240 



tertius subrotundus ; arista trisetosa. Thorax ellipticus. Alee Ion- 

 gee, vena discali transversa nulla. Abdomen thorace paullo longius 

 et angustius. Pedes graciles. 



Body slender, shining, almost bare. Head and thorax convex. 

 Head transverse, a little broader than the thorax. Front broad. Face 

 vertical. Eyes nearly round. Antennae very short ; first and second 

 joints very small ; third nearly round ; arista setiform, very slender, 

 with three hairs on the upper side. Thorax elliptical. Wrings long, 

 moderately broad ; costal vein ending at very little behind the tip of 

 the wing ; subcostal ending at about one-fourth of the length ; radial 

 ending at hardly one-fourth of the length ; cubital ending at the tip ; 

 prsebrachial very slightly curved upward, ending at the tip of the 

 costal ; prsebrachial transverse very near the base of the wing ; no dis- 

 cal transverse vein. Abdomen nearly linear, a little longer and nar- 

 rower than the thorax. Legs slender. 



These insects dwell among herbage ; they are very small, and 

 of feeble structure and flight. 



1. amoena, Meig. Zw. vi. 89. 1 (1830); Mcq. ; Zett. Nigra, ca- 

 pite antico, thoracis lateribus scutello pectoreque pallide flavis, antennis, 

 halteribus pedibusque flavis, alis limpidis, abdomine fulvo nigro-vario. 

 Long, f-1 ; alar. 2|~2i lin. 



Black. Head in front and beneath, sides of the thorax, scutellum, 

 and pectus pale-yellow. Antenna?, halteres, and legs yellow. Wings 

 limpid: veins pale testaceous. Abdomen tawny, more or less black 

 above. 



Common ; may be frequently found on windows and in hay- 

 stacks. (E.S.I.) 



Asteia concmna, Meig., and the following additional genera and 

 species have been recorded as British : 



LEUCOPIS, Neig. LEPTOMYZA, Mcq. TETHNIA, Hal. 



1. puncticornis, Meig. 1. gracilis, Fal. 1. illota, Hal. 



2. obscura, Hal. 



SUBFAMILY 9. PHYTOMYZIDES. 



Alarum vena subcostalis et mediastinalis conjunct^ ; radialis apicemfere 

 attingens ; discalis transversa ab margine remota ; areolce pobrachialis 

 et analis distinctae, longa. Metatarsi postici graciles. 

 Subcostal and mediastinal veins united ; radial ending at much beyond 



three-fourths of the length of the wing ; discal transverse parted by full 



twice its length from the border ; pobrachial and anal areolets distinct, 



long. Hind metatarsi slender. 



The species of this subfamily are very numerous, and are all 



of very small size ; their larvae undermine and feed on the leaves 



