CHTRONOMUS. 171 



brown. Hind borders of the abdominal segments hoary. Legs pale 

 brown. 



Bare. (E.) 



80. involitans, n. Mas, niger, thorace cinereo vittis tribus nigris, 

 alls sublimpidis, venis halteribusque albidis, illis apud costam testaceis, 

 pedibus pallide fuscis, tarsis anticis nigricantibus. Long. 3 ; alar. 4^ 

 lin. 



Male. Black. Thorax grey, with three black stripes. Wings almost 

 limpid ; costal, radial, and cubital veins pale testaceous, the rest whitish. 

 Halteres whitish. Abdomen very long. Legs pale brown, long, slender ; 

 fore tarsi blackish. 



Eare. (E.) 



81. convectus, n. Mas, niger, thorace testaceo vittis tribus nigris, 

 alis sublimpidis, venis halteribusque albidis, illis apud costam testa- 

 ceis, pedibus fuscis, tarsis anticis nigricantibus. Long. 3-4; alar. 

 5-6 lin. 



Male. Black. Antennae with black plumes. Thorax above testaceous, 

 with three black stripes. Wings nearly limpid ; costal, radial, and cubital 

 veins pale testaceous, the rest whitish. Halteres whitish. Legs brown, 

 slender ; fore tarsi blackish. 



Not rare. (E.) 



82. plumosus, L. F. S. 1756 (1761); F. ; Schr. ; Gmel. ; Latr. ; 

 Lam. ; Meig. ; Mcq. ; Gim. ; Zett. grandis, Meg. ; Meig. Mas et 

 Fcem. cano-testaceus, thorace vittis tribus nigro-cinereis, alis sublimpidis, 

 venis halteribusque albidis, illis apud costam nigris, abdomine nigro- 

 cinereo, segmentorum marginibus posticis albidis, pedibus testaceis, tibiis 

 et tarsorum articulis apice nigris. Long. 4-6 ; alar. 6-7 lin. 



Testaceous, with hoary tomentum. Palpi and antennae black. Thorax 

 with three blackish-grey stripes. Wings nearly limpid, with a distinct 

 black discal dot, slightly ciliated along the hind border ; costal, radial, 

 and cubital veins black, the rest whitish. Halteres whitish. Abdomen 

 blackish-grey, pubescent, with a whitish band on the hind border of each 

 segment. Legs testaceous ; COXOB hoary ; tips of the tibirc and of the 

 joints of the tarsi black. Male. Antennas with brown plumes. 



Generally distributed. (E. S. I.) 



83. littorellus? Meig. Zw. i. 26. 12 (1818); Gim. Var.? Mas, 

 viridis, thorace vittis tribus fuscis, alis limpidis, venis halteribusque albis, 

 illis apud discum testaceis, abdomine fuscescente, segmentorum mar- 

 ginibus posticis albidis, pedibus testaceis, femoribus tibiis et tarsorum 

 articulis apice fuscis. Long. 2^; alar. 3. lin. 



Var. ? Green. Thorax with three brown stripes, the middle one 

 double. Pectus and metathorax brown. Wings limpid; costal, radial, 

 and cubital veins, and discal transverse veirilct, pale testaceous, the 

 other veins white. Halteres white. Abdomen brownish ; hind borders 

 of the segments whitish. Legs pale testaceous ; tips of the femora, of 



