91. [April. 



vein bent at a blunt angle or in a curve ; tarsi witb the claws and pul- 

 villi mostly small in both sexes. The four known British species are 

 all more or less lutescent in colour, and very similar to each other, so 

 that it is very difficult to discriminate them. Zetterstedt, in fact, 

 considers M. longipes and M. pacijica, Mgn., only as varieties of M. 

 inanis, Fin. They all belong to Eondani's sub-genus Pyrrosia ; the 

 middle abdominal segments being without discal setae, and those on 

 the margin of the last segment being arranged in a single series. 



1 (2) Fore femora with a black stripe on the upper surface...!, fenestrata, Mgn. 



2 (1) Fore femora entirely yellow. 



3 (4) Hind femora as long as the abdomen 2. longipes, Mgn. 



4 (3) Hind femora shorter than the abdomen. 



5 (6) Abdomen in great part yellow 3. inams, Fin. 



6 (5) Abdomen only yellow at the base 4. pacijica, Mgn. 



M. TENESTRATA, Mgn. 



Frontalia occupying about one- fourth of the width of the head in the male, and 

 one-third in the female ; frontal stripe narrower than the sides of the frontalia, and 

 reddish-bi'own in colour ; palpi yellow, sometimes with dark tips ; antennae with 

 first and second joints testaceous, and the third black and twice the length of the 

 second j thorax dark grey, with four rather narrow stripes, and with three outer 

 dorso-central bristles behind the transverse groove ; scutellum yellowish-grey ; 

 abdomen dark brown, with the sides of the first and second segments yellow and 

 translucent, leaving a central dorsal dark stripe of moderate width, which widens as 

 it goes backwards, spreading out and covering the whole of the third and fourth 

 segments ; anal segments in the male dark grey ; no discal setse on any of the seg- 

 ments, and the setce round the lower margin of the fourth segment arranged in a 

 single row ; wings with the outer cross vein straight and upright, and placed about 

 one-fifth nearer to the angle of the fourth longitudinal vein than to the inner cross 

 vein ; legs yellow, with the exception of the tarsi, which are black, and of the fore 

 emora, which are more or less nigrescent upon their anterior surfaces. Very rare ; 

 have only seen one British specimen, which is in Miss Prescott-Decie's collection. 



M. LONGIPES, Mgn. 



I have not seen a specimen of this species, but it is recorded as British by 

 Walker. It is described as having a very narrow frontal stripe ; antennae with the 

 third joint not much longer than the second ; thorax with indistinct stripes ; abdo- 

 men with the dark dorsal stripe so narrow over the first abdominal ring that in the 

 female the yellow sides coalesce and form a large oval pa ch ; the legs are also longer 

 than in the other species, the hind femora i-eaching to the end of the abdomen. 

 Very rare. 



M. INANIS, rin. 



This (the most common, and the typical species) closely resembles M. fenestrata, 

 it is, however, usually rather larger, and altogether paler in colour ; the frontal 

 stripe is as wide as the sides of the frontalia, instead of being narrower ; the thora- 



