JAMES S. HINE 
295 
Tabanus alteripeimis Walker 
18()0. Tabanus alleri'pennis Walker, Trans. Ent. Soe. London, v, 274. 
There are three descriptions of Tabaiiids that seem to be rather 
close so far as coloration and wing markings are concerned. 
Walker described alteriyennis from Mexico, Osten Sacken de- 
scribed erebus from Costa Rica and Bellardi described caliginosus 
from Mexico. The length of the first one is given as four and 
one-half lines, that of the second as thirteen to fourteen milli- 
meters, and that of the third as twelve millimeters. Four speci- 
mens from Juan Vinas measure from seven to nme millimeters 
and are of the proper length therefore for alteripennis. Osten 
Sacken suggested the close relationship of alteripennis to his 
species, and Williston holds the opinion that erebus is the same as 
caliginosus. The striking difference in size indicated leads one 
to defer the question of synonymy until more material is available. 
The wing is brown with a large hyaline spot including the apical 
half of both basal cells and parts of other cells in that region, 
another hyaline spot includes the apex of the discal cell and the 
bases of second and third posterior cells, and a thii’d hyaline spot 
just before the furcation of the third vein. The body is nearly 
uniform brown with the apex of the abdomen dark, nearly black. 
The front is exceptionally narrow and the antenna is yellow with 
the annulate portion of the third segment black. 
Tabanus venenatus Osten Sacken 
1886. Tabanus venenatus Osten Sacken, Biol. Cent. -Am., Dipt., i, 54. 
One specimen, Peralta Station, 1088 ft. alt., March 10, 1910. 
The third segment of the antenna is very deeply excised forming 
two branches. General color brown; wing pale brownish, more 
intense in the region of the stigma and continumg backward as 
a wide band, but fading out before the hmd border is reached. 
Osten Sacken’s specimens are from Guatemala and Panama. 
Tabanus fenestra Williston 
1887. Tabanus fenestra Williston, Trans. Kans. Acad. Sci., x, 141. 
Two specimens marked Costa Rica. The type is from San 
Domingo, and there is before me a specimen from Sanchez, San 
Domingo. The uniform dark color of the body is distinctive. 
Thorax dark brown, femora dark, tibiae, tarsi and antennae 
yellow; wings smoky, darkest anteriorly. Abdomen black with 
white bloom. 
TRANS. AM. ENT. SOC., XLIII. 
