52 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 68 



with leucocepJiala, since the only differences detected in those two 

 species occurs in a region markedly different in the two sexes. 



METOPIA CAMPESTRIS (Fallen) 



Tachina campestris Fall^in, Dipt. suec. Muse, col. 8, p. 12, 1820. — Bezzi 

 and Stein, Kat. Pal. Dipt., vol. 3, pp. 510-511, 1907. Contains many 

 references in European literature for which there is not space in this paper. 



Tachina amabilis Meigen, Syst. Beschr., vol. 4, pp. 374, 232, 1834. 



Ophelia cinerea Robineau-Desvoidy, Myod., p. 121, 1830. 



Ophelia gracilis Robineau-Desvoidy, Myod., p. 121, 1830. 



Ophelia lutescens Robineau-Desvoidy, Myod., p. 121, 1830. 



Metopia flavescens Macquart, Soc. Sci. Lille, 1833, p. 285, 1834. 



Metopia crassicornis Ferris, Soc. Linn. Lyon, 1852, p. 63. 



Metopia staegeri Rondani, Dipt. Ital. Frodr., vol. 3, p. 210, 1859. 



Ophelia caesia Robineau-Desvoidy, Dipt. Envr. Faris, vol. 2, p. 96, 1863. 



Ophelia demissa Robineau-Desvoidy, Dipt. Envr. Faris, vol. 2, p. 98, 1863. 



Male. — Front at narrowest 0.30 of head width (measurements of 

 five 0.29, 0.30, 0.30, 0.30, 0.31) ; front, face, and bucca gray pollinose 

 with dark reflections when viewed from below; inner orbits strongly 

 approximated at base of nntennae, diverging widely towards vertex 

 and bucca; frontal vitta black, diverging moderately toward the rear, 

 about twice width of either parafrontal at level of lowest orbitals; 

 about ten bristles in frontal row, which extends to middle of second 

 antennal joint; parafrontals moderately pilose, with the black bristly 

 hairs extending downward to insertion of arista; vibrissa'e level with 

 front edge of oral margin; facial ridges with two or three bristles not 

 extending above the lowest fourth; antennae black, extending to half 

 the length of second antennal joint from vibrissae; third joint five to 

 seven times as long as the second; arista thickened on basal two-fifths; 

 in profile, bucca equals one-eighth eye height and is subequal to para- 

 facials at narrowest point, front projects about one-third eye diam- 

 eter; parafacials bare save for row of strong macrochaetae extending 

 downwards to level of uppermost bristles on facial ridges; palpi 

 black, much larger than thickened part of arista. Thorax thinly 

 gray pollinose over black, with two narrow median and two broad 

 lateral vittae before the transverse suture, and three broad vittae 

 behind the suture which are obscurely continuous over the scutellum; 

 the apical and lateral pairs of marginal scutcllar bristles equal and 

 both smaller than the intermediate marginal pair; small preapicals 

 present. Abdomen shining black, with broad, reflecting, bronze- 

 tinged gray pollinose bands on basal two-thirds of the last three seg- 

 ments; intermediate segments with a median vitta and usually with 

 large V-shaped indentations in the pollinose bands on either side, 

 when viewed from rear; first and second segments each with a strong 

 median marginal pair of bristles; third and fourth each with unin- 

 terrupted marginal row of about ten bristles. Genitalia (pi. 1, fig. 2) 

 black; in repose extruding but slightly from the fourth abdominal 



