204 
bercles; similar tubercles also occur on the dorsal side of the seg- 
ments, being distinct only on the 10—1lth segments. The anterior 
and posterior border of 5—1lth segments are provided with spines 
and the whole 12th segment bears spines, which are situated in 
short arched rows. The anus lies on the ventral side of the last 
segment. 
The anterior spiracles are found on the posterior margin of 
the 2. segment; the atrium is conical, somewhat curved and ter- 
minates with 4 papilliform knobs. The posterior spiracles are 
surrounded with a broad chitinous frame enclosing 3 areas, which 
are filled up by the branches of the atrium; the respiratory areas 
are sinuated. 
The puparium: Length ca. 9 mm, brown, regularly ovate, 
somewhat more flattened on the ventral than on the dorsal side; 
the surface is smooth, only the hind end, which is deeply exca- 
vated in the centre, is strongly rugose; the anterior spiracles are 
not prominent and no trace of the pupa spiracles could be observed. 
The fly: Male. The head short, frons not prominent: eyes 
not touching; the narrow vertical triangle reddish brown, conti- 
nuing as a narrow stripe down into the yellowish brown. frontal 
triangle; the sides of the frons and the cheeks silverwhite; the 
frontal bristles of same length, black;. the jowls silvery in front, 
yellowish backwards and here clothed with yellow hairs. The 
bristles at the oral aperture black, the foremost long and thick, 
more than twice as long as the others. Antennæ bright reddish 
yellow, the third joint about twice as long as the second; arista 
long feathered, dark brown, yellow at the base.  Palpi yellow. 
Thorax slate grey with four dark grey stripes, the two median a 
little diverging backwards and here abbreviated, the lateral inter- 
rupted at the transverse furrow, each forming two more or less 
cuneiform spots. The humeral callus somewhat yellowish. The 
disc uniformly clothed with short black hairs. Only two acrosti- 
chal bristles just in front of the scutellum; two anterior and four 
posterior dorsocentral bristles; three humeral bristles, one post- 
