BY PUEDERICK A. A. SKUSE. 115 



abdominal segment, of rather simple structure (PI. vi., figs. 43-15) ; 

 9 ovipositor with short slender valves, the upper ones longer than 

 the lower and blunt at the tip. Legs long and slender ; fore and 

 intermediate tibi?e with a single small spur, hind tibiaj provided 

 with a pair ; tarsi very slender, much longer than the tibiae ; 

 ungues distinct, toothed in /. par ((J) ; empodia small, narrow. 

 Wings lanceolate, with a distinct anal angle. Auxiliary vein 

 joining first longitudinal vein about opposite middle of prsefurca ; 

 ultimate section of second longitudinal vein more strongly arcuated 

 in /. serricornis than in the other species ; petiole of second 

 posterior cell about half the length of the cell ; discal cell pent- 

 angular, in punctiform contact with fifth posterior cell at about ^ 

 of its length, more elongate in /. par and /. ruhriventris than in 

 /. serricornis. 



The three species here included form a compact group, and may 

 be at once recognized by the structure of the flagellar joints of 

 the antennae, arcuated ultimate section of the second lonaitudinal 

 vein, yellow tubercle on the front, and structure of the J" genitalia. 



417. IsciiNOTOMA SERRICORNIS, Macquart. (PI. v., fig. 17.) 



Tipula serricoriiis ((J), Macq., Dipt. Exot. Suppl. I. p, 13, 

 pi. 1, fig. 7, 1846 ; T. ehurnea (9), Walker, List Dipt. Brit, 

 ^[us. I. p. 69, 1848; T. albovariegata {$), Macq., Dipt. Exot. 

 Suppl. V. p. 16, pi. 1, fig. 3, 1855. 



(J.— Length of antennae 0-120 inch ... 3-04 millimetres. 



Expanse of wings 0-850 x 0-180 ... 21 -.58 x 4-56 



Size of body 0-650 x 0-120 ... 16-51x3-04 



9. — Length of antennae 0-120 inch ... 3-04 millimetres. 



Expanse of wings 0-950x0-220 ... 24-12x5-58 



Size of body 0-880x0-135 ... 22-34x3-42 



Head brown or greyish-brown, the frontal tubercle fulvous- 

 yellow : rostrum brown ; suctorial labella, palpi, and antenn;« 

 black or deep brown (in one $ specimen the flagellar joints 

 fulvous-brown) ; first joint of the scapus about \ longer, and 

 thicker than the first flagellar joint; second more than half the 



