183 
G. F. Ferris and F. R. Cole 
of these areas appear to afford specific characters. In L. depressa the frontal 
vitta is rather short and broad and the ocellar area correspondingly larger. 
The ventral side of the head bears a few small setae. 
Thorax with a row of large but slender pre-alar setae; with an irregular series 
of smaller setae across the mesonotum; with a group of three post-alars and 
a group of three or four pre-scutellars on each side; with a median pair of 
scutellars. On the ventral side both meso- and meta-sterna are thickly beset 
Fig. 1. Lipoptena depressa (Say), female. 
with short, stout setae. The legs present no special characters except that 
the anterior tibiae are without an apical seta on the inner margin and that the 
claws are equal (Fig. 2 D). 
Wings (Fig. 2 B) weakly veined as is characteristic of the genus, vein /? 4+5 
(the third vein of Dipterists) with a stigma-like expansion ac the margin. 
Abdomen with a conspicuous pair of diverging lines on the dorsum, these 
lines forming an inverted V and attaining the lateral margins slightly behind 
