1945] Notes on Hippoboscidoe 89 
complete, ending in costa. Frons nearly twice the width 
of an eye 3. 
Axillary cell (2d An) and hind fourth to half of anal cell 
(Cu+lst An) devoid of microtrichia 4. 
3. Frons very wide, at most as long as wide at postvertex. 
Frontal bristles fairly numerous, mostly in one rather ir- 
regular row. Palpi at most half as long as the height of 
the head. Wing 7 to 8 mm. long L. schoutedeni. 
Frons longer than wide at postvertex. Frontal bristles very 
few, in one row. Palpi nearly as long as the height of the 
head. Wing 9 mm. long L. majuscula . 
4. Frontal bristles few, placed mostly in one, irregular row. 
Subcosta (Sc) usually incomplete, not ending in costa 5. 
Frontal bristles numerous, in more than one row. Frons one 
and one-half times to twice the width of an eye; inner 
margins of eyes distinctly diverging to postvertex. Sub- 
costa (Sc) usually complete, ending in costa 7. 
5. Inner margins of eyes strongly diverging to postvertex; 
frons wider than an eye in both sexes, slightly narrower 
in male than in female. Smooth postvertex short and 
transverse, the anterior margin longer than the sides, 
usually without median pit. Wing 7 to 8.5 mm. long. 
L. americana. 
Inner margins of eyes subparallel or slightly diverging. 
Smooth postvertex rather long and semi-elliptical, the 
anterior margin about as long as the sides, often with a 
median pit or rudimentary ocellus 6. 
6. Frons narrow, at most as wide as an eye (even in the fe- 
male), usually narrower. Wing 6.5 to 8 mm. long. 
L. wolcotti. 
Frons wider than an eye in both sexes, usually much so. 
Wing 6.5 to 7 mm. long L. jusca . 
7. Postvertex long, semi-elliptical, the anterior angles broadly 
rounded, the anterior margin convexly curved and about 
as long as the sides. Wing 7.5 to 8.5 mm. long (New 
World and Hawaii) L. nigra. 
Postvertex short, more transverse, the anterior angles more 
abruptly rounded off, the anterior margin much longer 
than the sides. Wing 8 to 8.5 mm. long (Africa). L. dukei. 
