1902.] DRAGOXFLIES OF THE " ,SKEAT EXPEDITIOX." 81 



are scarcely visible. Segments 3-7 have an incomplete basal 

 orange ring, occupying in segment 3 about one-fourth of the 

 segment, in 4-6 not more than one-sixth, and in 7 not more than 

 two-fifths of the segment. Remaining three segments black, 

 decreasing successively in size ; anal appendages pointed, larger 

 than the tenth segment, yellow. 



Differs from the typical race in the smaller extent of the yellow 

 marks on the abdomen. The yellow lozenge-shaped dorsal spot 

 on segment 3 is present, that on 4 is scai-cely visible. The great 

 length of the first two cells between the sectors of the arculus is 

 remarkable. The cross nervule enclosing the third cell is beyond 

 the level of origin of the principal sector. 



Legion LiNDEXiA. 

 GoMPHiDiA PBRAKEXSis, sp. n. (Plate YI. figs. 1, 2.) 



Total length 78 mm. 



Length of abdomen (without ap- 

 pendages) 54 ,, 



Breadth of head 125 „ 



Length of hind wing 54 ,, 



„ „ fore wing 54 „ 



,, ,, pterostigma 8 ,, 



Breadth of hind wing 14 ,, 



Length of upper anal appendage... 4 ,, 



Colovir black with saffron-yellow markings ; wings hyaline, 

 reticulation black. 



Fore wing. 22 23 antenodals, 17-18 postnoda's. Liternal 

 triangle divided into three cells ; discoidal triangle into four, 

 Membranule small, dark brown. Pterostigma long, black. 



Hind wing. 15-16 antenodals, 20-21 postnodals. Internal 

 triangle divided into three cells ; discoidal triangle into four. 



Head. Labium, mandibles, and labrum black ; gena black, with 

 a dull yellow spot. Rhinarium safiron-yellow ; nasus black, with 

 a saffron-yellow spot on either side. Anterior surface of frons 

 black, horizontal surface yellow. Vertex and occiput black. 

 The vertex has two conical projections, one on either side as in 

 G. T-nigrum, but not so lai-ge relatively. Prothorax black. 



Thoraxhlsick, with the following saffron-yellow marks : — In front 

 dorsally a semicii'cle broken by the mid-doi-sal carina. From the 

 outer ends of the semicircle, but separated widely from them, a 

 short broad band runs on either side to the ante-alar sinus, 

 inclining towards the middle lines. Behind these on either side 

 is a small spot, just below the sinus and immediately in front of 

 the first pair of wings. Laterally are two large bands widely 

 separated. The first pair run obliquely forward from below the 

 first pair of wings ; the second pair are rather smaller, and run 

 obliquely forward from below the second pair of wings : neither 

 pair reaches the ventral surface. 



Dorsally between the wings there are brown narks and a 

 Proo. Zool. Soc— 1902. Vol. I. No. VI. 6 



