Dec, 1904.] Tabanidae. 227 



Pangoxia 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 ma}-- be 

 separated as follows: 



1. First posterior cell closed 2 

 First posterior cell open 3 



2. Legs uniformly dark brown saiissiirei 

 Legs yellow incisa 



3. Eyes hairy 4 

 Eyes naked 5 



•i Antennae black; body uniformly blackish gray hera 



Antennse yellow with apex black; body banded with black and 

 yellow dives 



5. Whole body including the antennae pale yellowish ruficornis 

 Body largely black 6 



6. Whole antenn;e black, second abdominal segment yellow on the 



sides fcra 



Third segment of antennae yellow, second abdominal segment 

 not yellow on the sides vclutina 



Pangonia dives Williston. 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 h valine 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 IS millimeters. 



Pangonia hera Osten Sacken. I have only seen the type of 

 this species. Osten Sacken characterizes it as follows: "Pro- 

 boscis short, hardly projecting beyond the palpi ; body uniformly 



