1944] Studies on Syrphid Flies 31 
Abdomen: elongate, slender, but considerably flattened, the sides 
posteriorly curved over narrowly along their edges. First seg- 
ment short, yellow, broadly brownish across the middle; second 
segment barely longer than the third; third and fourth equal; 
fifth segment square; the second segment is almost twice as long 
as wide; the fourth segment just about a half again as long as 
wide. Second segment brown with a pair of large, oblong, 
brownish-orange spots well separated from the middle, anterior 
and posterior ends rounded, reaching the margin and on one side 
reaching the posterior corner. Third segment brownish-orange 
except as follows, a prominent median stripe the full length ex- 
panded suddenly near the apex into a marginal fascia; this fascia 
narrowly connects towards the side with a posterior-lateral, acute 
triangle of brown, produced as far forward as a distance equal 
two-fifths the length of the segment; the outer margin of this 
acute triangle is oblique. The fourth segment has a very similar 
pattern except that posteriorly the middle stripe reaches the apex 
of the segment; its lateral expansion is more or less obsolescent 
and the posterio-lateral acute brown triangles are well developed, 
no wider than these of the third segment but reach forward just 
past the middle of the segment. Fifth segment quite similar to 
the fourth in every respect except that it is smaller and that the 
posterio-lateral triangles are merely elongated vittae reaching the 
same proportion of the segment. Legs: the legs seem to be wholly 
light yellow, basal half of the hind tibiae barely darker because 
the pile appears to be darker. The pile is chiefly pale golden but 
on the hind femora and basal half of its tibiae it is largely but not 
entirely brown. Wings: pale brownish; diffusely darker brown 
throughout the subcostal marginal cell and the apex of the sub- 
marginal cell; subapical cross vein rather sinuous, joining the 
third vein at right angles. 
Holotype: No. 23784, one female. Soledad, Cuba, Feb. 27th, 
1926, George Salt. 
Baccha ochreolinea n. sp. 
Related to cultrata Austen; it is characterized by the broad 
abdomen and interrupted yellow fascia of the third abdominal 
segment, etc. 
Female. Length about 8 mm.; wing 7.5 mm. Head: hemi- 
spherical, deeply excavated in the middle; vertex narrow, dark, 
obscurely shining brown, continued forward as a wedge of slightly 
