AMERICAN Dll-l I i: i. 



337 



Pachyneurella venata Aid. On dead sheila ill. 1 1. Smith). 



Platyphora lubbocki Verrall. Myrmecophilous (Verrall). 



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



Psyllornyia testacea Lw. Myrmecophilous with Dorylus. 



Commoptera solenopsidus Brues. Myrmecophilous with Solenopsis geminata 



iP.ru. si. 

 Ecitomyia wheeleri Brues. Myrmecophilous with Eciton. 

 .aSnig-matias blattoides Meinert. Myrmecophilous (Meinert . 

 Acontistoptera melanderi Brues. Myrmecophilous with Eciton opacithorax. 

 Xanionotum hystrix Brues. Myrmecophilous with Eciton spp. 

 Puliciphora lucifera Dahl. On flowers of gianl 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 arc 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 b'. 



3. Costal vein and front destitute of setae Gymnophora.3» ' • 



Costal vein and front provided with stout set;e 4. 



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



outer side near the base ■ '••••. o. 



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



hard and polished Apoeeplialus. 3 ' 



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



Aphioolueta. 



5. Mediastinal vein present, proboscis normal, not greatly elongated. • IMiora. 3?J 

 Mediastinal vein obsolete, proboscis of female very long and slender, pnlvilli 



absent or obsolete Dorniphora. 3 b~l . 



6. Front wholly destitute of bristles Platyphora. 3 K' 



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 the 



outer side near the base 9. 



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



Anterior frontal setae absent, third antenna! joint spherical, legs with no 



bristles except tibial spurs Chonocephalus, male. 



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



side Triiieura.3f5~ 



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

 apex 10. 



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

 sented in North America beiiitf printed in heavier type. 



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



