slightly larger than others. Mentum in form of a narrow semicircle. 

 V'entral sclerites with a small distal seta. Sclerites of palpiger forming 

 narrow^ sclerotized bands. Labial palps small, with a single segment. 



315, 



5«5 



545 



550 



FIGURES 548-550. Drusus tri fi d us McL. (after Fotius-Jaboulet): 



548 — head, dorsal (A) and lateral (B); 549 — mesonotum and metanotum (A), 

 head, thorax and abdominal segment 1, lateral (B); 550 - left fore femur, 

 posterior. 



Pronotum dark, with black lateral and posterior margin, surface with 

 numerous, small, yellow spinules and black setae, including several 

 moderately long setae. Mesonotum brownish at posterior angles and in 

 anterior part, darker elsewhere, with broad, black, lateral and posterior 

 margin; a light spot at posterior angle; lighter area of posterior angles 

 without setae; setae sparse in middle of anterior part, numerous on other 

 parts, black, strong, of different size. Anterior-median tergites of meta- 

 thorax situated close together, transverse; setae short, strong, situated in 



397 



