236 A. L. MELANDER. 



cous. Wings hyaline, the first basal cell longer than the second, stigma obscure. 

 Autennse and proboscis white. 3 mm. 



District of Columbia. 



The described specimen is immature. 



Heineroclroinia superstitiosa Say. 

 Say, Complete Writings, i, 256. 

 Long's Espedit., ii, Append., 376. 

 Wiedemann, Ausseur. Zweifl. Ins., ii, 11, I. 



Whitish, thorax and abdomen with a broad black vitta ; antenute, proboscis 

 and vertex white, lower part and back of head piceous. The vitta is lighter in 

 color medially. Scutellum with paler margin. On the abdomen the vitta may 

 be constricted to a row of spots. Wings hyaline. Halteres and legs white. 4 mm. 



Northwest Territory, not northwest Penn. (cf. Wiedemann). 



Henierodroniia rogatoris Cuquiliett (Fig. 65). 

 Proc. Nat. Mus., 1896, p. 392. 



Head black; thorax, scutellum, metanotum, pleurae and sternum light red. 

 Abdomen in middle of dorsum brownish red, the seventh segment wholly light 

 yellow. Hypopygium large, projecting both above and below the abdomen, red- 

 dish brown. The large blunt tubercle near the base of the front femora bears on 

 its summit a stout spiue directed obliquely forward. 4 mm. 



North Carolina (Coquillett), Wisconsin, Wyoming (Wheeler). 



Of the specimens in the collection the hypopygium is black, with 

 an erect basal filament. No thoracic macroch?etEe are present. The 

 eyes are as in empiformis Say, widely separated above the antennae 

 and very narrowly in the middle below. A mutilated specimen 

 from Louisiana (Pilate) resembles these in the parts remaining. It 

 has, however, strong black bristles on the underside of the front 

 femora. 



Hemerodroinia eiupitbrinis Say. 

 Ochthera empiformis Say, Compl. Writ., ii, 85. 

 Hemerodromia vittata Loew, Cent., ii, 56. 



" sp. innominata Williston, Trans. Ent. Soc. Lond., 1896, p. 440. 



(?) Tachydromia oratoria Fallen, Empid., 13. 



In regard to this species there is another entomological muddle, 

 the following solution of which seems the most practicable. The 

 species was described by Mr. Say as an Ochthera, but, as Dr. Loew 

 pointed out, it probably is a Tachydromine. It is put in Osten 

 Sacken's catalogue in the genus Hemerodromia, as a synonym of 

 vittata Loew. In the Diptera of St. Vincent, Professor Williston 

 describes a Hemerodromia from' that island, which he suggests is the 

 same as Say's species, and probably the same as H oratoria Fallen. 



