254 A. L. MELANDER, 



Syueches thoracicus Say (Fig. 84). 

 Hyhos thoracicus Say, Compl. Writ., ii, p. 68. 



Antennse and rostrum yellow, pale; thorax ferruginous, with three dilated 

 black lines; wings obscure, a dark red-brown stigma; feet reddish brown, the 

 posterior pair darker than the others, tarsi yellowish; abdomen dull piceous. 

 Rather more than one-fifth of an inch. 



Pennsylvania, Maryland, Virginia, North Carolina, Kentucky, 

 Ohio, Illinois, Kansas. 



Syne<*hes simplex Walker (Fig. 86). 

 Insecta Saundersiana. Dipt., p. 165. 



Body dark brown, clothed with black hairs; eyes red, meeting above; facets 

 large; mouth and feelers tawny; bristles of the feelers black; chest adorned 

 with tawny stripes which are nearly confluent; abdomen linear, rather flat, 

 black, longer and much narrower than the chest; tip dark tawny, shining; legs 

 tawny; thighs and fore shanks partly pitchy; wings pale gray, brownish on the 

 borders of the cross-veins and beneath the brand, which is dark brown ; the wing 

 is yellow on each side of the latter, and there is a dark brown spot beyond it; 

 wing-ribs and veins brown ; poisers large, tawny. 3 mm. 



"United States." 



Massachusetts, North Carolina, Georgia, Ohio, Ontario, Michi- 

 gan, Indiana, Illinois, Wisconsin, 



SYWDYAS Loew. 



Small black species, differing from Syneches and Hybos in that 

 the first section of the fourth vein is almost indistinct, and that the 

 origin of the second vein is still more distant from the base of the 

 wing. 



Only the following species are known from North America. 



Dorsum of abdomen opaque dorsalis Loew. 



Abdomen bronzed black polita Loew. 



Syuflyas dorsalis Loew. 

 Cent., i, 26. 



Wholly black, shining, the back of the abdomen opaque, clothed with fuscous 

 tomentum. Thorax with very short hairs, abdomen with longer whitish hairs; 

 bristles of thorax and scutellum black. Legs black-pilose, posterior tibiae thick, 

 clavate, and posterior metatarsi strongly incrassate. Halteres black. Wings 

 hyaline, veins pale fuscous, second half of the costa blackish. 3.3 mm. 



New York : Illinois. 



Syiidyas polita Loew (Fig. 83). 

 Cent., i, 27. 



Wholly black, shining. Dorsum of thorax with very short pile, abdomen with 

 longer, dirty white pile ; thoracic and scutellar bristles black. Legs black-pilose, 

 posterior tibite thick, moderately clavate, posterior metatarsi moderately incras- 



