MADARUS. 
365 
occasionally (as in the Colombian Mf velatipes and WM. tarsalis, Kirsch) very hairy in 
this sex. The toothing of the femora, or at least of the anterior pair, is often a 
variable character, and more or less corresponds with the greater or less sulcature of 
their lower surface. ‘The elytra are uneven in many of the smaller glabrous forms. 
a. Prothorax and elytra glabrous. 
a’, Basal process of the prosternum angularly emarginate behind; elytra 
obsoletely striate-punctate or almost smooth ; femora clavate, unarmed 
(the anterior pair sometimes obsoletely dentate), not sulcate; body black. 
a’. Rostrum of ¢ longer than in 9, ciliate beneath ; antennal club elongate ; 
prosternum unimpressed in front; elytra spotted . . 
6°. Rostrum of ¢ not longer than in 2, bare; antennal club acuminate- 
ovate or ovate; elytra immaculate. 
a’, Prosternum with a single deep fovea in front; prothorax with a long 
basallobe . 2. 2. ew ee ee ee ee ee 
6°. Prosternum bifoveate or unimpressed in front ; prothorax with less 
produced basal lobe. . . . 1. 2. ee. ee. 
5‘. Basal process of the prosternum feebly notched, arcuate-emarginate, or 
truncate behind. 
c?, Prosternum bifoveate or unimpressed in front; elytra obsoletely or 
faintly striate; body black. 
c’. Anterior femora feebly dentate, the others obsoletely sulcate 
d°. Anterior femora unarmed. 
a‘. Femora not suleate, clavate . . 
6‘. Femora (the anterior pair excepted) sulcate, linear or clavate. 
d?, Prosternum broadly and shallowly sulcate anteriorly ; femora unarmed, 
sulcate ; elytra uneven, obsoletely striate on the disc ; body metallic 
e. Prosternum deeply sulcate to between the cox; femora obsoletely 
dentate or unarmed, more or less sulcate ; body black. 
. Elytra obsoletely striate on the disc . 
mn Elytra distinctly striate. . . . . . . . . 
b. Prothorax and elytra with patches of scales ; basal process of the prosternum 
ey emarginate or truncate behind. 
. Prosternum bifoveate or not in front; elytra striate. 
= 2 Femora, or at least the anterior pair, usually with a small tooth, more 
or less sulcate. 
g’. Elytra with an oblong or oval patch of scales at the base of the 3rd 
interstice . .... . . . . 
>, Elytra with a short narrow line of scales at ‘the base of the 3rd 
interstice . . 2. - + © © «© © © «© © « 
>. Elytra with an elongate line of scales running down the 38rd interstice. 
7°. Elytra with irregular confluent lines of scales, femoral tooth distinct . 
g’. Femora unarmed, linear, shallowly sulcate; elytra mottled and sub- 
bifasciate . 6 ee ee ee ee 
Species 1. 
Species 2, 3. 
Species 4. 
Species 5, 6. 
Species 7. 
Species 8, 9. 
Species 10. 
Species 11, 12. 
Species 13, 14. 
Species 15-18. 
Species 19. 
Species 20, 21. 
Species 22. 
Species 23. 
