I92I.] 



R. J. TiLYARD : Epioplilcbia laidlawi. 



99 



owing to its greater thickness, did not yield any very clear result 

 in the photomicrographs. In drawing the left hindwing, I used 

 an Abbe camera-lucida, and prepared a "negative" by the simple 

 process of blacking in all the pigment bands which appeared pale 

 on the wing itself. This "negative ", which, of course, would re- 

 present very closely a " positive " of the imaginal wing, (in which 

 the veins are black on a hyaline background), is reproduced in 

 text-fig. 3. 



The cross-venation of the distal part of the wing was not 

 definitely enough outlined to allow of the drawing being completed 

 distally; but a fairly good idea of the position of the cross- veins 

 in this part of the wing maj' be obtained from a study of the photo- 

 graph of the right forewing in plate XIII, fig. 2. 



In the left hindwing, the number of actually visible anteno- 

 dals of the first series is twelve, of the second series fourteen; none 

 of these appear to correspond exactly except the first and fourth 



•'Negative" of imaginal venation in left liind-wing of \arva. oi Epiophlebia 

 laidlawi n. sp. A. anal vein ; Cti . cubitus with its branches Ch|, and C?<.j ; M. 

 media with its branches Mi. M^. M^.^nAM^. ; j1/|a, postnodal sector ; A^, nodus; 

 qn, quadrilateral ; /?, radius ; 5'c. subcosta. 



of tlie first series, which are in line with the first and sixth res- 

 pecti-s-ely of the second series. These, moreover, are much more 

 strongl}' marked than any of the others. Consequently it seems 

 a legitimate assumption that they represent the two so-called 

 " hypertrophied ' ' antenodals, which are found in all the 

 Anisoptera , but outside of that Suborder only in the genus Epio- 

 phlebia. From the photograph of the right forewing (plate XIII, 

 fig. 2) it can be seen that there are eight or more postnodals, though 

 the exact number cannot be determined. 



The nodus is < -shaped and very clearly marked, with M, 

 arising directly from the subnodus below it. I have not marked 

 the position of the oblique vein. in text-fig. 3, as I could not 

 make out the cross-veins clearly in this region of the wing, but in the 

 photograph of the right hindwing (plate XIII, fig. 3), the oblique 

 vein can be clearlj- seen, lying about three cells distad from the 

 origin of Mj, below it. 



