1902.] DRAGOXFLIES OF THE " SKEAT EXPEDITION." 89 



broader above, runs from below the hinder pair of wings to behind 

 the third pair of legs. The blue sides are margined postei-o- 

 ventrally with a black line. Lower surface black, with two broad 

 blue marks behind the legs. 



Abdomen black. Segments 1-9 with triangular blue spots on 

 either side, their bases resting on the hinder margin of each 

 segment. Those in 2-3 extend the whole length of their seg- 

 ments, that in 4 for half the length of that segment, the rest are 

 small. 



Aoial appendages black. Legs black. The two hinder pairs of 

 femurs and tibias a,i-e white on their inner surface. 



Wi7igs tinged with yellow, blackish in the costal ai'ea from the 

 fifth postnodal cross nerve ; from about three-fifths the distance 

 between the nodvis and the black pterostigma the apical portion 

 of the fore wing is purplish brown to the tip, except along its lower 

 margin, where it is dusky grey shot with iridescent green. The 

 purple mark commences suddenly and its inner margin slopes 

 outwards from in front. 



The outer half of the lower wing is also marked with brownish 

 purple, the extreme apex and the posterior margin excepted, these 

 are greyish brown. The inner border of the purple mark is 

 straight, and the mark is crossed by two rows of iridescent 

 hyaline spots. The inner row consists of three spots. The upper 

 of these, consisting of one row of cells, lies above the nodal sector ; 

 the second, consisting first of one and later of two rows, lies between 

 the subnodal and median sector ; and the third, above the upper 

 sector of the triangle, consists of a single row of cells. The upper 

 spot is nearest to the base of the wings, the lowest is furthest 

 fi'om the base. 



The first row lies at a level of about half of the distance 

 between the nodus and pterostigma. The second row consists 

 also of three spots. The upper is the largest and its distal end 

 just overlaps the pterostigma. It consists of two, followed by 

 three or four rows of cells, and is placed in series with the upper 

 spot of the first row. The lowest spot of the outer series is placed 

 sei'ially with the middle spot of the inner series, whilst the middle 

 spot of the outer series, consisting of a single row of cells, lies 

 between the two others. 



There is also a hyaline spot just at the middle of the hind wing 

 consisting of a single row of cells, this impinges on the inner 

 margin of the brown spot. 



5 . Head as in the male, with the following additional marks 

 yellow : — four spots on the dorsal surface of the ' snout ' and the 

 second joint of the antennae, the upper half of the epistome. 

 The genje are marked with greenish blue in the male and yellow 

 in the female. Prothorax black, with lateral yellow and a fine 

 mid-dorsal yellow spot. 



Thorax black, mesothoracic carina orange ; a fine orange line 

 running to the base of the first pair of wings between the carina 

 and the humeral suture on either side, this latter is also yellow ; 



