PARKER: NEW ENGLAND SARCOPHAGIDAE. 51 
fully inutureil, uiul ure ot'teii unrecognizaMc witlinut dnsc uttcntion 
to all characters. 
It would l)e well when identifying by nieuns of gcnitidia to use all 
available illustrations in cases of doubt, as the differences in the rela- 
tion of the parts thus seen are often helpful. Besides Bottcher's work 
previously referred to, the figures presented in Kramer's article, 
" Die Tachiniden der Oberlausitz," will be found useful.^ 
Table of Genera. 
Male specimens of New England genera, the species of whicli possess 
any of the following characters do not l)elong to Ravinia, Boettcheria, 
or Sarcophaga: arista downy; third antennal segment not longer 
than second; cheek vestiture bristly; vestiture of l)ack of head 
entirely black; orbital bristles present; less than four notopleurals 
and these equally strong (possible exceptions) ; several pairs of post- 
sutural acrostichals present but only last pair conspicuous; anterior 
coxa with naore than three rows of bristles; ventral surface of abdomi- 
nal nota bristly; abdomen dull, that is, without spots or bands of color 
that change with each change of light; first genital segment hump- 
backed and with two rows of bristles; accessory plates prolonged, 
appearing as if a division of forceps, the latter apparently with four 
prongs. Males are also eliminated when females have a linear ovi- 
positor or an apparent fifth abdominal segment. 
1. Bristles of the intermediate row or rows on anterior face of posterior femur 
longer and stouter (at least as long and stout) than those of upper and 
lower rows; sides of ventral plates, as a whole, diverge posteriorly. 
Boettcheria. 
Bristles of the intermediate row or rows on anterior face of posterior coxa 
always much shorter than those of upper and lower rows, sometimes 
absent ; sides of ventral plates as a whole, parallel or converging posteri- 
orly (second may appear broadest in some species of Ravinia) 2. 
2. Frontal bristles parallel or lower portion of rows sUghtly diverging toward 
eye orbits, anterior acrostichals present, epaulets brown and light yellow 
or only yellowish, lower sternopleura with several rows of bristles. 
Raiinia. 
Lower portions of rows of frontal bristles diverging more or less broadly 
toward eye orbits; epaulets dark; or if one or both of these characters 
are as in Ravinia, the anterior acrostichal bristles are absent and the 
lower sternopleura has but one row of bristles.- Sarcophaga. 
>■ Kramer, H. Abliandl. d. Xaturf. Ges. zu Gorlitz, 1911, p. 117-166, pi. 1-3. 
2 These characters are sufficient for separating at least all New England species of 
these two genera. 
