1953] 
Fah'chilcl — Mexican Tabaniclae 
49 
two segments sparsely pale pollinose and black haired, the 
third rather slender with a weak to moderate dorsal angle. 
Palpi moderately inflated, slender tipped, yellowish, white 
pollinose, mostly black haired but with more or less 
white hair basally. Proboscis short, hardly exceeding palpi, 
brown, the labella fleshy. 
Fig. 2. Stenotahanus litotes n. sp. Holotype. Antenna, frons and 
palpus X 22. 
Mesonotum light brown, thinly greyish brown pollinose 
and with two slender, rather faint, yellowish pollinose 
stripes. Both mesonotum and the concolorous scutellum 
clothed with pale hairs. Pleura and sternum pale grey, 
sparsely pale haired. Wings with subepaulet bare, costa, 
subcosta and first vein setose above, and a short to moder- 
ate appendix on upper branch of third vein. Wings faintly 
yellowish smoky, but without distinct clouds or streaks; 
costal cell not darker, stigma yellow. Legs dull yellowish 
brown, the tarsi darker and fore tibiae obscurely bicolored 
through having pale hairs on basal half, black hairs distally. 
Abdomen brown, mainly brown pollinose, but the hind 
and lateral margins of all tergites pale yellowish pollinose. 
There are also indistinct pale pollinose narrow median tri- 
angles, in most specimens forming a faint to clear median 
stripe, in a few interrupted on the anterior part of each 
tergite. In most specimens there are no indications of dor- 
