BY VERA IRWIK-SMITH. 



235 



wards the tip of the tail, and tapering- to a point a little behind the posterior 

 extremity of the body proper; margin even, outlined by a double line (Text-fig. 

 8a). Bursa formed by the alae massive, broadly lanceolate, 2.5 mm. long in the 

 largest specimens, and 1.2 mm. wide from side to side. Cloaca! aperture large 

 and circular, with a prominent rim, opening in the centre of a cutieular pad 

 closely beset with rod-like processes or "knobs," the knobs arranged in radiating 

 rows continued over the margin of the cloaca into its interior, decreasing in size 

 on its inner folds. Radial aiTangement not so distinct at the sides of the cloaca, 

 but appearing again below it, the rows extending down the wings to the level 



-10. Physaloptera antarctica var. typica. 



7. 24 mm. male (x 5); 8a. Caudal extremity of the same specimen (x 32); 

 8b. Post-anal papillae (x 67); 8c. Caudal papillae (x 67); 9. Caudal extremity of 

 14 mm. male larva (x 32) ; 10. Caudal extremity of 43 mm. female (x 32). 



of the last of the caudal papillae. Behind the cloaca, tb.e surface of the tail is 

 covered with very small cutieular points, densely and irregnilarly arranged, ex- 

 tending just beyond the second of the caudal papillae. The peduncles of the 

 four pairs of external papillae, ensheathing the cloaca, are long and slender; the 

 second pair longest, reaching nearly to the margin of the wing's, the fourth pair 

 much shorter. In the largest male, 28 mm. long, they measure respectively -368, 

 .416, .336, .256 mm. Of the three sessile preanal papillae, the unpaired papilla 

 near the anterior border is small and inconspicuous, the paired papillae, 

 a little further forward, large and oval. The first pair of postanal papillae are 

 finger-like, situated on the margin of the cloaca and projecting over its rim; the. 

 second pair, a little further back and wider apart, broadly oval and sessile (Text- 

 fig. 8b). The three pairs of caudal papillae all possess fairly long peduncles, 

 and each at its distal extremity is surrounded by a large corona (Text-fig. Sc). 



