THE MYCETOPHILID.E. 133 



B. diibia, Staeg. 



This is a black gnat. Head and thorax covered by a gray tomen- 

 tum ; antennae slender, i6-jointed and a little longer than the thorax. 

 The abdomen is long and dark. Wings have the fork of the fifth 

 longitudinal vein nearer to the base of wing than the fork of the fourth 

 longitudinal vein ; sixth extends nearly to the fork of the fifth. Legs 

 testaceous, long and slender ; tibiae dark, posterior tibife with long 

 spurs and short spines : tarsi black. Length 3 to 3^ lin. 



„ . . ... ( Mycetophila sciarina, Mg. 



B. sciarina, Staeg. = \ ' & 



*= ( M. obscurella, Zett. 



This is a blackish-brown species, very widely distributed. Zetterstedt 

 describes it from Norway, etc., under the name obscurclla. It is, 

 according to Walker, slightly covered by a gray tomentum. Palpi 

 and antennas are blackish-brown ; the antennae are twice the 

 length of the thorax. The body is clothed with yellowish hairs. The 

 anal segment is longer than the one before it. The legs are testa- 

 ceous, and the spurs short ; tarsi blackish-brown, and the hind tibiae 

 with very few short spines. The wings have a grayish tinge ; second 

 and third longitudinal veins very distinct, brown ; the fourth and fifth 

 pale; the sixth fairly long, extending beyond the fork of the fifth. 

 Length \\ to 2 lin. 



The other British species are trivittata,''' Mg. (System. Beschr. i., 

 258, 10); borealis, Zett. (Dipt. Scand., xi. 4,160, ^); plana, Wlk. 

 (Ins. Brit., vol. iii., p. 34) ; aiialis, Mg. (System. Beschr., i., 257, 9). 



Genus Leptonwrphus, Curtis. 

 This genus was formed by Curtis, one species only being known. 

 The body is slender ; head small ; palpi 4-jointed, long and slender, 



Fig. 26. — Yi^'xA oi Lcptoiiiorplnis Walkeri. 

 fourth joint longest. Eyes oval; ocelli two. Antennae i6-jointed, 

 filiform, about half length of body. Thorax very short. Abdomen 

 compressed, thickened at the tip ; the hypopygium large. Legs long 

 and slender, very small spines to tibia and very long spurs. Wings 

 narrow, hairy ; costal ends a little in front of tip of wing ; first longi- 

 tudinal vein long, connected with the second by a transverse veinlet 

 * Taken at Linton, Ivybridge, Loch Maree and Tongue, in June. (Verrall.) 



