142 BIBIONID^E. 



sewers, from the spring to the autumn, and occasionally dwells in 

 clusters beneath the bark of pales. (E. S. I.) 



2. bifilata, Hal. MSS. Nigra, thorace parum nitido subtilissime 

 pallido pubescente, pedibus nigro-fmcis, tibiis luteis apice (tibiis posticis 

 etiam annulo media) nigricantibus, alls hyalinis, radice, lineola ante alas 

 et puncto infra (hoc obscurius) flavis, venis costali subcostali et radiali 

 pallide flavis, cseteris decoloribus, halteribus flavidis ; Mas, abdomine 

 apice valvulis 2 subfalcatis nigris, filis 2 erectis pallidis tarso postico 

 longioribus, altero paullo longiore apice setaceo, altero obtuso ; Fcem. 

 abdominis apice valvulis compressis obtusis, antennis articulis discretis. 

 Long, fere H ; alar, fere 4 lin. 



Black. Thorax with very fine pale pubescence, slightly shining. Wings 

 limpid ; primary veins pale yellow, the rest colourless. Halteres yel- 

 lowish. Legs piceous black ; tibia luteous, with blackish tips ; hind 

 tibiae with a blackish band across the middle. Male. Abdomen with two 

 subfalcate apical valves. Fern. Joints of the antennas not crowded to- 

 gether. Abdomen with two apical, obtuse, compressed valves, and 

 with two long apical setas ; one setaceous at the tip, rather longer than 

 the other, which is obtuse. 



Eare. In Mr. Holiday's collection. (I.) 



3. consimilis, Hal. MSS. Nigra,nitida, antennis brevioribus quam 

 S. notatte, alls hyalinis, vena costali pallide flava, subcostali et radiali 

 adhuc pallidioribus, ca3teris decoloribus, halteribus albidis, venis de- 

 cursu fere qualibus S. scutellata, modo radiali costa parallela quam 

 attingit flexu subito (abruptius quam S. notatae), porro vena radiali 

 paullo propiore ab apice vena3 subcostalis, et areola subcostalis fere an- 

 gustiore, pedibus piceis, tibiis basi luteis. Long, vix 1 ; alar. 2^ lin. 



Black, shining. Antenna? shorter than in 8. notala. Thorax narrow, 

 compressed. Wings limpid ; primary veins yellow. Halteres whitish. 

 Legs piceous ; tibia luteous at the base. 



Not rare on Umbelliferce. In Mr. Haliday's collection. (I.) 



4. flavicollis, Meig. Zw. i. 302. 8 (1818); Mcq. ; Gim. ; Loew ; 

 Zett. ochracea, Meig. Fulva, capite antennisque nigris, alis subiim- 

 pidis, venis albis apud costam fulvis, abdominis dorso nigro ; var. /?. 

 thoracis dorso riigro. Long. 1-l^j alar. 3-3^ lin. 



Tawny. Head and antennae black. Wings nearly limpid ; costal, 

 subcostal, and radial veins tawny, the^rest white ; subcostal vein ending 

 at very much beyond one-third of the length of the wing ; radial ending 

 with the costal at much beyond two-thirds of the length; subapical 

 with very long forks. Abdomen black above, excepting the hind 

 borders of the segments. Var, /3. disc of the thorax black. 



Appears in the autumn ; frequents the flowers of the Ivy, and 

 often appears on the Oak and on the Larch, amongst swarms of 

 S. picea, feeding on the honey dew of Aphis Roboris and of A. 

 Laricis. (E. I.) 



