58 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
2. Ravinia peniculata, n. sp. 
PL 7, fig. 45. 
Type cf : Massachusetts Agricultural College. 
Paratypes (cf ): Boston Society of Natural History, five; Cornell 
University, one; collection of author, one. 
Breadth of front at narrowest part about one half eye width; lateral 
vertical bristles absent; anterior face of posterior femur typically with 
three rows of bristles, the lower may appear double; submesotibial 
bristle absent; three pairs postsutural dorsocentrals, all long. Lamel- 
lae of fourth ventral plate normally approximated along mid-ventral 
line and bearing two parallel 'brushes.' 
Length: 7 to 8.5 mm. 
Head. — Viewed from side parafrontals and genae with dark reflec- 
tions. Breadth of front at narrowest part about one half eye width; 
cheeks, height approximately one third that of eyes. Front promi- 
nent; inner orbits of eyes on the upper part converging downward; 
sides of frontal vitta very slightly drawn in at base, practically parallel, 
though sometimes converging backward in a weak curve. Second 
antennal segment blackish ; third about twice length of second ; arista 
plumose on basal half. Back of head somewhat convex; at least five 
or six rows of black cilia behind eyes extending down nearly to fora- 
men ; metacephalon clothed with whitish-yellow hair. Genae sparsely 
covered with short, erect hairs, a few longer ones near lower eye orbit. 
Palpi dark. 
Chaetotaxy. — Lateral verticals absent; vibrissae on a line with oral 
margin. 
Thorax. — Sutural ridge bare. Hairs covering anterior spiracle 
light colored, mostly grayish; those on anterior margin of posterior 
spiracle dark brown, outwardly faintly tinged with yellow; spiracular 
cover pale yellow. 
Wings. — Bend of fourth vein normally a right angle, sometimes a 
little more or less; anterior cross-vein behind end of first longitudi- 
nal; third vein bristly; section V of costa about one and one half 
times section HI; alulae fringed with hair; calypters whitish, out- 
wardly fringed with white hair. 
Legs. — Dark; posterior trochanter without ' brush ' ; femur spin- 
dle- or subspindle-shaped, anterior face typically with three rows of 
bristles, those of second row quite short, those of third usually so 
arranged that row appears double; tibia nearly straight; tarsus equal 
