I'AKKKH: NEW K.NCl.AM) SAUCOIMIACIIDAE. 13 
way to the jintcrior cross vein. The hitter is directly Ix'hiiul the point 
where the first l(>n<ritiuniial joins the costa. On the lower surface a few 
hairs are l)orne at the junction of t lie sccoi id and tiiird \cins. 
Lcg.s. 
The le^s (PI. 2, fifrs. 12, 14; PI. 4, fijr. 29) consist of the usual five 
parts: coxa, trochanter, femur, tihia, and tarsus. In order that the 
surfaces or faces of these segments may I)c clearly designated, the legs 
are considered to he extentled straight laterally at right angles to the 
longitudinal axis of the body. The coxae, femora, and tibiae have 
four faces each: that which is directed toward the front is the anterior; 
that toward the rear the posterior; that downward the ventral; and 
that upward the dorsal. Only the ventral surface of the trochanter 
will be referred to. The tarsi are somewhat flattened dorso-ventrally 
showing distinct dorsal and ventral faces, but only posterior and 
anterior edges (except the first segment which is more cylindrical). 
Coxae. — With the exception of the middle coxae, these are united to 
their corresponding thoracic segments entirely by meml)rane. The 
posterior coxa is divided into two parts: dorsally it bears a small 
rounded projection which slides along a groove in the lower edge of the 
meta-episternum. Vcntrally it bears on its distal portion a prominent 
tuft of close set, slender bristles. Seen from above the middle coxa 
shows division into three parts, the coxites (PI. 3, fig. IS). The 
anterior coxite has united with the sternopleurite, and the upper one 
with the meropleurite. The third or distal coxite is the largest. 
From its dorsal anterior margin, a chitinous hook extends forward and 
downward. It probably acts as a buffer to prevent the femur from 
rubbing against the side of the thorax. Lowne figures it on the middle 
coxa of the blow -fly, but does not mention it in the text (PI. 3, fig. 18; 
PI. 2, fig. 12, mcx.). I shall call it the mesocoxal spur. It has been 
noted among syrphids, anthomyiids, tachinids, muscids, dexiids, and 
sarcophagids; but apparently is not common to all Diptera. The 
anterior coxa consists of a single piece. At its proximal, dorsal ex- 
tremity it is slightly hollowed out for articulation with the pro- 
episternum. The trochantins of the anterior and posterior coxae are 
visible, but not that of the middle coxa. 
Trochanters. — The posterior trochanter bears a group of thickly set, 
rather stubby, short spines on its ventral surface. This is termed 
