Dec., 1904.] 
Tabanidae. 
227 
Pangoxi.\ Latreille. 
Following previous American authors I have not used all the 
generic names used by some European authors, but have consid- 
ered the species as all belonging to Pangonia. By some our two 
speiecs with the eyes naked and the first posterior cell closed 
would be considered under Pangonia ; those with the eyes naked 
and the first posterior cell open under Corizoneura; while those 
with the eyes pilose and the first posterior cell open would come 
under Diatomineura. Our species of this group do not seem to 
appear in numbers like various species of Tabanus, consequently 
good series are not often met with in collections. There are 
seven western species considered in this paper and these may be 
separated as follows; 
1 . 
2 . 
3. 
4 
o. 
G. 
First posterior cell closed 
First posterior cell open 
Legs uniformh' dark brown 
Legs yellow 
Eves hairv 
2 
3 
saiissurei 
incisa 
4 
Eyes naked ' 5 
Antennae black; body uniformly blackish gray hera 
Antennae yellow with apex black; body banded with black and 
yellow dives 
Whole body including the antennae pale yellowish ruficornis 
Body largely black 6 
Whole antennae black, second abdominal segment yellow on the 
sides fera 
Third segment of antennae yellow, second abdominal segment 
not yellow on the sides velutina 
Pangonia dives \Yilliston. The eyes are pilose, the antennae 
are yellow with black at the apex of the third segment ; legs red- 
dish with apexes of tibiae and tarsal segments more or less fuscous 
wings hyaline with costal border dilute yellowish, anterior branch 
of the third vein with a stump at the base; abdomen with the 
anterior part of each segment black, posterior part yellow. The 
yellow often predominates on the first three segments while I 
have not observed any variation of the remaining segments. 
Length about 15 millimeters. 
It appears that Diatomineura californica Bigot is a synonym. 
Pangonia fera Williston. The antennae and legs in both sexes 
are black, and the abdomen is black with red on the sides of the 
second and often the third segments, and in the female especially 
the posterior border of each segment is fringed with yellow hairs ; 
the eyes are naked and the wings are nearly hyaline with brown 
veins and stigma and dilute yellowish costal margin ; ocelli pres- 
ent, thorax black with black pile. Length 12 to 18 millimeters. 
Pangonia hera Osten Sacken. I have only seen the tvpe of 
this species. Osten Sacken characterizes it as follows; “Pro- 
boscis short, hardly projecting beyond the palpi ; body uniformly 
