﻿AUSTRALASIAN STILT-LEGGED FLIES — STEYSKAL 173 



Subfamily Trepidariinae 



KEY TO THE AUSTRALASIAN GENERA OF TREPIDARIINAE » 



1. Upper part of metanotuin conical and surpassing scutellum. 



Nestima Osten-Sacken 

 Metanotum of ordinary form 2 



2. Middle and hind femora on lower side before the tip with a series of spinules- 3 

 Middle and hind femox-a unarmed below 4 



3. Wings strongly fasciate or tessellate with dark brown; mesotrons shining 



medially, flat and strongly angnlate apically Eurybata Osten-Sacken 



Wings with but indistinct pattern ; inesofrons tomeutose, strongly convex in 

 front and truncate Crosa, new genus 



4. Scutellum turned upward ; head spheroidal ; three fronto-orbital bristles. 



Gongylocephala Czerny 



Scutellum horizontal above ; head somewhat depressed ; wing with third costal 



division more than half as long as ultimate section of fourth vein 5 



5. Middle and hind femora thickened basally ; arista plumose. 



Crepidochaetus Enderlein 

 Middle and hind femora slender ; arista bare to plumose. 



Trepidarioides Frey 



Cothornobata Czerny 



Metopochetus Enderlein 



Of the last three crenera I have seen only one representative, Trepi- 

 darioides territa Osten-Sacken, and I am unable to find good distinc- 

 tive characters in the literature. 



Genus EURYBATA Osten-Sacken 



On examining a series of specimens included in Euinjhata hexapla 

 it became evident to me that Osten-Sacken was correct when, in describ- 

 ing the second species of Eurybata^ E. semilauta^ he stated that later 

 authors might see fit to place it in another genus. Eunjlmta may be 

 distinguished from Crosa^ new genus (p. 176) , which is based upon E. 

 semilauta, as in the foregoing key, by the characters of the head i-ep- 

 resented in figure 74, «, &, and in the male by a lack of long haire on the 

 basal ventral side of the fore femora. The abdomen is shining apicallj' 

 and near the segmental sutures. 



It was also evident that two new species were included with E. 

 hexapla. These species are included in the following key to the species 

 of the restricted genus Euryhata. All species are known only from 

 the Philippine Islands. 



"The genus Mimomyrmecia Frey has been removed from this subfamily (see p. 171). 

 The genera Formicosepsis De Meijere and Cypselosoma Hendel have been referred here 

 by Hennlg (1941), altliough Hennig has later (m litt. Sabrosky, 1949) indicated that 

 Gypselosoma is a clusiid. These two genera may be distinguished from all other Tylidae 

 by the possession of strong vibrissae and ocellar bristles. Calycoptcri/x Eaton, from the 

 Kerguelen and Heard Islands, a fly witli rudimentary wings, has also been referred here 

 by Hennig (1934). 



