R. W. CROSSKEY 



Vibrissae usually inserted about on a level with the epistomal margin (if distinctly- 

 above then other characters not fitting or doubtfully so). Various complements 

 of dc setae. Inner posterior angle of lower calypter usually rather rounded and 

 inner margin of the calypter often not closely following the edge of the scutellum. 

 <J without a close-set very regular hind tibial ad fringe and rarely with hair fascicles 

 on the venter of T 4 ERYCIINI (p. 134) 



Tribe ACEMYINI 



This is a small tribe whose members are apparently confined to orthopterous 

 hosts, particularly acridid grasshoppers. The tribe is provisionally retained in 

 the Goniinae, but certain features (especially the male genitalia) suggest that it 

 would be more appropriately placed in the Tachininae s.l. Mesnil (1962) and 

 Crosskey (19736) are the most recent authors to detail the principal characteristics 

 of the adults. Four genera are here recognized as occurring in the Oriental Region, 

 but one of these, Charitella Mesnil, is only tentatively included in the Acemyini 

 (its male and host relations are unknown). Mesnil (1962 : 780) placed Charitella 

 near to the acemyines but actually associated with Neomintho Brauer & Bergenstamm 

 in the neominthoines, but the general appearance of Charitella is rather more that 

 of Acemya than of Neomintho and it is here preferred to include Charitella in the 

 Acemyini (pending reassessment when the hosts or the male are discovered); the 

 wing venation of Charitella is very similar to that of Eoacemyia (cf. Text -figs 98 & 

 99). It seems likely that the Afro-Palaearctic acemyine genus Metacemyia Herting 

 might occur in the Oriental area, though not yet found there, and it has therefore 

 been included in the following key. 



Although Acridoidea are well known to be the hosts of Acemyini there are as 

 yet very few records for the Oriental Region. Ceracia aurifrons is reported to 

 parasitize Locusta migratoria L. and other acridids in the Philippines (references 

 in Greathead, 1963) and Eoacemyia errans to attack acridids in Malaya. In Aus- 

 tralia Ceracia fergusoni Malloch attacks many species of Eumastacidae as well 

 as Acrididae (host list in Crosskey, 19736 : 172). 



Key to Oriental Genera of ACEMYINI 



1 Prosternum setulose. Hind tibia without a pv apical seta. Head of q* with or 



without proclinate orbital setae .......... 2 



- Prosternum bare. Hind tibia usually with distinct pv apical seta. Head of $ 



without proclinate orbital setae .... ACEMYA Robineau-Desvoidy 



2 Two post dc setae. Ground colour of abdomen mainly tawny yellow, only dark on 



most of T5 and in a narrow median vitta on other tergites. $ with a small down- 

 wardly directed hook-like ovipositor .... CHARITELLA Mesnil 



- Three post dc setae. Ground colour of abdomen entirely dark, black or very dark 



brownish. $ without such a modified ovipositor ...... 3 



3 Humeral callus with three setae (innermost one sometimes weak). Both sexes with 



proclinate orbital setae (usually several pairs). Cell R 5 usually short -petiolate or 

 closed just before wing margin, very rarely narrowly open .... 4 



- Humeral callus with two setae. 6* without proclinate orbital setae, $ always with 



only two pairs. Cell i? 5 well open at wing margin . . EOACEMYIA Townsend 



