SARCOPHAGA., 267 
The following table is based upon the species here described only :— 
1. Dorso-central bristles * distinct. (Tab. VII. fig.2.) . . . . . . 2. 
Dorso-central bristles absent or inconspicuous among the dense pilosity 
of the thorax, at most a few longer bristles immediately before the 
hind border of the thorax. (Tab. VII. fig. 10.) . . . . . . . 28 
2. Some of the veins of the wings with a row of short bristlest . . . 3. 
All the veins bare, or some bristles at the base of the third vein only . 22. 
3. First and third veins with a row of short bristles . . 2... 0. 4 5% 0% 0" 
First vein bare, the third only with a row of bristles . . . . . ll. 
4. Thorax and scutellum bluish-grey; the femora and tibiz densely 
clothed with long hairsinthe @ . . 6. FJ? . . «x villipes. 264 
Thorax and scutellum cinereous (not bluish) ; legs not hairy (i in S. rufi- 
tibia the hind tibiz only with long hairs) . 5. 
5. Front on the vertex (¢) at least as broad as the eyes . 6. 
Front on the vertex (¢) narrower than the eyes . oe 7. 
6. Hind border of the third abdominal segment with three or four lateral 
macrocheetz; hind tibize rufous, the inner side with long hairs in 
thed ... woe . 2 we SOM rufitibia, 270 
Hind border of the third abdominal segment with two rateral macro- 
cheetee only ; legs black, the hind tibie not hairy .SfhS¢~. . vagabunda. +10 
7. Wings with a distinct costal spine ; apical cell narrowly “opened 5-@3"%“acanthoptera. 2.7 | 
— Costal spine of the wings very short or absent; apical cell opened as 
usual. ww ee ee ee ee ee ee ee 8B 
8. Abdomen yellowish-cinereous, with black spots in three rows . . . 9. 
Abdomen black and grey spotted. . . . . . 10. 
9. Inferior part of the cheeks equalling one- third of the ‘longitudinal 
diameter of the eyes; larger species (6 millim.) . . . . 2"'"~ . wanthopyga. 7-7 | 
Inferior part of the cheeks equalling one-fourth of the longitudinal 
diameter of the eyes; smaller species (4-5 millim.) 4579 .""Y .  .  conjungens. 27-2. 
10. Anal segment concolorous with the preceding segments HS-lem oe. stellata. ATU 
Anal segment reddish at the hind border . . . » . «© © + + +k surrubed. 27% b Saw ~ 
11. Hypopygium (¢) black or greyish . . 2... ee ee ee 
Hypopygium red or yellow. © «© «© © 2 ee ee ee eee WS 
* Dorso-central bristles are the dorsal bristles on the thorax, arranged in longitudinal rows, usually of two 
bristles before and three behind the transverse suture. See Osten Sacken, Essay on Comparative Chetotaxy, 
in Trans. Ent. Soc. Lond. 1884, p. 509. 
+ These short bristles, or rather bristly hairs, are very minute, though conspicuous when viewed ‘under a 
lens and by turning the object in different directions. On the first vein the row of bristles is extended over 
nearly the whole length of the vein, its terminal portion, which is curved upwards to the costa, alone remaining 
bare. On the third vein the bristles are confined to the portion between the base and the small cross-vein, 
and often do not fully reach this cross-vein. Even when a row of bristles along the veins is absent, there are 
almost always some bristles at the base of the veins, especially at the base of the third vein. 
2m 2 
