84 R. W. CROSSKEY 



setae. Second costal sector haired ventrally. Hind tibia with a distinct pd 

 preapical seta in addition to the normal ad and d preapicals. Humeral callus 

 with three setae standing in a triangle. <§ with two pairs of proclinate orbital 

 setae (like the $) LIXOPHAGA Townsend 



7 Eyes bare. Parafacials finely and sparsely haired. Facial ridges finely setose on 



lower two-fifths or half. Mid tibia with two ad setae PAREUPOGONA Townsend 



- Eyes densely haired. Parafacials bare. Facial ridges with strong downcurved 



setae on most of their height. Mid tibia with one or two ad setae ... 8 



8 Mid tibia with one submedian ad seta. 3 + 4 dc setae. Abdominal Ti -f- 2 



excavate to its hind margin. Humeral callus with the three main setae standing 



in line. Infrasquamal hairs absent ........ 9 



- Mid tibia with two ad setae. 3 + 3 dc setae (supernumerary fourth post dc 



occasionally present between the normal first and second post dc setae). 

 Abdominal Ti -f- 2 with excavation clearly not reaching hind margin. Humeral 

 callus with the three main setae standing in a triangle. Infrasquamal hairs 

 present LECANIPA Rondani 



9 Three sternopleural setae. Tergites of 9 abdomen compressed to form a mid ventral 



abdominal keel bearing stubby spinules. 9 with ovipositor in form of a strong 

 downcurved hook-like piercer ..... COMPSILURA Bouche 



- Two sternopleural setae. Tergites of $ abdomen normal. $ without externally 



visible piercing ovipositor ..... Undetermined genus [? gen. n.] 



10 2 + 3 dc setae. Two sternopleural setae. Eyes bare. Parafacials fully haired. 



Intermediate abdominal tergites with discal setae . . DELTOMYZA Malloch 



- Dorsocentral setae 3 + 4 or 3 + 3 (rarely 2 + 4). Three sternopleural setae 



(except sometimes in Zoster omeigenia) . Eyes bare or haired. Parafacials haired 

 or bare, or partially haired. Intermediate abdominal tergites without discal 

 setae (except in Paropsivora) ......... 11 



11 Three post dc setae. Abdomen of $ with a fascicle of long dense hair on each side 



of T5 (last visible tergite). Parafacials mainly or totally bare, if haired then 

 hairing confined to area immediately below lowest frontal setae . . . 12 



- Four post dc setae. Abdomen of £ without dense hair fascicles on T5. Parafacials 



completely haired or at least haired on uppermost quarter or third . . . 13 



12 Fore tibia with two pv setae. Mid tibia with two ad setae. Intermediate abdominal 



tergites with discal setae. Humeral callus with four setae (basal row of three 

 in which median one weakest, and a fourth seta set forwards of the basal row 

 and stronger than middle seta of the basal row). Bend of vein M strongly 

 abrupt. Eyes haired. Prosternum haired . . . PAROPSIVORA Malloch 



- Fore tibia with one pv seta. Mid tibia with one ad seta. Intermediate abdominal 



tergites without discal setae. Humeral callus with only two strong setae, 

 sometimes a rather weak third seta. Bend of vein M not strongly abrupt. 

 Eyes bare [haired in an undescribed New Guinea species]. Prosternum bare 

 [haired in undescribed New Guinea species] . ZOSTEROMEIGENIA Townsend 



13 Facial ridges bare (except for the usual few setulae immediately above the vibrissae). 



Eyes bare or haired. £ with the usual well developed outer vertical setae. 

 Vibrissae conspicuously above the level of the epistomal margin (except in 

 Zenargomyia) ............ 14 



- Facial ridges strongly setulose up most of their height. Eyes densely haired. 



9 without outer vertical setae [character in need of confirmation as very few 

 Pilimyia females seen]. Vibrissae inserted only slightly above the level of the 

 epistomal margin ........ PILIMYIA Malloch 



14 Vibrissae inserted only very slightly above the level of the epistomal margin. 



Eyes bare. Parafacials bare except on the uppermost quarter or third (Text-fig. 

 49). Ocellar setae very strong. Apical scutellar setae rather strong and crossed 



ZENARGOMYIA Crosskey 



