setae reddish brown, thick, latter moderately long, almost twice as long as 

 former; setae 14 and 15 shorter and thinner than in S. pallipes. 



FIGURE 581. Silo proximus Mart. Head, dorsal 



341 Labrum lighter than head; dorsal sclerite light brownish, with a deep, 

 median indentation at anterior margin; membranous anterior-angle lobes 

 large; groove at posterior margin with a small, dark reddish brown stripe. 

 Setae 1, 2, and 4 as in S. pal lip e s; setae 5 and 6 reddish brown, situated 

 before median pit, closer to anterior margin; seta 3 yellowish, situated 

 near margin at anterior angle. Mandibles as in S. pallipes. Longitudinal, 

 paired sclerites of submentum light brown, setae moderately long, brown; 

 single posterior sclerite thin, indistinct, yellowish white. Dark lateral spot 

 of stipes dark reddish brown, smaller than in S. pallipes. 



Pronotum (Figure 582, A) mainly dark reddish brown, darker than in 

 S. pall ipe s, blackish laterally; yellow spots less numerous; median spot 

 in form of a longitudinal stripe; wider anteriorly, with 2 pairs of reddish 

 brown dots at suture; lateral spots in posterior part smaller than median 

 spot; anterior-angle processes as in S. pallipes; anterior margin 

 extending to end of process, brown; yellow stripe behind margin absent; 

 anterior part rough between processes, with fused tubercles, each with a 



426 



