347 
CHAMAEMYIA Panzer 
This genus has usually been considered as a synonym of Och- 
thiphila but it is readily separated by means of the characters cited in 
the above key to genera. : 
The only species, elegans Panzer, occurs in Europe and has been 
recorded from New Jersey. There are two specimens in our collection 
from Illinois: Champaign, July 25, 1889, and Mayview, July 31, 1891 
(Terrill). 
Larval habits unknown. 
OcHTHIPHILA Fallen 
There is but one species of this genus in our collection from Illinois, 
polystigma Meigen. It is generally distributed throughout the state, - 
and is apparently as common in this country as in Europe. 
I know nothing of the larval habits. 
PsEuDopDINIA Coquillett 
KEY TO SPECIES 
1. Frons anterior to ocelli, distinctly longer than wide (Pl. XLVI, Fig. 7, 11); 
EIPIAG RANG HAST VOLO WW: fefesebisio\e olesetore {ajev1e/e:sie\ ce ena: elei sia’ (ease, 000 polita Malloch 
—  Frons anterior to ocelli at least as wide as long; apices of tibiae and the 
EUSA APY CLIO Wy shate-ctereye acean’ oi oPetejaPevaratetelot ors. cla ereye ecw aldiule cafe) cleyeale-cly, sie aseyele aieayelede 2 
2. Frons anterior to ocelli much wider than long; apices of third and fourth 
GUI Nee CLV OP CLL. utalsy chaps etescts tacate halsie dusvere.sleteisreput arecstely eats varipes Coquillett 
— Frons anterior to ocelli as wide as long; apices of veins 3 and 4 not di- 
SOMES CHL Ut ote rates’ < Pape taloretane ehel Stern Nyer steele. ates eisls, a/olere'e" «/evetevetsieie.o,sta¥a'a/s eveis teva ele tere: 6 3 
3. Thorax and abdomen polished, almost without pruinescence; last section 
of fourth vein more than twice as long as preceding section............ 
ait EOE Apt TE RE VEAP Oo IO CUMRA Re PRICE COPTER aI a nitida Melander 
— Thorax and abdomen shining, with distinct pruinescence; last section of 
fourth vein twice as long as preceding section...... pruinosa Melander 
PsEUDODINIA NITIDA Melander 
Three specimens with data as follows, from Illinois: Urbana, Au- 
gust 30, 1914, and September 3, 1916; and White Heath, July 11, 1915. 
Taken by the writer. 
Larval habits unknown. 
PSEUDODINIA POLITA Malloch 
A common species in some parts of Illinois. Our specimens are 
from Centerville, August 16, 1914, 5 specimens; White Heath, May 30, 
