are about as long as the thorax, 

 and nearly twice as broad ; more than twice as broad as 

 the head; black, not shining, densely scabrous. Hmd 

 bodv pitchy, shining, narrowed behind ; the margins large, 

 and much turned upwards; impunctate, and shining above; 



