686 MESO^OIC INSECTS OF QUEENSLAND, ii., 



bounding the triangle proximally, and enclosed by a continuation 

 of A above (this must be a specialised cross- vein, if the formation 

 is the same as in recent Anisoptera), Aj proximally, and the bent- 

 down portion of Cu distally. Posteriorly, the area is narrowed 

 by the converging of Ai towards Cu; but whether they ever 

 meet, so as to complete the closure of the subtriangle, there is 

 unfortunately not quite enough of the wing preserved to show 

 us. At the edge of the fracture, Cu appears definitely to 

 have turned, so as to run closely parallel to and above Aj ; so 

 that the chances are that this area is not closed off posteriorly by 

 any strong vein. Within the subtriangle, a number of small, 

 irregular, polygonal areolets form a close meshwork, four cells 

 wide in the broadest portion. Proximally, the subtriangle itself 

 is supported by two struts, f and ^, formed by alignment of the 

 boundaries of numerous cellules. Of these, f passes from A., to 

 Ai almost at right angles, meeting the latter at its bend; while 

 (J is much longer and very oblique, meeting Aj just on the edge 

 of the fracture. 



Distally from the triangle, there lies a broad area containing 

 a very large number of small,' irregular, unspecialised, polygonal 

 cellules. As far as I can make these out, they are much more 

 numerous than AVoodward's figure would indicate; and I can find 

 only the slightest traces of the supplements indicated by him as 

 descending obliquely from the most proximal portion of Mspl; 

 nor is that part of Mspl itself at all evident. Plate xliii., fig. 11, 

 shows more accurately the appearance of this area. 



The Nodus (Text-fig. 10). 



This area is \ ery well preserved, on the whole; but, unfortu- 

 nately, the nodus itself is a weak formation, so that its exact 

 structure is not easy to determine. I have studied it under 

 oblique light from several different directions. A correlation of 

 the drawings obtained in this manner gives the result shown in 

 Text-fig. 10, which, I think, is as accurate as we can hope to get. 



Approaching the nodus, the costal vein is not strongly formed, 

 and shows practically no sign of "ribbing." At the nodus itself, 



