PARKER: NEW ENGLAND SARCOPHAGIDAE. 39 
be absent, vestigial, inconspicuous, short, or well dexeloped. The 
anterior cross-vein varies in its relation to the end of the first longi- 
tudinal, sometimes being directly behind it, sometimes more basal 
(nearer the wing base), but the relation is not absolutely constant. 
This characterwas used by \'an derWulp (Biologia Centrali-Americana) 
in describing the Mexican species. The relative length of sections III 
and V of the costa is probably correlated with the preceding character. 
The alulae are normally fringed with short hair, but in Sarcophaga 
scoparia Pandelle, and two undescribed American species, occasional 
specimens are found which have at least the center of the margin bare. 
It is possible that species will turn up in which this character is constant. 
The color of the calypters is usually whitish or waxy white, sometimes 
smoky, and they are generally fringed outwardly with white hairs. 
In some species the tuft is of dark hair, but the remainder of the fringe 
white. This occurs in one American Sarcophaga, in which the inner 
half of the posterior margin of the upper calypter (as they lie folded) 
also bears dark hairs. I know no other species w'hich shows this last 
character. 
The characters found on the legs are among the most useful of those 
of any body region. The vestiture may be short throughout (Ravinia) 
or certain parts may bear long hair or pile. The posterior coxae are 
clothed beneath with a vestiture varying in kind and quantity, but 
except in such species as Sarcophaga scoparia Pandelle in which this is 
quite dense and long, it is too obscure and variable to be of use. The 
bristles borne on the anterior dorsal surface are also useless though 
the majority of specimens of any species will show the same number. 
A single or double row of bristles is present on the anterior coxite of 
the middle leg; the number is probably correlated with the number 
borne on the anterior coxa, either two or three. In most species the 
latter has but two rows, and when a third is present it lies between the 
others about at the center of the ventral surface. In species of Wohl- 
fartia, as far as examined, the whole ventral surface is quite evenly 
covered with long slender bristles, but they can scarcely be separated 
into rows; posteriorly they become longer and more hair-like, pro- 
jecting backward in a sort of tuft. The posterior trochanter may bear 
long or short hairs, or a 'brush.' In Sarcophaga hacmorrhoidalis 
Meigen, S. dalmatina Schiner and S. falculata Pandelle the tro- 
chanter bears a short, slender, apical spine beneath; this is not always 
easy to see in the last two species. I do not know that this character 
