sclerite, small, light and spinelike. Palpiger relatively long and brown; 

 distal seta light, situated on a membrane; mediobasal seta small; segments 

 of palps short, with narrow, brown sclerites; galea broad and short. Mentum 

 dark, blackish brown; ventral sclerites small; the light dots bear a short 

 seta; sclerites of labial palpiger curved; labial palps relatively large; 

 labium short. 



Pronotum large, chestnut brown (Figure 348), its anterior margin 

 projecting; lateral margin with a blackish brown spot where it is connected 

 with the pleuron; lateral margin concave anterior to the spot; a wide 

 process posterior to the spot; posterior margin of sclerite narrowly dark 

 300 brown; this border is divided laterally, passing around a light, elliptical 



broadening which bears large dots. Three yellowish brown, oblique dashes 

 with setae on each side. 



(301) 



FIGURES 345-347. Mystrophora altaica Mart.: 



345 - head, ventral; maxillolabium; 346 — labrum, dorsal; 347 - mandibles: left man- 

 dible, dorsal (A), right mandible, ventral (B). 



A thick, relatively long, primary anterior -angle seta is situated on a process 

 of the anterior angle, slightly away from the margin; one of the 3 secondary short 

 setae, situated at the angle, the other small, situated posterior to the former at 

 the margin; 3rd seta situated posterior to the primary seta; several additional 

 small light setae near the anterior angle. There are 3 laterally displaced, thick 

 setae which are as long as the anterior -angle seta at the anterior margin; 

 they are situated at the sides of the sclerite at an equal distance from each 

 other; middle of the anterior margin without setae; 4 small light setae 

 situated near the long anterior -margin setae and among them. The surface 

 setae form three groups, a median, intermediate and lateral group; the first 

 two groups are situated on the yellowish brown dashes. The first group 



326 



