PARIvER: XKW KXCLAXD SARCOPHAGIDAE. ao 
lowrr portions of rows of frontal Kristlt-s dixcr^nii^ slightly toward 
eye orbits; lamellar of fourth M-iitral plate normally approximated 
along midxentrul line ami hearing- two parallel 'hrnslies' which are 
generally visil)le. R. comnmnift, n. sp., R. pcniruhitd, n. sp., and R. 
haematodcs (Meigen) all ha\'e the lateral processes of the penes quite 
large and extending farther forward than the median process; tiiis 
will prol)al)ly l)e foimd true of other species which agree in the external 
characters listed ahove. 
1. Ravinia communis, n. sp. 
(Most figures of external anatomy.) 
Type cf : Massachusetts Agricultural College. 
Pakatypes (cf ): Massachusetts Agricultural College, one; Boston 
Society of Natural History, two; Cornell University, tw^o; United 
States National Museum, one (no. 18,424); American Museum of 
Natural History, one; collection of C. W. Johnson, one; collection of 
writer, two. 
Breadth of front at narrowest part about one half eye width; 
lateral vertical bristles absent; anterior face of posterior femur 
typically wath five rows of bristles; submesotibial bristle strong; 
third vein bristly; four pairs postsutural dorsocentrals, all well devel- 
oped but last two pairs the longest. Lamellae of fourth ventral plate 
normally approximated along midventral line and bearing two parallel 
'brushes.' 
Length: 8 to 11 mm.; average 9 to 10 mm. 
Head. — Viewed from side parafrontals and genae with dark reflec- 
tions. Breadth of front at narrowest part two fifths to one half eye 
width; cheek height approximately two fifths that of eyes. Front 
prominent, inner orbits of eyes on its upper part converging dow nward ; 
sides of frontal vitta usually drawn in at base and converging backward 
by a curve. Tip of second antennal segment brownish; third seg- 
ment twice length of second ; arista plumose on basal half. Back of 
head somewhat convex; four rows of black cilia behind eyes; meta- 
cephalon clothed with whitish or yellowish-white hair. Genae sparsely 
covered with short erect hairs, a few^ longer ones near lower eye orbits. 
Palpi dark. 
Chactotaxy. — Lateral verticals absent; vibrissae on a line with 
mouth margin. 
Thorax. — Sutural ridge bare. Hairs covering anterior spiracle 
