OCCURRING ABOUT IIOLYWOOD. 177 



E. cesta. Nigro-esnea, nitidissima, abdovnne magno jmncta- 

 tissimo pubescente cyaneo. (Long. .07.) 



Head and thorax formed as in E. rufipes : seta villose above : 

 abdomen very large and rather convex, 1st segment evanescent, 

 4th comprehending half of the entire, 5th minute deflected ; the 

 whole surface except the incisures deeply and coarsely punctured 

 and pubescent : wings rather small, hyaline, nervure as in 

 E. rufipes. 



Neither this species nor E. rufipes agree well with the 

 present genus ; in some characters they rather approach Noti- 

 phila madezans. Fall. 



Opomyza florum. Var. 



Along the third nervure, between the transverse one and the tip, are 

 from 4 to 7 dusky dots : the body is lighter coloured than in the 

 common variety, and also smaller. 



O. tremula. Castanea, Jujpostomate antennis pedibusque 

 flavis, thoracis dorso cinereo, abdomine nigra, alis basi 

 apice nervoque transversa fuscis. (Long. .15.) 



More robust than O. tripunctata, the wings narrow and more pointed, 

 the spots as in 0. bipunctata : a spot on the hind thighs, and the 

 base of the tibiae are deep brown. 



O. asteia. Nigra, nitida, vertice concalare, capite abdaminis 



basi pedibusque flavis, alis hyalinis. (Long. .1.) 

 Form of 0. gracilis : front face and antennae feiTuginous : seta naked : 



poisers pale yellow : thorax glossy greenish black. 



Inhabits larch trees in autumn ; rare. 

 Borborus pedestris. 



Taken at mid-winter, on the banks of the Wandle, near 

 London. 



B. hamatus. Nigra-ceneus, nitidus, hypastamate nigra, alis 

 ferrugineis, halteribus albidis. (Long. .2+.) 



(To division C.) Segments of the abdomen of nearly equal length : 

 hind feet clothed with glossy yellow hair : 1st joint in the female 

 shorter and dilated, 2d scarcely dilated ; both in the male much 

 broader, and the hind thighs at the base armed with a strong 

 hooked tooth. 

 In woods ; not common. 

 Division e. may be subdivided thus 



•f Dish of the scutel glabrous, sides bristly. 

 NO. II. VOL. 1. A A 



