minute setule on a light alveole;- a black ridge in middle at base of 

 process; posterior part with similar ridges with one or several, large, 

 342 chestnut brown dots around yellow lateral spots, which is a specific character of 

 S.proximus; yellow spots with small light tubercles. Chaetotaxy sparse; 

 setae small, thin, as in S. pallipes. 



(341) 



FIGURE 582. Silo proximus Mart. Pronotum (A), mesonotum and meso- 

 pleuron (B) 



Tergites of mesonotum (Figure 582, B) different from those of 

 S. pallipes: median tergite with convex, lateral margin, lateral tergite with 

 slightly concave, median margin; anterior half of median tergite mainly dark 

 brown, with large tubercle bordered anteriorly by a black, curved ridge; 

 lateral margin and wide stripe behind dark area yellowish, stripe with 

 3 large, light dots surrounded by flat tubercles; similar tubercles near 

 anterior margin; posterior submarginal area with small, dark, flat tubercles 

 with a large, chestnut brown dot; posterior part with 4 small, spine -shaped 



This and other areas show the microstructure of dots which is present also on other thoracic and cephalic 

 sclerites of this species. The dots are not depressions but minute tubercles on a smooth surface. A similar, 

 but less distinct picture is present in S. pallipes. 



427 



