338 TIPULID.E. 



veinlet close to its tip; radial and cubital springing from a common 

 petiole, which is about one-sixth of their length, and proceeds from the 

 subcostal at half the length of the wing, and is connected with the ex- 

 terno-medial by a transverse veinlet at a little before its fork ; cubital 

 forked at half its length ; externo-medial forked near its tip, connected 

 with the subanal by a transverse veinlet, whose angle emits another 

 externo-medial; subanal undulating beyond its junction with the ex- 

 terno-medial; anal curved near its tip towards the hind border; axil- 

 lary rudimental ; no discal areolet ; a streak or spurious longitudinal 

 vein at a little in front of the externo-medial. Abdomen with eight 

 segments, narrow at the base. Legs of moderate length, slightly pu- 

 bescent, unarmed ; coxfE moderately long ; femora I'ather thicker 

 towards their tips ; tibife with spurs at their tips. Male. Antennae a 

 little longer than the thorax. Abdomen slightly incrassated towards 

 the tip ; anus moderately thick, rather short, hardly reflexed, furnished 

 with four subclavate appendages. Fern. Antenna? a little shorter than 

 the thorax. Abdomen distinctly incrassated towards the tip, which is 

 acute; two anal, ensiforra, parallel, slightly curved, moderately long 

 styles. Larva aquatic, vermiform, very long, much narrower at the tip 

 of the abdomen, which is terminated by a very long and delicate tube, 

 serving to convey the air to two tracheae, which extend through the 

 entire length of the body. The pupa on the contrary has the head fur- 

 nished with a very long thread-like appendage, which has the same 

 office as the anal tube of the larva ; its abdomen is terminated by four 

 small points. 



These flies inhabit aquatic plants on ditches, and on the banks 

 of ponds, from the spring to the autumn. 



a. Hind tarsi white. Species 1. 

 a a. Hind tarsi not white. 

 b. Wings spotted. 



c. Abdomen with tawny spots or bands. Species 2, 3. 

 c c. Abdomen wholly black, except at the tip. Species 4. 

 h b. Wings not spotted. Species 5. 



1. albimana, r.E. S.iv. 239. 24(1792); Gmcl. ; Meig. ; Mcq. ; 

 Sta?g. ; Ross. (V.) ; Zett. Nigra, scutello abdominisquc macnlis aut 

 fasciis fulvis, alis subciuereis fusco-subfasciatis, pedibus testaecis, fe- 

 moribus tibiisqiie apicc tarsisque nigris, tarsis posticis albis. Long. 

 4-6; alar. 8-12 lin. 



Black. Proboscis and palpi tawny. Thorax with a tawny suture 

 between the wings. Scutellum tawny. Wings slightly greyish ; trans- 

 verse veiidets in the disc of the wing, and apical forks at their base 

 clouded with brown. Halteres testaceous. Abdomen with two tawny 

 spots on each side ; these spots vary in size and distinctness, and are 

 sometimes united in the male ; tip tawny. Logs testaceous ; tarsi and 

 tips of the femora and of the tibirc black ; tibia; darker than the fe- 

 mora ; hind tarsi white, with black tips. 



