93 • I'^i"!'- 



28.— MYOBIA, Dsv. 



Pybeosia, p. Rnd. 



Gen. ch. — Eyes Bude, frontalia somewhat narrowed in the male, 

 and wide in the female : frouto-orbital bristles extending to about the 

 middle of the second joint of the antennae ; cheeks bare ; antennae 

 with second joint a little elongated, and the third at the most twice 

 as long ; arista pubescent, with the base thickened ; facialia ciliated with 

 a few hairs on their lower part ; vibrissae seated near the sides of the 

 epistome close to the mouth ; palpi long and thick ; abdomen elliptical 

 or conical, with the segments all of nearly equal lengths, the middle 

 ones mostly w'ithout discal setae ; wings with the fourth longitudinal 

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

 Aprii,is92. ^j|]j u-,ogtly 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 difBcult to discriminate them. Zetterstedt, in fact, 

 considers M. longipes and M. pacijicn., 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, lUgn. 



4 (3) Hind femora shorter than the abdomen. 



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



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



M. FENESTEATA, MgU. 

 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-brown in colour ; palpi yellow, sometimes with dark tips ; antennae with 

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

 second ; 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 seta 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 

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

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



