XYLOTA. 255 



and parallel in repose ; middle transverse vein very slightly oblique ; 

 subapical areolet entire ; axillary lobe distinct ; subcostal and radial veins 

 ending separately in the margin ; transverse prcsbrachial vein placed 

 beyond the middle of the discal areolet. Alulae small. Halteres uncovered. 

 Abdomen sublinear ; first segment short ; fifth generally hidden. An- 

 terior legs short, slender ; hind legs stout, much larger ; hind femora 

 clavate, subspinose; hind tibia3 curved, sinuated on the inner side. 

 Male. Eyes contiguous; facets of the front larger than those else- 

 where. Abdomen linear, obtuse at the tip. Jem. Eyes parted. 

 Abdomen fusiform, conical at the tip. 



The larvse of some species live in decayed wood. 



1. sylvarum, L. s. n. ii. 985. 37 (1767); Fb. ; Pz. ! fn. xlv. 

 21; LI.; Fin.; Mg. ; Mq. ; 7Ai.impigra,^i.\ fn. xlv. 21. Clmly- 

 bea, fulvo-hirta, capite albo-pubescente, antennis nigris, alis subcinereis, 

 abdominis apice aureo-hirto, tibiis basi fiavis, tarsis fulvis. Long. 6 ; 

 alar. 12 lin. 



Chalybeous, clothed with short tawny hairs. Head black, as broad 

 as the thorax, covered in front and beneath with white shining down, 

 clothed beneath with white hairs. Mouth and antennas black. Thorax 

 with an aeneous tinge, partly divided by an indistinct transverse suture, 

 which is before the base of each wing ; scutellum with a slight suture 

 along its hind border. Wings pale grey ; stigma brown. Alulas white. 

 Halteres yellow. Abdom.en clothed towards the tip with gilded hairs. 

 Tibiae yellow towards the base ; tarsi tawny, with black tips. 



Generally distributed. (E. S. I.) 



2. lenta, Mg. zw. iii. 222. 15 (1822); Mq.; Ztt.pigra, Shr. ; 

 Fin. ; Pz. ! fn. Ixv. Nigra, alis subcinereis, vein's fusco-subnebulosis, ab- 

 dominis segmentis secundo et tertio rufis. Long. 6 ; alar. 12 lin. 



Black. Face and epistoma covered with shining white down. Third 

 joint of the antennae piceous, covered with tawny bloom. Wings pale 

 grey, slightly tinged with brown along the borders of the veins. Hal- 

 teres yellow. Second and third abdominal segments red. Hind legs 

 very long. 



3. segnis, L. s. n. ii. 988. 57 (1767); Dg.; Fb. ; Shr.; Pz. ! fn. 

 Ix. 3 ; LI. ; Fin. ; Mg. ; Mq. ; Ztt. Chalybea, antennis nigris apice 

 piceis, alis subcinereis ad costam subfuscis, abdominis segmentis secundo 

 et tertio fulvis, tibiis tarsisque anterioribus fulvis, illis nigro-cinctis, 

 tibiis posticisbasi fulvis. Long. 3^-5 1; alar. 7-11 lin. 



Chalybeous, covered in front and beneath with shining white down, 

 clothed beneath with white hairs. Mouth piceous. Antennas black ; 

 first and second joints beset with black hairs and bristles ; third joint 

 piceous. Scutellum with a transverse furrow near its hind border. 

 Wings pale grey, slightly tinged with brown between the costa and the 

 disc; stigma brown. Alulae white, with yellow borders. Halteres 

 tawny. Second and third abdominal segments tawny. Anterior tibiae and 



