BY K. J. TILLYAIID. 265 



Seasonal Range of Imago. — My first two exuviae 

 were found on November 21st, 1908; and new ones continued to 

 be found up to December 12th. On December 5th, two males 

 were found just emerging. On December 17th, no new exuviae 

 were obtained, and many of the imagines were considerably torn 

 and aged. I have never seen this species during visits to 

 Katoomba in early February. Hence its seasonal range is 

 certainly a very short one, extending from the third week in 

 November to about the end of January at the very latest. It is 

 doubtful if many imagines would be found even in January. 



Hah. — Blue Mountains and their southern and coastal spurs, 

 N. S.W. 



The Petalurince are, at the present time, only a remnant of a 

 race long past its prime. Included in the subfamily are four 

 genera : Petalura (Australia), Uropetala (New Zealand), Phenes 

 (Chili), and Tachopteryx (N. America). A single female exuviae 

 of the latter has been described by Williamson (Entomological 

 News, 1901, 12, 1-3, PI. i.). A diagram of the labium and an 

 antenna is inserted here for purposes of comparison. It will 



be seen that, broadly speaking, the 

 labia of Tachopteryx and Petalura are 

 very similar. The chief differences 

 are as follow. In Petalura the mentum 

 is not so wide as long; in Tachopteryx 

 it is wider than long. The middle of 

 the front edge of the mentum in 

 Petalura projects forward in a triangle; 

 ''''"'•-TSfer^v^SL^oT' ''''' i^ Tachopteryx it is slightly indented 

 a labium, h antenna. medially. The lateral lobes and movable 



hooks are very similar in both, though in Tachopteryx the former 

 are apparently somewhat longer and narrower, and with the 

 apices more suggestive of the jEschnid type than in Petalura. 



The antennae agree in being seven-jointed. In the Gomphince 



they are usually four-jointed; in the JEschnince a short, thick, 



basal joint is surmounted by five or six slender joints forming a 



slender filament. The antennae of Tachopteryx are hairy, those 



2\ 



