THE BIBIONIDA. 157 . 
S. flavicollis, Mg. = S. ochracea, Mg. 
Tawny; head black; antennz at base yellowish; palpi dark 
brown ; thorax tawny; scutellum tawny or brownish ; sides of the 
breast light. Abdomen black above, except the hind borders of the 
segments, anal segment pale brown. Legs light brown; tarsi darker. 
Halteres yellowish. Wings: costal short; first, second, and third 
veins tawny ; the fork of the fourth very long ; petiole short ; trans- 
verse yeinlet small ; sixth scarcely undulating. Lower veins all pale. 
Length 1 to r} lin. ‘This is an autumnal species, and frequents the 
flowers of ivy, and also found with picea.* 
S. Albitarsis, Zett. 
This is a black species, with long body and milky wings, with 
white tarsi. Length 1} to 14 lin. Common. 
S. transversalis, Lw. ° 
Black. The veining of the wings easily distinguishes this fly. 
The second vein short and curved abruptly upwards to the costa ; 
the third undulated, transverse veinlet between them thick; the 
fourth forked, petiole short and fork long, arising nearer the base of 
the wing than the transverse veinlet; the upper prong of the fork 
united to the third by a long transverse veinlet, the prong angu- 
lated at the origin of the veinlet; fifth nearly straight; sixth bent 
abruptly to posterior border and undulated. Length # to 1 lin. 
Verrall records it as occurring freely on a tree near Thetford, June 
17, 1880. 
S. brevicornis, Mg. = S. septemnodia, Schrk. 
Dark black ; antennz very short and deep black ; legs and hal- 
teres also deep black. Wings milky ; second and third longitudinals 
short, running close together and curved up abruptly ; costal very 
short ; fourth forked near its apex, petiole of fork very long; eighth 
nearly straight ; sixth with an abrupt undulation. This fly is distin- 
guished at once by the shortness of the second and third longi- 
tudinals and by the curious short fork of the fourth. Length 4 to 
3 lin. A fairly common insect. 
S. albipennis, vy. Roser. 
S. halterata, M ={ 
eceeenty: S78 S. minuta, Zett. 
Black ; antennz thick, long ; proboscis and palpi black ; halteres 
white. Wings whitish ; second longitudinal short, about one-fourth 
length of wing ; third running near it, and ending at about half the 
* Walker mentions a variety with disc of thorax black. 
