L1MNOBIA. 291 



radial and cubital longer than their common petiole, which forms an 

 angle near its base, and is connected with the third exterrio-raedial by 

 an angular veinlet very near its fork ; radial forked near its base, its 

 fore fork connected by a short veinlet with the subcostal very near the 

 tip of the latter; first and second externo-medial veins longer than 

 their common petiole, which springs from the angular veinlet before 

 mentioned, and which is connected by a veinlet at its fork with the 

 fore branch of the third externo-medial ; third extemo-medial connected 

 with the subanal by a veinlet in the short space between its fork and 

 its junction with the cubital ; discal areolet long, narrow, pentagonal. 



19. littoralis, Meig. Zw. i. 131. 26 (1818); Mcq.; Gimm. Lutea, 

 capite cinereo, palpis nigricantibus, antennis testaceis apice fuscis, alis 

 subcinereis, venis transversis fusco-limbatis, abdomine apicem versus 

 fusco. Long. 5-6; alar. 9-11 lin. 



Luteous, slender. Head cinereous. Palpi blackish. Antennae tes- 

 taceous, brown towards the tips. Wings narrow, slightly greyish ; 

 veins testaceous, blackish towards the tips ; transverse veinlets slightly 

 clouded with pale brown ; stigma obsolete. Halteres testaceous. Ab- 

 domen brown towards the tip. 



Not common. Inhabits watery situations. (E.) 



SECTION 11. 



b b. First extern o -medial vein not forked. 

 c. Radial vein forked. 



SUBSECTION 1. 



Mediastinal vein ending at rather beyond two-thirds of the length 

 of the wing ; subcostal ending a little beyond five-sixths of the length ; 

 radial and cubital springing from a common petiole, which fully equals 

 them in length, and proceeds from the subcostal at about one-third of 

 the length of the wing ; radial forked near its base ; its fore fork con- 

 nected very near the base by a transverse veinlet with the subcostal ; 

 cubital forming near its base an angle, from whence a transverse vein- 

 let joins it with the first externo-medial ; the latter is connected by an 

 opposite transverse veinlet with the third externo-medial, to which it is 

 also united nearer the tip of the wing by an angular veinlet, whence 

 springs the second externo-medial ; third externo-medial joined to the 

 subanal by an oblique veinlet, which is not opposite the discal areolet, 

 but nearer the base of the wing ; axillary vein short. 



20. pilipes, F. E. S. iv. 242. 39 (1792); Gmel.; Hoffm.; Meig.; 

 Staag. ; Ross. (V.); TiQit.fmbriata, Meig.; Gimm.; Schumm. Nigro- 



fusca, capite palpis antennisque basi thoracis vUtis tribus abdominis in- 

 cisuris later ibus apiceque pedibusyue ferrugineis, alis fuscis. Long. 3-4 ; 

 alar. 8-10 lin. 



Blackish-brown, rather stout. Head, palpi, and antennae at the base, 

 three stripes of the thorax, sides, sutures, and tip of the abdomen, and 



