132 Mittheil. d, Münchener Ent. Ver. 1881. 
p. 600) calls the aerostichal bristles. In the absence of dorsal 
rows of bristles (for instance in the Ortalidae, Tetanocera etc.) there 
is often a transverse row of four (or two) bristles, in front of the 
scutellum; they represent the terminal bristles of the (here non-existing)) 
dorsal rows. I call them praeseutellar bristles. Sometimes (in 
Trypeta), there is only a single pair of praescutellar bristles, while 
a second pair, more in front, and farther apart, represent the (ab- 
sent) outer dorsal row. The praescutellar bristl»s are always inserted 
between the scutellar bridges. A bristle, usually existing immediately 
outside of the scutellar bridge, almost in a line with the praescutellar 
bristles, belongs to the dorso-alar region and has been already men- 
tioned above as the hindmost bristle of the supra-alar group. In the 
Asilidae there are often two Zongitudinal short rows of small bristles 
in front of the scutellum; they may be called praescutellar rows. 
C. Thoracic pleural bristles. 
Prothoraeie bristle (Loew, Monogr. N. Am. Dipt. III, p. 33), 
a strong bristle, immediately above the fore coxae, which exists 
in Loew’s division Ortalina. The bristle called: Borste über 
der Vorderhüfte im Loew’s paper on Helomyzidae, p.-16, is 
homologous to this. It also exists in Cordylura, but not in 
Scatophaga; in the Calyptrata, several bristles are generally 
found here, 
Mesopleural bristles, inserted on the mesopleura, in the 
angle, formed by the horizontal dorso-pleural suture and the 
vertical mesopleural suture. There are often (for instance in 
the section Ortalina), several bristles here, arranged in a row, 
along the vertical mesopleural suture; there are two such 
bristles in Scatophaga, none in Dryomyza, nor in Helomyza. 
In the diptera Calyptrata, these bristles form a conspicuous row. 
Sternopleural bristles, one or several, on the sternopleura, 
below the longitudinal, sternopleural suture. In Loew’s divi- 
sions Ortalina and Cephalina, there is one such bristle, above 
the middle coxae. Loew calls it „Mesothoracic bristle‘“, which 
name I could not preserve however as too indefinite. There 
is one such bristle in Scatophaga, one or two in Helomyza 
and Blepharoptera, two in Sapromyza, three in Dryomyza; 
