ORTALID.E — PYROOTA. 77 



work, which is appended to his fourth supplement, 0. maculi- 

 pennis is omitted. The cause of this omission is not apparent. 

 Should Macquart have discovered that it belonged to a different 

 genus, he would have transferred it to that genus; but the species 

 is altogether omitted in the list. 



Observation 2. — Sphecomyia valida of Harris's Catalogue of 

 the Insects of Massachusetts, is, according to a communication 

 from Baron Osten-Sacken, nothing else but Pyrgota millcpunc- 

 tata. As a matter of course, Harris's name, being merely a 

 catalogue name, has no claim of priority. 



2. P. u it data Wied. % J • — Ex ochraceo ferruginea ; antermarum 

 articulus tertius secundo aequalis ; seta antennalis triarticulata, articulis 

 primis duobus subsqualibus ; alarum vena longitudiualis secunda 

 appendiculata. 



Yellowish-ferruginous; the third antennal joint equal to the second in 

 length ; arista three-jointed ; its first two joints of nearly equal length ; 

 the second longitudinal vein with a stump of a vein upon it. Long. 

 corp. % 0.4—0.43; $> cum terebra 0.5— 0.53 ; long. al. 0.5— 0.58. 



Syn. Pyrgota undata Wied. Auss. Zweifl. II, p. 581. Tab. X, 6. 



Pyrgota undata Ma< q. Suites, etc., II, p. 423. Tab. XVIII, f. 23 (were 



mentioned after Wiedemann). 

 Myopa nigripennis, Gray, Anim. Kingd. Tab. 125, f. 5. 

 Oxycephalafuscipennis Macq. Dipt. Exot. II, 3, p. 198. Tab. XXVI, 6. 

 Sphecomyia undata Harris, Cat. Ins. Mass. 

 Pyrgota undata Gerst. Stett. Ent. Zeit. xxi, p. 188. 



Yellowish-ferruginous or more ochre-brownish. Front rather 

 broad, projecting almost in the shape of a tower, and with a short, 

 rather inconspicuous pubescence ; without stronger bristles in 

 the region of the vertex or round the place where the ocelli 

 usually are. Antennas yellow; the first two joints with a yel- 

 lowish pubescence; the third sometimes ochre-brown, of the same 

 length as the second. Arista distinctly three-jointed ; the first 

 two joints almost of equal length. The face very much retreat- 

 ing when seen in profile; the very deep antennal foveas reach 

 only to its middle and are separated by a very low ridge, which 

 is usually tinged with brown ; below them, the middle portion 

 of the face is remarkably narrow, groove-like and bordered on 

 each side by a brownish-black ridge. A brown or brownish- 

 black, somewhat curved stripe generally extends frmn the middle 

 of the inner orbit of the eves towards the region of the antennae. 



