1902.] DUAGONFLIES OF THE " SKEAT EXPEDITION." 91 



margin. In the upper half is a large black spot, and at the bottom 

 of the lower half is a smaller spot also black. 



Wings hyaline. Oviter two-sevenths of fore wings (which ai-e 

 without pterostigma) opaque dark bro-wTi. Five antenodals (six 

 in one case). Lower wings with a slight brownish opacity at the 

 margin. Postnodals 11-13. 

 Length of hind wing 17 mm. 



Abdomen black, with the following yellow marks: — On seg- 

 ments 2-6 a dorsal spot divided longitudinally into two by the 

 mid-dorsal black carina,. On segments 4-5 these marks have an 

 anterior lateral prolongation, giving them the appearance of two 

 figure 7's lying back to back ; in segment 6 the lower limb of 

 the 7, so to speak, has disappeared, leaving merely two anterior 

 marginal lines. A large lateral spot on segment 1. On either 

 side of segments 2-3 are two spots in the form of a !, the 'dash' 

 being anterioi-. On 4-5 only the ' dash ' is present and is very 

 small on 5. Anal appendages black, upper pair two-thirds length 

 of the 9th segment. 



5 . Head as in the male, with black less velvety, yellow marks 

 lighter, and the following additional yellow markings : — Basal 

 parts of lower lip and of labrum, epistome with a yellow spot on 

 either side. Frons with four spots arranged in the form of a 

 square, the anterior pair larger than the posteiior. Genal region 

 yellow. 



Prothorax and thorax as in the male, but the thorax has a 

 median dorsal yellow stripe. Abdomen dull black, with a fine 

 mid-dorsal yellowish line on each segment, not continuous at the 

 margins from segments 2-9. In 9 it occupies only the posterior 

 half of the segment. Segments 1-9 each with a conspicuous 

 lateral yellow mark running nearly the whole length of the seg- 

 ment, narrowest at the middle except in 9, where it is reduced 

 to a spot at the hind end of the segment, which is larger than 

 the eighth, as large as the seventh. Tenth very small. Length 

 of abdomen 13 mm. 



Wings hyaline, pterostigmata pale brown. Length of hind 

 wing 19 mm. 



Differs from M. semiopacus in having the apex of the hinder 

 Aving opaque, in the possession of markings on the head, and in 

 the spots on segment 6 of the abdomen. The brown mark of the 

 front wings is also rather less extensive, 5| mm. ; 6 in M. se^ni- 

 opacus. From M. martince Karsch it differs in having only 

 thi'ee yellow spots at the back of the head, in the markings at the 

 sides of the thoiux, and in having the dorsal abdominal markings 

 broader in front ; also in the rather smaller number of ante- 

 nodal nerves on the fore wing. 



