AN ACCOUNT OF BRITISH FIIES. 



in the J, joints one to twelve, very small, thirteenth very long, four- 

 teenth short and conical ; in the ? the antennse are pilose, the four- 

 teenth thicker than the others, pubescent and more acuminate. 

 Thorax elevated ; scutellum rather small ; metathorax with a longi- 

 tudinal furrow. Abdomen composed of eight segments, long, haiiy ; 

 more hairy and longer in the $ than in the ? , Wings often pubes- 

 cent ; hairy along the hind border, mediastinal ending at beyond 

 half the length of the wing ; subcostal ending at before two-thirds of 

 the length ; radial emerging from the prcebrachial transverse veinlet, 

 ending at beyond three-fourths of the length ; cubital also proceeding 

 from the praebrachial transverse veinlet, ending at very little in front 

 of the tip, subapical ending at very little behind the tip ; subanal 

 forming a fork of the prsebrachial ; anal complete ; subaxillary not 

 reaching the border. Posterior margin much excavated. Legs long 

 and slender, pubescent, unarmed ; coxre of moderate size, ungues 

 very small; in the cT the fore tarsi are often pilose, bare always in 

 the ? . Plate iv., fig. 6. 



There are as many as nineteen species recorded from Great 

 Britain, but five of these seem of somewhat doubtful occurrence, and 

 there are four reputed species. 



They may be divided into two groups, (A) those with spotted 

 wings, and (AA) those with unspotted wings : 



A. Wings Spotted, 

 {a). Thorax with four dark stripes. - 



i. Testaceous ; ferruginous stripes. '^ 

 Wings gray, with pale spots and with a 

 pale band in the middle. Legs slender, 

 hairy, tips of the joints dark brown. 

 Length, 2 to 2\ lin. Common. 



ii. Silver - gray. Wings with a gray ^ 

 spot near the fore border at three-fourths 

 of length and with gray streaks on the 

 veins along the hind border. Costal 

 veins black. Legs pale testaceous. 

 Length, 3 to 4 lin. Common. 



iii. Hoary. Wings clouded with gray, 

 nearly limpid along the costa towards 

 the base and at the tips ; discal trans- 

 verse veinlet clouded with black. Abdo- 

 men brown, posterior borders of seg- 

 ments nearly white. Length, i^ to 2 lin. 

 Common. 



Var///s, F. 



NclmlosHS, Mg. 



Choreas, Mg. 

 =fasiiafiis, Mg., 

 sylvaticns, Mg. 



