270 (ESTRID^. 



Body subfusiform, pilose. Head a little narrower than the thorax. 

 Vertex moderately broad. Front large, widening towards the face. 

 Face short, broad, concave, with a middle ridge. Eyes of moderate 

 size, nearly elliptical, rather prominent. Antennae extremely short, 

 partly concealed by scale-like processes above them ; first and second 

 joints very minute ; third round ; fourth and fifth obsolete ; sixth stout, 

 bare. Thorax much longer than broad, with a very slight transverse 

 furrow ; scutellum very short. Wings rugulose, of moderate length ; 

 costal vein ending at a very short distance in front of the tip of the 

 wing ; subcostal ending at a little beyond half the length ; mediastinal 

 ending at before two-thirds of the length ; radial ending at about five- 

 sixths of the length ; cubital ending at the tip of the costal ; prcebra- 

 cldal forming a very obtuse angle at its junction with the discal trans- 

 verse, very slightly curved inward from thence to its tip, which joins the 

 tip of the cubital; pobrachial inclined towards the hind border; discal 

 transverse undulating, parted by nearly its length from the border, and 

 by very much more than its length from the prsebrachial transverse. 

 Alula very large. Halteres concealed by the alulae. Abdomen oval, 

 as broad and as long as the thorax, concave and retracted beneath. 

 Legs hairy, rather long and stout. Ungues and onychia rather long. 



1. Bovis, F. E. S. iv. 231. 3 (1792) ; Fischer ; Schr. ; Latr. ; Lea. ; 

 Clark ; Meig. ; Mcq. ; Guer. hamorrkoidalis, L. Var. Ericetorum, 

 Lea. ; Curt. Nigro-fusca, capite flavo-albido hirto subtus testaceo, 

 facie antermisque nigris, thorace testaceo-hirto, alis subcinereo-hyalinis, 

 abdomine nigro-hirto basi testaceo-hirto apice luteo-hirto, pedibus ful- 

 vis, femoribus piceis. Long. 5-6 ; alar. 9-11 lin. 



Body blackish-brown. Head clothed with yellowish-white hairs, 

 pale-brown above, testaceous in front and beneath. Face on each side 

 of the middle ridge and antenna) black. Processes above the antennas 

 ferruginous. Thorax with four interrupted longitudinal ridges, clothed 

 with testaceous hairs. Wings greyish-hyaline; veins and halteres 

 brown. Alulae white. Abdomen clothed with black hairs in the mid- 

 dle, towards the base with testaceous hairs, and at the tip with orange 

 hairs. Legs tawny ; coxae black ; femora mostly piceous ; tibiae with 

 piceous stripes. 



" The tip of the abdomen of the female is furnished with a tube 

 of a corneous substance, consisting of four pieces, which are re- 

 tractile within each other. The last of these terminates in five 

 points, three of which are longer than the others, and hooked; 

 when united together they form an instrument very much like an 

 auger or gimlet. Lays its eggs on the hides of oxen, which, as 

 soon as they are aware of the presence of the fly, the whole terri- 

 fied herd, with their tails in the air, or turned upon their backs, 

 or stiffly stretched out in the direction of the spine, gallop about 

 their pastures, making the country re-echo with their lowings, and 



