new and little-known Tipulidae. Ill 



Nephrotoma delta (Walker). 



Tipula delta, Walker, Ins. Saund. i. p. 445 (1856). 



Pachyrhina dorsopunctata, liruuetti, Rec, lud. Mus, vi. p. 265 (1911). 



Formosa : Cliyosliu, 21. xi. 1916 (7'. Shiraki), 1 ? . 

 Agrees well with Walker's type and with Bruuetti's 

 description. 



Ctenacroscelis, Enderlein. 



The species dealt with below all belong to the brobilig- 

 nagius group, the members of which are distiuguished by 

 their great size, brownish wings without conspicuous mark- 

 ings, vein Cu more or less dark-bordered, especially about 

 the folk, and a narrow dark stripe on the ochreous pleurje 

 extending from the neck to below the wing-base ; the 

 praescutum has three almost confluent blackish-grey stripes, 

 the middle one more or less distinctly divided by a dark 

 line ; the antennse, except for the apical part of the flagellum, 

 are light ochreous, and have the verticillate hairs very short, 

 sometimes barely perceptible. 



The umbrinus group shows a very similar coloration, but 

 the insects are much smaller, the first joint of the antennae 

 is dark, and the praescutum generally has four dark stripes, 

 the middle pair separated by a narrow pale line. 



The pr(Bpotens group (pr<spotens, Wied., monochrous, 

 Wied., rex, Alex., etc.) differs from the brobdignagius group 

 in the absence of the dark pleural stripe. There is a female 

 specimen of C praepotens (Wied.) in the British Museum 

 from Java, which is amply distinct from all the species of 

 the brobdignagius group : the praescutum has four distinct 

 dark stripes ; the wings, apart from the yellowish stigma, 

 are uniformly greyish, without a trace of darkening on vein 

 Cu. Doubtless a number of species have been confused 

 under the name pr(Epotens, and its range is not likely to be 

 so extensive as has been supposed. The specimen recorded 

 by Walker from Nepal is not this species, but apparently 

 C. dives (Brun.) or a very closely allied species; another 

 example in the British Museum labelled prcepotens is in 

 reality C. fulvolateralis (Brun.) (? = sikkimensis. End.). 

 Both these species belong to the brobdignagius group. 



Ctenacroscelis clavipes, sp. n. 



Head rather deep ochreous above, dark grey behind the 

 eyes ; pale ochreous beneath ; sides of rostrum dark brown ; 



