ASHMEAD: classification of the CHALCIl) FLIES 345 



TABLE OF TRIBES. 



Tarsi 5-jointed Tribe I. Apheliniui. 



Tarsi 4-jointed Tribe II. Pteroptricini. 



Tkh-.e 1. Ajiliciiniiii. 

 The five-ioiuted tarsi distinguish the tribe. The majority of the species con- 

 fine their attacks to various genera of scale-insects, or bark-lice, belonging to the 

 family Coccuhi'. A few, however, in the genus Aphelinus, while usually bred from 

 Coccidx, also attack plant-lice belonging to the family A2jhididi)s. All the species, 

 except probably the latter, which may be hyperpai-asitic on some Encyrdnse, are sup- 

 posed to be primary parasites, and are of the greatest importance in destroying the 



destructive Ijark-lice (Cbccufe). 



table of genera. 



1. Females 



Males^ 19 



2. Wingless forms 1^ 



Winged. 



Front wings ivith a bairless oblique line extending from the marginal vein towards the base of 



the wing ; anteunse 5- or 6-jointed 12 



EYont wings without such a line. 



Antenme 8-jointed ' 3 



Antenufe 3-jointed H 



3. Club of antennae 3-jointed ■* 



CluT) of antennae 1- or 2-jointed 8 



4. Wings with a short marginal fringe '^ 



Wings with a long marginal fringe " 



5. Stigmal vein short but distinct, always present. 



Marginal vein as long as, or longer than, the subcostal vein C> 



Marginal vein much shorter than the subcostal vein. 



Prospalta Howard (type /'. murtfeldti How.). 



6. Flagellum strongly compressed, the first joint of the funicle about twice as long as the pedicel, the 



following shortening ; hind tibi:e flat, with short stiff bristles behind. 



Aneristus Howard (type A. ceroplastx How.). 

 Flagellum not compressed, subcyliiidrical, the first joint of funicle not twice as long as the pedicel . 

 hind tibia normal, without short, .still' bristles behind. 



Coccophagus Westwood (type C. jmlchellus Westw.). 



7. Stigmal vein absent Aspidiotiphagus Howard (type Coccophagust citrinus Craw.). 



8. Club of antennae 2-jointed ^ 



Club of antennte 1-jointed 1^ 



9. Abdomen, seen from above, short, oval, depressed, beneath boat-shaped or carinate ; hind tibiae nor- 



mal Encarsia Foi-ster (type E. tricolor Forst.). 



Abdomen, seen from above, subovate, flat, beneath subcouvex ; hind tibiae behind armed with stiff 



bristles Myiocnema Ashmead (type M. comperci Ashm.). 



10. Abdomen short, depressed, not l)oat-shapod beneath, ending in a prominent ovipositor. 



Ablerus Howard (type Centrobia disiocampx Ashm.). 



