372 



GERALD F. HILL. 



Drepanotermes septentrionalis, sp. n. 



Ternies ruhriceps, Hill {;nec Frogg.), Proc. Linn. Soc. N.S.W., xl, pt. 1, 1915. 



Imago. — Head bay, clypeus argus brown ; labrum, palpi, antennae and legs 

 buckthorn brown, anteclypeus lighter ; thorax and abdominal tergites auburn ; 

 lower surface of abdomen uniform ochraceous tawny ; wings Brussels brown, faintly 

 tinged with yellow behind second vein. 



Head wide, rounded behind and on the sides, flat on the summit, moderately 

 hairy. Labrum moderately large, swollen on the sides, rounded in front. Ante- 

 clypeus yellow, membranous, shghtly pointed in front. Postclypeus convex, twice 

 as wide as long, with median suture very distinct. Eyes small, circular (0-376 dia- 

 meter), prominent. Ocelli broadly oval, widely separated from eyes. The small 

 deep impression between ocelli and clypeus pale-coloured. Fontanelle broadly oval, 

 about the size and shape of ocelli, with short indistinct forward extension, similar 

 to that of D. silvestrii, sp. n., but slightly larger. Antennae 18-jointed ; 1st segment 

 moderately long and wide ; 2nd half as long as 1st ; 3rd, 4th and 5th small and closely 

 fused ; 3rd and 4th equal to each other, and a little longer than 5th ; 6th longer 

 and wider than 5th. 



Thorax similar to that of D. silvestrii, but more rounded on the sides, similarly 

 clothed. Legs as in D. silvestrii. 



Fig. 6. Drepanotermes septentrionalis, sp. n., 

 wings of imago. 



Wings (fig. 6) with the margin ciUate ; membrane with many hairs, subcosta 

 very short, hardly extending beyond suture, costa and radius well separated, the 

 latter very dark and connected with the former near the apex of the wing by a few 

 indistinct nervures ; median of the fore-wing branching from the radius within the 

 wing-sturnp, that of the hind-wing just beyond suture, nearer to cubitus than to radius ; 

 branches of the median and cubitus very irregular and not alike in either fore- or 

 hind-wing. 



Abdomen elongate, nearly cylindrical, moderately densely clothed with short 

 reddish hairs ; ten dorsal and six ventral plates distinctly visible. Cerci as in 

 D. silvestrii. 



Measurements: Length w^ith wings, 15; length without wings, 8; head, with 

 mandibles, 2-06 long ; head, at and including eyes, 1-78 wide ; prothorax, 1 -03 long, 

 1-22 wide; fore-wings, 13 long, 3-25 wide; hind- wings, 12-5 long, 3-5 wide; 

 abdomen, 1 -73-1 -92 wide. 



Soldier. — Very like D. silvestrii, sp. n., from which it differs in having the labrum 

 larger and more rounded at the apex, clypeus shorter and less strongly lobed, antennae 

 (fig. 7) of the same number of joints, i.e., 17 or 18, but the size and shape of the basal 

 joints very distinctly different, viz., in D. septentrionalis the 1st joint is shorter and 

 wider, the 2nd shorter and narrower, the 3rd and 4th very short, together equal 



