eae 
DIPTERA. - 265 
dd. Third feeler-joint about four times the, length of the second ; sixth 
downy. . 
addita. 
ececec. Prebrachial vein forming a slightly obtuse angle at its 
‘flexure. 
d. Third feeler-joint about twice the length of the second. 
atriventris. ‘ 
dd. Third feeler-joint near twice the length of the second. 
umbrosa, dubia, 
ddd, Third feeler-joint six times the length of the second. 
e. Facialia beset with bristles. 
adusta. 
ee. Facialia without bristles. 
alta. 
cececec, Prebrachial vein forming an obtuse angle at its flexure. 
d. Third feeler-joint full twice the length of the second. : 
picea, umbrifefa, compacta. 
dd. Third feeler-joint thrice the length of the second. 
e. Facialia without bristles. 
interrupta, obconica. 
ee. Facialia bristly. 
chrysotelus. 
dd. Third feeler-joint four times the length of the second. 
subpicea. e 
eececece. Prebrachial vein forming a very obtuse angle at its flexure. 
d. Sixth feeler-joint bare. 
e. Third feeler-joint about twice the length of the second. 
sordida, subaurata. 
ee. Third feeler-joint not less than thrice the length of the second, 
antennata, ancilla, 
eee. Third feeler-joint not less than four times the length of the second. 
obconica, vulgata, tricincta. 
dd. Sixth feeler-joint pubescent. 
e. Third feeler-joint much more than twice the length of the second. 
vittata. 
ee. Third feeler-joint thrice the length of the second. 
tenebrifera, scita. } 
eee. Third feeler-joint four times the length of the second. 
