TIPULA. PACHYBHIXA. 339 



243. Tipula elegantula, sp. nov. (PL V, fig. 17.) 



c? . Head : vertex blackish grey, a narrow median darker line ; 

 remainder of head brownish yellow, a little darker about the 

 proboscis and palpi. Antenna! scape yellow, flagellum blackish, a 

 single verticel of four hairs at the base of each joint. Thorax 

 rather deep brownish yellow on the major part of the dorsum, 

 with no obvious stripes ; lighter posteriorly, and the colour at the 

 sides fading away to a pale yellow. Scutellum and metanotum 

 brownish yellow, shining, the former sometimes a little darker. 

 Abdomen yellowish at base, changing to blackish before the middle. 

 Genitalia large, conspicuous ; a black bifid dorsal plate ; 1st joint 

 of claspers normal, 2nd joint ending in two pairs of appendages ; 

 the first club-shaped, with thick black hairs, the second two- 

 jointed, with bristly yellow hairs and a row of stiff black bristly 

 hairs along the inner side ; the second pair of appendages un- 

 symmetrically conical, black ; a large V-shaped ventral plate with 

 yellow hairs, and a pair of blackish finger-like inner appendages 

 can be seen. Legs : femora dirty yellow or blackish, lighter at the 

 base ; coxae pale yellow ; extreme ends of femora narrowly pale ; 

 tibiae and tarsi blackish. Wings very pale yellowish grey, costal 

 cell yellowish, stigma a little browner ; petiole of 2nd posterior cell 

 short, about one-fifth the length of the cell. Halteres blackish. 



Length 12 millim. 



Described from two males from Mazbat, Mangaldai district, 

 Assam, 11-15. x. 10 (Kemp). 



Type in the Indian Museum. 



Genus PACHYRHINA, Mac?. (PI. V, fig. 18.) 



Pachyrhina, Macquart, Suit, a Buft'., Dipt, i, p. 88 (1834) ; Schiner, 

 Fauna Austr. ii, p. 503 (1864). 



GENOTYPE, Tipula crocata, L. ; designated by Westwood (Intr. 

 Class. Ins. ii). 



Macquart's definition of this genus is not exactly a good one, 

 as he lays no special stress on the only character in which it 

 actually differs from Tipula, this character, moreover, being by no 

 means absolutely constant. This is the sessile or non-petiolate 

 nature of the 2nd posterior cell, due to the furcation of the 

 anterior branch of the 4th longitudinal vein occurring at the 

 distal end of the discal cell and not after quitting that cell, as in 

 Tipula. In some species, however, the 2nd posterior cell actually 

 is petiolate, the petiole being very short and the character varying 

 to a somewhat considerable extent, comparatively speaking, in thy 

 same species, even in the two wings of the same individual. 



Range. World-wide. 



Macquart's remark about the antennas being " filiform, nearly 

 setaceous," is distinctly wrong, as the antennae are as compact 

 and the joints as easily seen as in Tipula. 



