CLUSIIDAE (HETBRONEURIDAB) AND SAPROMYZIDAE . 207 



Key to Species. 



1. A small but distinct intra-alar bristle on mesonotum (Subgenus 



Mineltioides Mallocb) . . . . ■ . . . . . . . .2 



No distinguishable intra-alar bristle (Subgenus Homoneum van der 



Wulp) 4 



2. Abdomen with two series of deep black, round spots, one pair on 



each tergite from second, or third, to sixth inclusive ; ^ hypo- 



pygium yellow ............. 3 



Abdomen with three series of black, more or less angular spots, 

 lateral spots connected with a black hind marginal fascia which 

 extends to, or almost to, extreme lateral margin of tergites 3 to 

 6 inclusive, spots sometimes enlarged to form three broad black 



vittae ; hypopygium of (J black or fuscous .... nigricauda, sp. n. 



3. Fore femur without a series of stifE black spinules on apical half of 



antero-ventral surface ........ apiseriata, sp. n. 



Fore femur with a series of stifi black spinules on apical half of ante- 



roventral surface ......... setulosa, sp. n. 



4. No well-developed acrostichal bristles in front of prescutellar pair ; 



thorax largely grey ........ hawaiiensis Mai loch. 



One or more pairs of well-developed acrostichal bristles in front of 



prescutellar pair ............. 5 



5. Shining black species, anterior margin of frons reddish, abdomen 



glossy black ; halteres with fuscous knobs .... anthracina, sp. n. 

 Shining yellow species, only black markings consisting of some black 

 spots on apical half of dorsum of abdomen, usually three on 

 fifth and two on sixth tergite, with more rarely three much 



fainter ones on fourth ; halteres yellow ..... acrostichalis de Meijere, 



6. Homoneura acrostichalis de Meijere. 



This species is readily distingmshable from its allies by the presence of a 

 fringe of closely placed, small black setulae along the sides of the sixth abdominal 

 tergite, on the extreme edge, in the ^. The fore femur has the usual series of 

 very small black spines on the apical half of the anteroventral surface, a 

 character which distinguishes the species in both sexes from others of similar 

 general appearance occurring in the same region, several of these lacking the 

 series which is normally present in this genus throughout the Orient. 



Tutuila : Amauli, 9.vi.l923 (Swezey and Wilder) ; Pago Pago, 18.iv. 

 (Kellers). Upolu : Apia, 27.V.1924 (Bryan). Manua : Tau, 20.V.1926 (Judd). 



H. acrostichalis also occurs in the Dutch Indies, and Formosa. 



