1965] 
Fairchild — Neotropical T abanidae 
21 1 
The position of Selasoma , similar in its coloration and incrassate 
tibiae to Lepiselaga, is dubious. It has generally been placed near 
Lepiselaga (Lutz 1913, Enderlein 1925, Krober 1934) but there 
are fundamental points of difference. The basicosta bears a fair 
number of setae, the palpi are greatly inflated but not flattened, the 
frons is narrow with a rugose linear callus nearly filling it and with- 
out tubercle or ocelli at vertex, the labella are large and wholly 
membranous, the first antennal segment is not elongate, the second 
bears a dorsal tooth and the basal plate of third is wide and flattened. 
The eyes are unpatterned in life, dull greenish black, while those of 
Lepiselaga and Himantostylus are characteristically banded. Accord- 
ing to Lutz (1913) the species is crepuscular and bites horses on the 
belly. Records from Panama confirm this. 
Stigtnatophthalmus Lutz 
1913, Mem. Inst. Osw. Cruz, 5(2): 174, 184-185, PI. 13, fig. 23. Type 
Stigmatophthalmus altivagus Lutz. 
Stigmatophthalmus altivagus Lutz was placed by Lutz (1913) 
with Selasoma and Lepiselaga, by Enderlein (1925) near Stibasoma , 
and by Krober as a subgenus of Dicladocera. It has, however, setose 
basicosta, large membranous labella, and no vestiges of ocelli. The 
wing pattern is somewhat like Selasoma , though more extensively 
black, and the fore tibiae slightly incrassate. Except for the wing 
color, there seem to be no characters that would exclude it from 
Tabanus , much less allow placement in the Diachlorini. It certainly 
does not seem in any way related to Lepiselaga or even Selasoma. 
Lutz figures the species as with green eyes with a single dark band. 
I have given a figure of head structures elsewhere (Fairchild 1961). 
Nothing is recorded of its habits, and it seems to have been taken 
only about Petropolis and in the mountains of Sta. Catarina in 
southern Brasil. 
Himantostylus Lutz 
Fig. 1 
1913, Mem. Inst. Osw. Cruz, 5 (2): 174, 183-184, PI. 13, fig. 22. Type H. 
intermedins. 
The genus and species were based on a single male from eastern 
Peru. Stone (1934) later described the female from Bolivia. A long 
series of females and a single male were secured in Darien, Panama, 
in 1963, and there are other specimens collected by Luis E. Pena at 
Quincemil, Dept. Cuzco, Peru, Oct. 1962 in the collection of Dr. 
L. L. Pechuman. Panama specimens are darker, having the cubital 
cell and anal area as dark as the basal cells, not paler as in the type 
and other Peruvian material. 
