82 AN ACCOUNT OF BRITISH FLIES. 



H. Poce, Bosc. = H. gra/m'nicola, Wtz. 



The larvse of this species form rough brown oval galls on Poa nemo- 

 ralis, and pupate in these galls. 



(^ Whitish-yellow. Pectus and metathorax dark brown. Antennae 

 grayish-brown, yellowish in places. Wings limpid ; legs brown. 

 Antenna;, 19-20-jointed; shorter than the body ; the joints are twice 

 the length of petiole. The abdomen is dark brown, the sutures being 

 lighter, sometimes yellow, 



? Abdomen tawny ; the posterior borders of the segments have 

 brown bands on them. Antennae, 19-jointed and half the length of 

 body. Joints much longer than the petioles. Tip of oviduct ex- 

 panded, no valves. 



H. piligera, Lw. = ammiipes, Hartig., Wtz. 

 The hairy galls on the leaves of Fagus sylvatica are the home of 

 the larvae of this " gnat." 



$ Dark brown ; palpi yellowish-brown ; antenna; longer than 

 body, joints longer than petioles ; dark brown. Sides of thorax and 

 abdomen flesh-coloured. 



? Antenna; as long as head and thorax ; joints not petiolate. Ovi- 

 duct long, yellow, no valves. 



The joints of the antennae are from 1 7 to 20 in number. 



H. fasciata, Mg. 

 ? Brown ; antennae 14-jointed. Thorax yellowish-brown ; three 

 dark brown stripes and a black spot on each side behind. Pectus 

 dark brown. Abdomen yellowish-white, with a black shining band 

 on the posterior margin of the first to seventh segment. PL ii. (i). 



H. Ftannicce, Vallot = II . floricola, Wtz. 



One often notices the flowers of AcJiillcea Ptarmica deformed and 

 stunted ; this is generally due to the attack of the larvae of this gnat, 

 which live in the deformed flower-heads. 



$ Black ; dark pubescence; antennce brown, i8-jointed. Antenni\i 

 shorter than body, joints twice length of petioles. Sides of thorax 

 brownish-red to pink. Wings broad and milky. Abdomen brownish- 

 yellow. Legs dusky brown, silvery hairs beneath. 



? Antennae only half length of body ; joints five to six times the 

 length of their petioles. Abdomen flesh-coloured. Legs have white 

 pubescence beneath. Oviduct elongated. Length 1 lin. I find 

 this first mentioned in " The Memoirs of the Academy of Science, 

 Dijon," for 1849. 



