[520) 



FIGURE 731. Macronema radiatum 

 McL. Detail of the punctate surface of 

 the head 



Anterior-margin rows of dense, dark, curved, setuliform hairs on 

 membranous part of labrum; posterior-angle tuft situated on a membranous 

 process, consisting of similar dark hairs; these hairs are longer, directed 



ventrally and forming a fan in live larvae; 

 Primary seta 1 situated in middle, indistinct; 

 seta 2 small and light; seta 3 relatively 

 large and brown; setae 6 situated lateral to 

 median pit, straight and relatively large; 

 setae 5 situated anterior to them, large. 



Mandibles massive, dark brown 

 (Figure 733), moderately long; ventral side 

 convex, dorsal side concave; upper, outer 

 margin of basal part projecting like 

 a wing; when mandibles are folded, this 

 margin forms a continuation of the dorsal 

 ridge. Upper blade of left mandible with a 

 large apical tooth; lower blade with 4 large 

 teeth in the apical part and 2 in the basal 

 part. Upper blade of right mandible with 

 1 blunt apical tooth, lower blade with 3 large 

 teeth in apical part and 1 in basal part. 

 Broad outer margin of mandibles with 

 numerous, short setae mainly in the part 

 contiguous with the upper margin; 2 primary 

 setae among them: 1 in middle of mandible 

 and the other further basally. 

 Submentum (Figure 735) brown, irregularly trapezoidal, with slightly 

 concave anterior margin; anterior and posterior angles rounded; 5 light, 

 519 thick, soft setae of different size (including a primary seta) laterally on 

 anterior part near margin; the 2 lateral setae of this group shorter and 

 thinner; 2 middle setae much longer than the others; medial seta curved 

 inward. Cardo slightly longer than submentum, yellowish brown, with a 

 dark brown basal margin; 8 or 9 thick, relatively long setae situated on 

 outer side; several, small, thin setae among them. Stipes pale, yellowish 

 brown at the outer margin and in the middle, with a basal group of long setae; 

 setae in apical group shorter and fewer; a membranous median tubercle 

 with a tuft of numerous thin setae. Palpifer long; the distal primary seta 

 longer; light, hairlike, dense setae in middle of membranous margin. 

 Second segment of maxillary palps shorter than 1st and 3rd segment; last 

 segment almost as long as 3rd segment. Galea narrow, adpressed to palp, 

 with relatively long setae and rods. 



Mentum dark brown; anterior margin with a small median indentation. 

 Labial palps situated at margin of labium. 



Pronotum (Figure 73 6, A) of characteristic form, short in the middle; 

 a narrow, dark margin laterally and posteriorly; distinct grayish spots in 

 a curved row in middle of each half; 3 small spots near posterior margin. 

 Sides of anterior margin with short, light setae; similar, but slightly longer, 

 setae laterally in anterior third; a long brown seta in the anterior angles; 

 3 setae (2 relatively long, brown setae and 1 short, light seta"between them) 

 in the middle of each half. 



520 



594 



