142 BIBJOMD.l . 



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

 clusters beneath the bark of pales. (E. S. 1.) 



2. bifilata, Hal. MSS. Nigra, thorace parum nitido sutjli/ 

 pallido pubescent?, pedibns nigro-J'nscis, tibiis litlcis apice (tibiis poxtic'us 

 etiani annulo media) nigricantibits, alls Jiyalinis, radice, lincola ante alas 

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

 pallide flavis, ca3teris decoloribus, halteribns flavidis ; Mas, abdominc 

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

 longioribus, altero paullo longiore apice setaceo, altero obtuso ; - 

 abdomiuis apice valvulis compressis obtusis, antennis articulis discretis. 

 Long, fere 1% ; alar, fere 4 lin. 



Black. Thorax with very jine pale pubescence, slightly shining. l> 

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

 lowish. Legs piceous black; tibiae luteous, icith blackish tips; hind 

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

 subfalcate apical valves. Fein. Joints of the antennae not crowded to- 

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

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

 the other, which is obtuse. 



Rare. In Mr. Haliday's collection. (I.) 



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

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

 adlnic pallidioribus, cajteris decoloribus, halteribus albidis, venis de- 

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

 attingit flexn subito (abruptius quam S. notata), porro vena radiali 

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

 gustiore, pedibus piccis, tibiis basi luteis. Long, vix 1 ; alar. 2 \ lin. 



Black, shining. Antennae shorter than in S. notala. Thorax narrow, 

 compressed. Things limpid ; primary veins yellow, llalteres whitish. 

 Legs piceous ; tibiae luteous at the base. 



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



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

 Zett. oc/tructta, Meig. Fulvu, capite autenuisque nigris, alis sublini- 

 pidis, venis albis apud cos tarn fulvis, abdominis dorso nigro ; var. /3. 

 thoracis dorso nigro. Long. 1-li; alar. 3-3 A lin. 



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

 subcostal, and radial veins tawny, thejest 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 houeydew of Ajjh'ix l!^>,'ix and of A. 

 Lurid*. (E. I.) 



