76 DIPTERA OF AUSTRALIA, 



minating in second a little before the origin of the anterior branch, 

 consequently the latter not appearing as a continuation of the 

 former. Second posterior cell petiolate. Fifth posterior cell 

 large, its length and width about equal, in punctiforni contact 

 with the discal. 



The remarkably fine insect, for which I am compelled to institute 

 this new genus, is evidently intermediate between the Cte^iophorcn 

 and those Tipulina possessing branched antennae and wanting the 

 nasus to rosti'um, and seems to render a satisfactory division of the 

 genera into groups hopeless. The robust glabrous body, striking 

 colours, 13-jointed branched antennae, stout legs, short tarsi, etc., 

 at once stamp the insect as one of the Ctenophorina, whilst the 

 long glabrous rostrum, perfectly destitute of a nasus, and the 

 position of the anterior branch of the second longitudinal vein 

 remind one of Ptilogyna, Plusioniyia and their relatives, though 

 the structure of the head and direction of the rostrum quite differ. 

 In short, Clytocosmus is more of a Ctenophora than a Tipala, but 

 the question is, should it occupy an isolated position 1 



Having only one specimen of the ^, and the genitalia being in 

 a dried retracted state, I am compelled to postpone an examination 

 of these organs. 



396. Clytocosmus Helmsi, sp.n. (PI. iv., fig. 5.) 



$. — Length of antenna? 0*250 inch ... 6-34 millimetres- 

 Expanse of wings 0-760 X 0-220 ... 19-32x5-58 



Size of body 0-730x0-240 ... 18-54x6-09 



9- — Length of antennae 0-180 inch ... 4-56 millimetres. 



Expanse of wings 0-850x0-250 ... 21-58x6-34 



Size of body 1-060x0-240 ... 26-94x6-09 



Opaque. Entire head, rostrum and first joint of antennae 

 reddish-fulvous ; suctorial labella, palpi, and remainder of antennae 

 black ; ^ antennae with the first 9 flagellar joints having a 

 moderately long branch on each side about the middle, progressively 

 decreasing in length, the tenth joint filiform and with the short 

 terminal joint beset with hairs ; ^ with the first 8 flagellar joints 



