AMERICAN DIPTEKA. 



337 



Pachyneurella venata Aid. On dead shells (H. H. Smith). 



Platyphora lubbocki Verrall. Myrmecophilous (Verrall). 



Melaloncha (?) formicarum Verrall. Myrmecophilous (Verrall). 



Psyllomyia testacea Lw. Myrmecophilous with Dorylus. 



Commoptera solenopsidis Brues. Myrmecophilous with Solenopsis geminata 



(Brues). 

 Ecitomyia wheeleri Brues. Myrmecophilous with Eciton. 

 JEnigrnatias blattoides Meiuert. Myrmecophilous (Meinert). 

 Acontistoptera melanderi Brues. Myrmecophilous with Eciton opacithorax. 

 Xanionotum hystrix Brues. Myrmecophilous with Eciton spp. 

 Puliciphora lucifera Dahl. On flowers of giant Arum that smell like carrion. 

 Wandolleckia cookii. On land molluscs (Achatina), Cook. 



It is evident, therefore, that the larvae of many species live in 

 decaying matter of a vegetable and animal nature; others are myr- 

 mecophilous, while a few have been observed as true parasites. 



TABLE OF GENERA.* 



1. Wings fully developed 2. 



Wings absent or much reduced in size and venation 14. 



2. Third longitudinal vein forked near apex 3. 



Third longitudinal vein simple, at most thickened at apex (J. 



3. Costal vein and front destitute of setae Gij miiopliora. 



Costal vein and front provided with stout setae 4. 



4. Anterior frontal setae recliuate, middle tibia? with one or more setae on the 



outer side near the base • • • 5. 



Anterior frontal setae recliuate, middle tibiae destitute of such setae, ovipositor 



hard and polished Apoceplialus. 



Anterior frontal setae proclinate, middle tibiae destitute of such setae. 



Apliiot'liteta. 



5. Mediastinal vein present, proboscis normal, not greatly elongated. I'liora. 

 Mediastinal vein obsolete, proboscis of female very long and slender, pui villi 



absent or obsolete Dorniphora. 



6. Front wholly destitute of bristles Platyphora. 



Front provided with bristles 7. 



7. First longitudinal vein wanting Ecitomyia male. 



First longitudinal vein present as usual 8. 



8. Anterior frontal setae reclinate, middle tibiae with one or more setae on tin- 



outer side near the base 9. 



Anterior frontal setae proclinate, middle tibiae without such setae 12. 



Anterior frontal setae absent, third antennal joint spherical, less with no 



bristles except tibial spurs Chonocephalus, male. 



9. Velvet black, middle tibiae of the male with a row of long setae on the upper 



side Trinenra. 



Not velvet black, middle tibiae with only two or three setae besides those at 

 apex 10. 



* Genera from all parts of the world are included in this table, the ones repre- 

 sented in North America being printed in heavier type. 



TRANS. AM. ENT. SOC. XXIX. (43) OCTOBER, 1903. 



