1938] 
Fossil Insects 
117 
Female. Specimen Nos. 3950 and 3951 is without head, 
obverse and reverse. These wings are a little better pre- 
served and show the third longitudinal vein and costa ending 
quite beyond the tip of wing, though not nearly as much as 
in Rhingia. The abdominal pattern is quite similar ; beyond 
the fact that the segments are slightly wider, I am unable 
to detect differences of importance. One whole hind leg 
Fig. 3. Platycheirus persistens Hull, n. sp. A, abdomen; B, tibia 
and tarsus of holotype, No. 3949, M. C. Z. 
(right) is preserved. The femora were slightly thickened 
one and two-fifths the width of tibiae and the tarsi were 
not dilated. The obverse is fragmentary and poor. Perhaps 
a trace of antennae appears upon it. The opposite hind 
tarsus is shown, the maculation is deceptive and the abdomen 
also appears disproportionately short and wide. 
Holotype: 1 male, No. 3949; in the Museum of Com- 
parative Zoology. 
Paratype: 1 female, No. 3950; in the Museum of Com- 
parative Zoology. 
