BY R. J. TILLYARD. 



399 



rapacity of the large Aeschnid nymphs, which are common along 

 the creek-borders earlier in the season, I have found that, in 

 this respect, the larva of Aeschna brevistyhi is the most to be 

 feared, as it often frequents old sticks and trash on the creek- 

 beds, and will even attack such large nymphs as those of Hemi- 

 cordulia tan and //. australice. 



The full-grown nymph of Conlulephya pycjnuea is, in outward 

 appearance, very similar to the nymph of llemicordidia ausfralicr, 

 tliough not so large. It is remarkable in possessing a labium 

 unlike that of any known larva, and one which shews, in a very 

 peculiar manner, both Cordulme and Lihelluline development. 

 The following is a full description. 



Total length, 14 mm.; Ibe.dd, 2 by 4 mm. wide; thorax 4 mm. 

 wide; ahdonifu 5 mm. wide at broadest part (segment G). Leys 

 (measurements for femur, tibia, and tarsus respectively) fore, 3-5, 

 3, 1-7 mm.; middle, 4-3, 4, 1-9 mm.; hind, 5, 4-2, 2-1 mm.(tliese 

 measurements coincide almost exactly with those for the imago). 



Head: triangular in front, with eyes placed at extreme antero- 

 lateral angles; post ocular areas fairly well rounded, with a con- 

 spicuous tuft of hairs on the outer margin; ocelli fairly conspi- 

 cuous; anteunce long, 3 mm., slender, 7-jointed, first two joints 

 shorter and thicker than the other five. Labi u m : mentuin 

 4 mm. wide, narrowing rapidly to 2 mm. at basal joint; median 

 lobe forming a very obtuse angle in middle; mental setce, 1 1 on 

 each side, longest about 1 mm., shortest 0-3 mm. Lateral lohest 

 subtriangular, strongly built, outer margin 3 mm., inner margin 

 2*5 mm.; lateral sette, 8, about 1 mm. long; terminal hook slender, 

 1 mm. Distal border with very remarkable indentations. 

 Beginning from the terminal hook, on one lobe (usually the left) 

 there is a small indentati(jn followed by three very deep and 

 narrow clefts, rounded at their bases, and isolating two long and 

 narrow projections or teeth, which are also well rounded at their 

 tips; the remainder of the border carries four much smaller 

 rounded teeth with shallow angulated depressions between them; 

 on the other lobe (usually the right), the first indentation is fairly 

 deep, then follow two very deep indentations or clefts of the same 

 shape as on the left, and next a fourth cleft only slightly deeper 



