ERIC MJÖBERG, ISOPTERA. 17 



Head a little longer than broad, depressed on the summit 

 and in front, with an indistinct, median line, siightly rounded 

 at the sides, anterior and posterior angles rounded; clypeus 

 broad, yellowish white, impressed at each side, obtuse at 

 the anterior margin; labrum very characteristio, narrow at 

 the base, broader in the middle, broadly rounded at the 

 anterior angles, strongly convex, with a row of apical stiff 

 hairs; jaws black at the tip, lighter coloured at the base, 

 with a larger not -very sharp apical tooth and two more 

 obtuse ones further down; eyes very large, coarsely faceted, 

 very prominent; antennae ?-jointed, basal joint broad and 

 stout, 2nd smaller and shorter, 3rd darker coloured (strongly 

 chitinized) than the rest, 4th small, 5th and foUowing very 

 rounded, with long hairs; prothorax very broad and short, 

 more than twice as broad as long, about as broad as the 

 head; siightly emarginate at the anterior margin; all angles 

 rounded, with a fine median line and two small impressions 

 on each side before the middle ; meso- and metathorax smaller, 

 the former with a median black line on the anterior half 

 part; the scapular shield large and broad, sending out into 

 the wing membrane six strong free nervures, which con- 

 verge within the shield towards the base and are united into 

 three pairs; legs of normal type, femora thick, tibise short 

 and siightly bent, with tree spines at the apex; abdomen 

 flattened, rounded at the tip, richly hairy. 



Measurements: Length of body 10,5 mm, length of 

 head 2,6 mm, breadth of head 2,4 mm, length of prothorax 

 1,42 mm, breadth of prothorax 2,7 mm, breadth of abdomen 

 2,6 mm. 



Soldier (Plate 1, Fig. 5, Text Fig. 7). Body siender, with 

 parallel sides, head and base of jaws light rufous, tips of 

 jaws black. 



Head very long, with parallel sides, anterior angles 

 obtuse, hind angles rounded, flattened on the summit and 

 with a broad and deep furrow in the front, shining; clypeus 

 broad, with a median impression and a row of stiff hairs, 

 its apical part dull white, truncate in front, labrum of a very 

 characteristio shape, broadest at the base, the anterior angles 

 rounded, ending in a broad, more or less spade-like tip, the 

 upper surface siightly convex towards the middle, where it . 

 is distinctly bent down; its sides are siightly turned up and 



Arkiv för eoologi. Bd 12. N:o 15. 2 



