DIPTERA. 267 
sist of five joints, are terminated in an elongated club formed 
-by the two last, with an umbilicus at the end from which 
issues a very short seta. The posterior thighs are stout, and 
dentated or spinous on the inner side. The tarsi have but 
two pellets. The posterior cells of the wings are complete 
or closed before the margin, and narrow or elongated, oblique 
or transverse. 
These Insects compose the genus 
Mypas, 
Which is divided into two subgenera. 
CEPHALOCERA, Lat. 
Where the proboscis is in the form of a long and projecting 
siphon(1). 
Mypas, Fab. 
Or Mydas proper, where that organ, as is usual in this family, 
terminates by two large lips(2). 
In the others, the antennez are scarcely longer than the 
head, cylindrical, and tapering to a point at their extremity. 
The tarsi are furnished with three pellets. ‘The posterior 
cells of the wings are longitudinal and closed by their poste- 
rior margin. 
Curromyza, Wied. 
Where the antenne are composed of five well separated joints, the 
two last of which are the smallest(3). 
(1) A subgenus established on an Insect from the Cape. 
(2) See Fab., Lat., and particularly Dalm., Dipt. Exot., 115, who describes 
several species. This subgenus and the preceding one appear to forma particular 
division, which, in a natural order, should perhaps be placed higher. The wings 
have some affinity with those of the Pangoniz. 
(3) Wied., Dipt., Exot., I, viii. 
