TANYPUS. 199 



are retractile within the leg, and even within the body. The two 

 posterior legs are placed at the anal end of the body. They are 

 similar to the fore leg, but larger, and entirely separate from each 

 other, being not, like thein, retractile within the body, but always 

 stiif and extended ; these also are armed with hooks. By the in- 

 flection of the anus the larva can give them any kind of lateral 

 movement, except that it can neither bend nor shorten them.'" 

 The species may be grouped thus : — 



J. Wings spotted. 



a. Thorax witli four darker stripes. Species 1-3. 

 a a. Thorax with three darker stripes. Species 4-9. 

 a a a. Thorax iudistinctly striped. Species 10. 

 A A. Wings not spotted. 

 a. Thorax striped. 



b. Thorax with three brown stripes. Species 11, 13. 



h b. Thorax with three reddish or hiteous stripes. Species 13-15. 



b b b. Thorax grey, with bhick stripes. Species 16. 

 a a. Thorax not striped. Species 17. 



1. varius, Fabr. Mant. Ins. ii. 325. 45 (1787); Gmel.; Meig. ; 

 Latr. ; Fries ; ]\Icq. ; Gira. ; Stfeg. ; E,os. ; Zett. Mm et Fcem. testa- 

 ceiis, tJiorace vlit/,t quaUior ferrug'meis, alls cinereis, fascia media macii- 

 Usque albidis, halteribus all)idis, femoribus, tibiis tarsisque posterioribus 

 apice fuscescentibus ; Mas, antennarnm plumis et abdominis suturis fus- 

 cescentibus. Long. 2-2 \ ; alar. 4-5 bn. 



Testaceous. Thorax with four ferrufjinous stripes. Wings grey, with 

 whitisli spots, and with a whitish middle band ; veins pale, partly 

 blackish. Halteres whitish. Legs slender, pubescent ; tips of the 

 posterior femora, tibia;, and tarsi brownish ; fore tibia longer than the 

 fore metatarsus by one-third. Male. Anteunte with brownish plumes. 

 Abdomen hairy, paler than that of the female ; sutures of the segments 

 brownish. 



Generally distributed. (E. S. I.) 



2. nebtdosus, Meig. Zw. i. 57. 2 (1818); Fries; Mcq. ; Curt.; 

 Zett. ; Gim. ; Stseg. Mas et Frem. canus, thornce vittis qnatuor fitscis, 

 alis sublimpidis, macnla antica apices versus strigisque marrjinalihis pos- 

 ticis cinereis, halteribus albis, abdomine nigro-cinereo, segmcutis albido- 

 raarginatis, pedibus testaccis, femoribus, tibiis et tarsorum articulis apice 

 fuscis. Long. 3-4 ; alar. 5-6 lin. 



Mah and Fern. Hoary. Thorax toith four brown stripes. Wings 

 nearly limpid, with a grey spot near the fore border at three-fourths of 

 the length, and with grey streaks on the veins along the hind border ; veins 

 along the costa black, the rest paler. Halteres white. Abdomen black- 

 ish-grey ; hind borders of the segments whitish. Legs slender, dull 

 testaceous ; tips ot the femora, of the tibiai, aud of the joints of the 



