304 DIPTERA. 
1. Hemichlora vittigera. (Tab. VII. figg. 21,¢ ; 21, head in profile.) 
Cyrtoneura vittigera, Bigot, Bull. Soc. Zool. Fr. 1887, p. 613 (d)’. 
Cyrtoneurina vittigera, Gigl.-Tos, Mem. R. Accad. Scienze di Torino, ser. 2, xlv. (sep.) p. 13 (2) 
Thoracic dorsum brown, with four black stripes before the transverse suture, the interspaces between which 
are whitish-grey; pleure testaceous. Face, cheeks, and lateral front-margins rufous, with white 
reflections ; frontal band of the Q obscure rufous. Antenne, proboscis, palpi, and legs yellowish-rufous. 
Scutellum brown, laterally black. First: and second abdominal segments testaceous, slightly transparent ; 
the following segments metallic-blue. Tegule testaceous. Wings with a yellowish-brown tinge. 
Length 8°5 millim. 
Hab. Mexico12, Amula in Guerrero 6000 feet (H. H. Smith); Guatemaua, San 
Gerénimo (Champion). 
2 
. 
Two female specimens. A third female, from the latter locality, is evidently 
immature and not fully coloured. This was perhaps the case with the male specimen 
described by Bigot, as he says!: “wholly pale rufous, except the posterior segments 
of the abdomen, which are obscure violet,” and “ wings very pale yellowish.” 
MUSCINA. 
Muscina, Robineau-Desvoidy, Essai sur les Myodaires, p. 406 (18380). 
In Muscina, as in the two preceding genera, the apical cross-vein is reduced to a 
rather short curvature near the termination of the fourth vein, and the apical cell is 
widely opened at the tip of the wings. From Myiospita it differs in having no pilosity 
on the eyes ; from Hemichlora in having the arista plumose on the underside, as well as 
on the upperside, and in the total absence of metallic coloration on the abdomen. 
The genus Muscina forms the second section of Cyrtoneura in the sense of Schiner’s 
‘Fauna Austriaca,’ Diptera. 
1. Muscina linea, sp.n., ¢ 2. (Tab. VII. fig. 22, ¢ .) 
Testaceous ; thoracic dorsum cinereous, with dark lines; second abdominal segment with a blackish dorsal 
stripe; third and anal segments blackish ; antennz, palpi, and legs rufous. 
Length 8 millim. 
Head rufous, with silvery reflections; frout of the g forming a small triangle, the eyes being coalescent, that 
of the 2 as broad as the eyes, with parallel sides, pale rufous-grey ; frontal bristles weak, in the g on 
the frontal triangle only. Face perpendicular ; vibrisse inserted nearly at the oral margin, which is 
slightly prominent; above the vibrisse some short bristles ; cheeks narrow, their inferior part linear in 
the ¢, equalling one-sixth of the longitudinal diameter of the eyes in the 2, in both sexes with some 
black bristles ; beard yellow. Facets of the eyes somewhat larger in the ¢ than in the 9. Antenne 
yellowish-rufous, inserted on the median line of the eyes; basal joints with a bristly hair; third joint 
from two to three times as long as the second; arista brown, longer than the antenna, thickened at the 
base, thinly plumose. Proboscis and palpi yellowish-rufous, the proboscis sometimes partly brown ; palpi 
flattened, in the 9 much broader than in the ¢. Thorax, scutellum, and abdomen yellowish-testaceous ; 
thoracic dorsum cinereous, with four blackish stripes, the two median linear, the stripes becoming more 
confused behind the transverse suture ; dorso-central bristles behind the suture to the number of four in 
each row. Abdomen ovate or cordiform, broader than the thorax; first and second segments slightly 
transparent; on the second a blackish dorsal line; third and anal segments blackish-brown, the third 
