1924 ] 
The Biology of Trichopoda pennipes Fab. 
65 
bristles, one on the prothorax, the propleural bristle (pp), and 
one on the sternopleurite, which the writer has called the sub- 
stigmal bristle (ss). The sternopleurite bears typically two 
sterno-pleurals (stb), although a third was found to be present 
on some individuals. A curved row of three to five hypopleurals 
(hp) is located on the meropleurite. A single pteropleural 
bristle (ptb) was present in some specimens examined, while 
others bore as many as four. 
Appendages of the Thorax. 
Legs. PI. I, fig. 4; PL II, figs. 7 and 8. The coxa (cx) is tawny 
in color, with a grayish bloom, while the trochanter (tr) and the 
proximal portion of the femur (fe) are yellowish. The distal por- 
tion of the femur and the tibia (tb) and tarsus (ta) are black. The 
claws are yellowish tipped with black, and are fringed with very 
fine light-colored hairs. There is a bristle-like empodium (ep) 
which, since it is a prolongation of a ventral plate, is a true em- 
podium according to Crampton (1923). The pulvilli (pv) are 
buff-colored, and in the male are quite large and conspicuous. 
The first two pairs of legs display no features of particular 
interest. The tibise of the hind legs, however, exhibit on the 
outer side a peculiar row of black, feather-like setae, which stand 
nearly erect, and the longest of which are at least one third the 
length of the tibia itself. This row is in reality double, since a 
row of smaller scales is appressed to the larger ones on the 
outside. The hind tibia also bears on its inner face a single 
bristle of a size noticeably larger than any of the surrounding 
hairs. 
Wings. PL II, figs 5 and 6. The wings of the female are 
dusky, with the posterior margin sub-hyaline. Those of all the 
males examined bear a somewhat variable yellowish area in the 
forepart of the wing, the extent of which is indicated in figure 5. 
According to Coquillett (1897) this character is not constant. 
The figure of the wing of the female (fig. 6) explains the 
venation of the wings, while the cells are labeled in the figure of 
the wing of the male. The chief point of interest in the wing 
venation of T. pennipes is that Mg is bullate or weakened 
basally, making Mg appear as a stub sticking up from Cm. 
