36 MR. F. F. LAIDLAW ON 



Male. Wings without markings, with a faint yellow tinge over 

 the whole. Pterostigma black, a little inflated, covering 4+ cells, 

 2 mm. long. An.n. 14, Pn.n. 20, on fore wing. Quadrilateral 

 on all wings divided into 3 cells. One row of cells only between 

 0u 2 and anal margin of wing. Cu 2 begins to be irregular 3 cells 

 beyond level of quadrilateral. 



Head : Labium yellow, mandibles black ; labrum black, with a 

 pair of large yellow spots. Anteclypeus black ; postclypeus black, 

 with a large yellow mark at its summit. Frons black, with a pair 

 of large yellow spots between the antennae. Base of antennae and 

 a minute spot on either side of the ocelli, genae, and margin of 

 frons along the eye up to the level of the ocelli yellow, as is a 

 pair of small spots on the occiput. 



Prothorax black, its anterior margin yellow ; a lateral spot 

 and a mark at the base of the first pair of legs of the same 

 colour. 



Thorax black, a tawny orange antehumeral stripe, incomplete 

 above, and the spots at the base of both pairs of wings of the 

 same colour, as is a broad lateral band extending from the base 

 of the second pair of legs to the metepimeron. In addition there 

 is a pale yellow line covering the upper half of the humeral 

 suture. Under surface black, with yellow at the base of the 

 limbs. 



Abdomen* : The dorsal markings are brick-red, the lateral 

 yellow. Ground-colour black. 



1 has a basal antero-lateral spot, dorsal surface entirely black. 

 2-9 have antero-dorsal marks, broader towards the bases of the 

 segments, separated by the mid-dorsal carina, diminishing pro- 

 gressively in size from 3 to 9 — in 2 and 9 occupying about one- 

 half of the total length of the segment, in 3 to 8 more than 

 one-half. 



2-8 have antero-lateral marks, confluent with the dorsal marks, 

 but diminishing more rapidly in size. 



2-6 have postero-lateral spots, in 2 confluent with the antero- 

 lateral, in the remainder distinct. 



Legs black, coxa?, trochanters, and a mark on the anterior 

 surface of the femur yellow. 



Anal appendages black, the upper pair twice as long as segment 

 10, curved inwards to meet at their extremities ; lower pair about 

 as long as 10, conical and straight. 



Female. Colouring of the head, prothorax, thorax, and legs as 

 in the male, but the yellow or orange is less vivid. Abdomen 

 entirely without the dorsal series of marks ; antero-lateral marks 

 extend from segments 2 to 7 ; postero-lateral spots from 1 to 9, 

 but very small on the last three. Wings with a deeper tinge 

 of yellow than in the male. 



This species is very nearly allied to an unnamed species noted 



* In describing the colouring of the abdomen I employ a modification of the 

 terms suggested recently by Mr. Kennedy (Proc. U.S. Nat. Mus. xlvi. p. 114, 

 1913). 



