o J n [November, 



tlie niicldle pair of stripes more or less confluent forminfr one brnad 

 stripe. The abdomen of the male viewed right from behind shows 

 a large, slightly darker grey, area about middle of second segment 

 and a pair of very indistinct and very small patches of similar 

 colour on third segment. The female is much more unicolorous, 

 even on thorax, than the male. 



Length 4-.5-5-5 mm. 



Both Col. Yerbury and I have taken this species at Walton-on- 

 Naze (Essex) ; in addition Col. Yerbury has found it at Studland 

 (Dorset), and I have taken a singie female at Bhikeney Point 

 (Norfolk). All the specimens (] d, 6 $ § ) were caught in July 

 and August by sweeping the marram-grass growing on the sand- 

 hills. 



Sulgrnits Pseudolimnophoba. 



1 (2) Three pairs of postsutural dorsocentral brislle.«. IMiddle tibiae with 

 only one posterodorsal bristle. Frons viewed from in front with a 

 brownish or brownish-grey sheen 



.... 21. triangula Fin. 



S . Frontalia wide and almost parallel-sided ; frontal orbits and 

 interfroutalia with a brownish tinge. Arista rather distinctly but 

 not very densely pubescent. Thorax brownisli-black with humeri 

 and notopleural depression light grey; hardly striped, though faint 

 greyish stripes may be traced right in front between acrostichals 

 and dorsocentral rows of bristles and there is a tendency for the 

 dark colour to split up into three stripes behind. First abdominal 

 segment largely dark except on hind margin towards side ; second 

 and third segments each with a pair of triangular brownish -black 

 patches occupying the whole length of segment and spreading out 

 on the hind margin almost to the sides; fourth segment darkened 

 about middle. Cubital and discal veins slightly convergent towards 

 tip. 



5 . ^'ery similar to the male, but thorax often much more con- 

 spicuously three-striped. The frons has, as in the male, a 

 brownish-grey and not a silvery-grey appearance when viewed from 

 in front. 



Length about 3 mm. cJ ; 4 mm. $ . 



This species can be confused with only nit/ripes so far as the 

 British species are concerned. There is another closely allied 

 Continental species [poIUnifrons Stein) with onl}' three pairs of 

 ])Ostsutural dorsocentrals which may some day be found in ]iritain. 

 It appears to dili'er from triangula in having the frons with a silvery 

 sheen when viewed right from in front, and the frontal orbits 

 narrowing remarkably towards behind and disappearing before 

 reaching the vertex, while the hind femora have no anteroventral 

 bristles towards tip. Limnospila aJbifrons Zett, is another species 

 which superficially much resembles triangula and niijripes, but is 

 primarily distinguished by having the three sternopleural bristles 

 arranged in an equilateral triangle, a character which places it in 

 the Coenosinac. It resemblts triangtu'a iu having only three 



