NORTH- AMERICAN DIPTERA. 247 



balzaga (Cattilogue, etc., p. 128) regards >S. tfubalba Walker as a 

 mere variety of >S'. mutahilis. But is Schiner right? and is S. sub- 

 alba Arrib. the same as *S'. subalba Bell. ? meanwhile I cannot be- 

 lieve, until we have pi-oof of the contrary, that the four male speci- 

 mens before me are a mere vai'iety of S. mutabilis." 

 I have not seen this species. 



Stratioinyia goniphora Say. 



Strdtiomi/s fioniphora Say, Joui'. Acad. Nat. Sci. Pliila., vi. 161 ; Coiiipl. Wi'. 

 ii, 356. 

 " Black. Thorax with minute golden hairs; beneath greenish. Head yellowish 

 white, two undulated, black, frontal bauds; vertex black, yellowish behind ; 

 hypostoma with a lateral black dot, sometimes obsolete ; proboscis black. An- 

 tennae black, occiput black. Thorax with numerous small golden hairs ; a yel- 

 lowish line over the wings; scutel black, posterior margin and spines yellow. 

 Wings hyaline, costal nervures and cellule yellowish; middle nervures blackish, 

 tergum black, with lateral yellow triangles and tip ; beneath pale greenish, pectus 

 on the disc black ; feet yellowish, a line between the thighs black ; venter on the 

 posterior disc ferruginous (Say). Length more than three-tenths of an inch. 



" Inhabits Mexico." 



Straf iomyia robusta Walker. 



Stratiomys robusta Walker, List, v, 37. 



Nigra: oculi testaceo exparte marginati; antennae capite duplo longiores; scu- 

 'tellum margine postico spiuisqne "flavis; abdomen crassum, marginihus vitta 

 apicali ventreque llavis, hac fascius tribus abbreviatis nigris; pedes flavi, femori- 

 buc nigris, tibiis nigro cinctis ; alae fuscae, apice linipidae ; halteres flavi. 



Feni. — Black. Head testaceous about part of the eyes. Antennae about twice 

 the length of the head ; first joint full six times the length of the second. Thorax 

 clothed with pale down ; hind border and spines of the scutellum yellow. Ab- 

 domen convex, very thick, yellow along the sides, and with a yellow stripe on 

 the apical segment ; underside yellow, with three broad, black bands, which are 

 much abbreviated on each side. Legs yellow ; femora black ; a black band on 

 each tibia. Wings brown, with limpid tips; veins piceous; halteres yellow 

 Length of the body 5 lines ; wings 10 lines. 



North America (Walker). 



Stratiomyia nigrifroiis Walker. 



Stratiomys nkjrifrons Walker, List, iii, 531. 



'■ Mas. — Nigra ; scutelli margine postice flavo, abdominis lateribus maculisque ad 

 apicem duabus flavis, ventris fasciis flavis, antennis pedibusque nigris, tibiis apice 

 tarqu fulvis. alls fuscis. 



" Body black. Head as broad as the chest, clothed with tawny hairs ; eyes 

 black ; a small part on each side composed of very small facets ; mouth and feelers 

 black; chest and breast clothed with dark tawny hairs; hind border of the scut- 

 cheon yellow, armed with two tawny spines. Abdomen nearly oval, a little 

 broader and longer than the chest, thinly clothed with short tawny hairs, yellow 

 on each side, and adorned with a yellow spot on each of the last two segments ; 



TKANS. AM. ENT. SOC. XXII. JULY, 1895. 



