AET. 10 NORTH AMERICAISr TACHINID FLIES WEBBER 3 



true discals, but with only submarginal or subdiscal macrochaetae. 

 The type of Masiceropsis is Masicera pauciseta Coquillett, the type 

 specimen of which is a female from California, a small fly with 

 shrunken third antennal joint, parallel scutellar bristles, and weakly 

 ciliated hind tibiae. It is accompanied by two males from the same 

 localit}^ (Los Angeles County) and all are undoubtedly the same 

 species. This material, while not identical, is certainly inseparable 

 generically from the archippivora complex on any stable characters. 



The genera Eiicelatoria, Pseudoviyothyria^ Frontiniella^ Ptycho- 

 myia, Prosopalaea^ and Azygohothria are all closely allied to Achae- 

 toneura but distinct from that genus as here circumscribed. 



Characters of Achaetoneura. — Eyes bare, at most with slight 

 pubescence; facialia bristly at least one-half way; ocellar bristles 

 present and directed forward, approximate at base and not especially 

 divaricate; antennae reaching lowest fourth of face; third joint 

 broad, roimded at apex, never tapering to a point; second joint 

 usually short, sometimes elongate; frontal bristles extending below 

 base of third antennal joint; front without evenly paired reclinate 

 bristles outside of frontal row midway between lowest ocellus and 

 base of antennae ; arista bare ; paraf acials bare ; face slightly reced- 

 ing ; vibrassae at oral margin ; bucca bristly ; palpi yellow, well devel- 

 oped; proboscis short and fleshy. Thorax with well-developed 

 bristles; four postsutural dorsocentrals, four sternopleurals ; ptero- 

 pleural bristle small ; apical scutellar bristles present, usually erect 

 and cruciate; abdomen pollinose, never with ventral carina, sharp 

 piercer, or true discal macrochaetae ; median marginal bristles pres- 

 ent or absent on first and second segment. Hind tibiae evenly ciliate, 

 with or without a longer bristle. Wing with normal venation, first 

 posterior cell open, ending considerably before apex of wing; last 

 section of fifth vein never one-half as long as preceding; veins bare 

 excepting base of third. 



Method of reproduction. — Practically all of the species deposit 

 maggots which are ready to hatch, in choria on the body of the host, 

 although, according to AUen,^ aletiae has developed the habit of 

 subcutaneous larviposition. 



Type of pupariwn. — So far as known, all of the species have 

 smooth puparia, without spinelike hairs, and with the spiracular 

 slits serpentine. 



LIST OF HOST SPECIES 



In citing the following host species, mention is made of only those 

 whose record has been reviewed and the bred specimen examined. 



» Trans. Amer. Ent Soc., vol. 52, p. 188, 1926. 



