Collin — Notes on Specimens of Borboridce and some Ephijdridce. 247 



19. Limosina zosterce Hal. — Originally (1833) described as follows : — 

 " B. Zosterse. Niger, tarsis luteis, alts denigratis, thorace scutelloque 



opacis planis, antennarum seta alhida. (Long. '06.) 



" Tl}orax with an obsolete depressed line down the back : scutel with 



only about two pair of bristles at the sides and tip : feet short, yellowish, 



2d joint of the hind pair somewhat thickened : wings of an uniform 



opaque smoky tint : knob of the poisers deep brown. 

 " Common upon Zostera, drying on the shore." 



This description was elaborated in 1836 as follows : — 



" Sp. 19. L. Zosterse. Nigra opaca a/is infumatis. 



" Borborus zosterse, Ent. Mag. I. 178. 



" Opaque black : front gibbous, bristly : face much elevated between 

 tlie antennae, which are turned in opposite directions, lying close to 

 the eyes ; their 2d joint is very bristly, and larger than the 3d : the 

 arista thickly pubescent, the pubescence whitish : thorax scarcely 

 pubescent, very flat, with an impressed line down the middle : scutel not 

 as long as the metathorax ; glabrous, with four bristles, as also in 

 those which follow : legs rather short, thinly hairy, piceous, with the 

 knees and feet tawny, or entirely tawny : middle shanks armed with 

 numerous bristles: 2d joint of hind feet not very long, scarcely 

 thickened: poisers with a deep brown knob : wings of a brownish yellow, 

 the nerves of the same colour ; costal more dusky, rather thick, bristly 

 at the base ; 2d nerve extending little more than half way between the 1st 

 and 3d : interval of the cross-nerves considerably longer than the 

 principal one. (Length 1^ ; wings 2 lines.) 



" There is a variety scarcely a third that size, but differing so little 

 in other respects, that I cannot consider it a distinct species. 



" Common on seaweed : Mr. Walker has found it near London ; and 

 also in the Isle of Wight, Cornwall, and North Wales." 



There are four pairs of dorso-central bristles on the thorax, the two front 

 pairs being incurved, while one of the humeral bristles, one notopleural bristle 

 and a bristle quite close to the root of wing are also incurved ; there are four 

 prescutellar bristles, the two middle ones being close together and as strong 

 as the outer ones ; the hind tibiae have two distinct bristles above ; there is 

 no bristle beneath the middle tibiae about the middle ; costal ciliation strong, 

 but scanty at base of wing. 



Four specimens in the Collection. 



The small variety mentioned by Haliday is represented in the Collection 

 by seven specimens of L. brachystoma Stenh. which, in addition to being much 



