FIGURES 554-556. Drusus discolor Ramb : 



554 — left legs, anterior: foreleg (A) , mid-femiir (B), and hind femur, tibia, tarsus, and claw(C); 555— tergite 

 of abdominal segment 9; 556 — left anal leg, lateral. 



in a characteristic pattern at margins (Figure 551, A). Flattened dorsal 

 317 part of head surrounded by a ridge, especially near eyes. A crown of 

 numerous, thin, dense, light, secondary setae along and behind ridge; 

 setae 9 and 14 dark, thick, moderately long, distinct among secondary setae; 

 seta 15 thin, moderately long, situated behind 14; other primary setae little 

 visible among secondary setae. Ventral surface lighter, without pattern; 

 seta 8 light, relatively large, situated near ventral articulation of mandibles; 

 seta 18 small (Figure 551, B). 



Labrum with dark brown dorsal sclerite; median indentation shallow; seta 1 

 small, light, situated on each side in indentation; seta 2 situated laterally, 

 curved, light; seta 3 on lateral margin; seta 4 situated near anterior margin; 

 setae 5 and 6 situated slightly posteriorly lateral to median indentation 

 (Figure 551, C). 



Mandibles black, chisel- shaped, with 3 small, blunt teeth; chaetoids of 

 median brush light, larger basally; lateral setae short, of about equal length. 



Sclerites of cardo yellowish, with brown median and lateral dots; both setae 

 small, dark. Submentum with2 sclerites, brown, relatively large, separated by 

 a membranous stripe; a short seta at anterior miargin of each sclerite. Stipes 

 wide, brown; basal seta short, light, apical seta smaller. Palpifer and sclerites 

 of palp brown; distal seta of palpifer situated at anterior margin. Galea shorter 

 than palp, with large sensillae; segments of palps of similar length; segment 4 

 slightly shorter than the others; segment 3 larger. Mentum in formof a short, 

 reddish brown semicircle with a darker transverse stripe. Ventral sclerites 

 brown, with a small, light seta. Palpiger sickle-shaped, light brown. Labial 

 palps relatively large, reaching end of labial lobe. 



Pronotum (Figure 552, A) brown, with a transverse, humplike process in 

 middle, more visible in lateral view, and densely covered with secondary, 

 319 light setae similar in color and density to those on head. Primary setae 



400 



