Mandibles (Figure 598) slightly curved, flattened; left mandible larger 

 than the right, with a deep median depression and a long, pointed, terminal 



423 tooth; upper blade with 3 teeth; middle tooth of this group larger than the 

 others; lower blade with 2 teeth; basal tooth larger; median depression 

 with a brush of long hairs. Lower blade of right mandible with 2 teeth; 

 upper blade with one tooth; a small denticle at the base of this tooth. Outer 

 setae almost straight, of the same length, situated near the basal margin; 



Maxillolabium (Figure 596, C) broad in the middle of the basal part; 

 narrower in the apical part. Submentum with projecting anterior angles; 

 setae near them strong and spinelike. Cardo irregularly quadrangular, 



424 with a small, posterobasal process; seta of sclerite small and thin. Stipes 

 oblong-triangular, with dark median margin; both setae of stipes situated 

 near the sclerite, on a membrane. Palpifer broad at the base, narrower 

 apically; basal seta very small, situated on a sclerite; apical seta 

 relatively long, situated on a membrane. Galea long and narrow, slightly 

 conical (Figure 599), with a closed continuous sclerite; 2 setae near the base 

 of the sclerite, one of them strong, relatively long; galea with 3 shorter 

 setae and 2 thin apical setae; membranous apex with 5 sensillae. Palp long, 

 thin; sclerites of segments annular; first two segments small and short; 

 4th segment narrower, slightly longer; 3rd segment longer than all the 

 others together; apex of 4th segment with relatively large sensillae in a 

 dense group (Figure 600); some of them two-segmented. Mentum light 

 yellow, relatively large, with a median process at the anterior margin 

 (Figure 601 ); ventral sclerites of labial palpifer with a broad basal part 



and a long apical part; a thin seta more medially. Labial palps well 

 marked, with relatively long sensillae and a brush of hairs. 



Pronotum (Figure 59 6, B) mainly yellow, brownish near the posterior 

 angles, near the ventral process; posterior margin of sclerite separated by 

 a transverse groove and broadly black dorsoventrally narrower (Figure 602). 

 Dots large, dark, 2 or 3 dots along the median suture and on the sides of the 

 sclerite (on the dark transverse stripe and posterior to it in a curved row); 

 isolated dots near the anterior angles. Number of setae of pronotum given 

 in Table 10. Three longer and thick setae stand out among the numerous 

 setae of different length at the anterior margin; they are situated slightly 

 away from the anterior margin; seta closest to anterior angle longer and 

 darker than the others; anterior angle with a long, thick seta; a shorter 

 seta near the black lateral margin, near the anterior -angle seta small setae 

 at the margin between it and the thick lateral seta. Each half of sclerite 

 with 2 long primary setae, one near the median suture and one lateral seta 

 among the dots, in about the middle of the half of the segment; a pit and 

 2 short setae between the above setae, near the former seta, other setae thir 

 situated near the primary setae; isolated setae situated in the anterior half 

 of the sclerite. Number of setae of prothorax, legs and abdomen are given 

 in Table 10 (after Nielsen). 



Mesothorax (Figure 603) larger than metathorax; both segments with a 

 complex light pattern; two longitudinal white punctate stripes stand out on 

 the dorsum, and also a transverse stripe, which is interrupted in the middle 

 posterior to the segment. Anterior -margin setae well marked, shorter on 

 the metathorax than on the mesothorax; anterior -angle and medioanal setae 

 long, about as long as the segment; intermediate and lateral setae situated 

 near the medioanal setae, small; near a small secondary seta near the 

 anterior-angle seta. 



478 



