243 
Micrapsis paludis. 
PIO; e077. 
Wings apparently about three and a half times longer than 
broad, uncolored except for the stigma occupying the outer half of 
the inner marginal cell and the parts above. Auxiliary vein termi- 
nating at the middle of the inner marginal cell; poststigmatal 
cross vein transverse, not very brief; trapezoidal cell brief. Pra- 
furca short and oblique, scarcely longer than the width of the first 
basal cell. Petiole of second posterior cell long, longer than the 
preefurca; fifth posterior cell slightly broader at base than at 
margin, but relatively long. Discal cell minute, quadrangular, 
about twice as long as broad, but no longer than the width of the 
fourth posterior cell. Legs not preserved. Abdomen apparently 
without markings. 
Length of fragment of wing, 9.2 mm. ; probable length of wing, 
ro mm. 
Florissant, Colorado. One specimen, No. 9039. 
EXPLANATION OF THE PLATES. 
Excepting Pl. 4, fig. 10, which is a camera lucida sketch by S. H. Scudder, all 
the drawings were made by J. Henry Blake for the U. S. Geological Survey, 
and are used here by the kind permission of the Director of the Survey. The 
line beside each figure indicates the natural size, and the enlargement is further 
specified under the explanation of each figure. The particular specimen figured 
is indicated by number. All the specimens figured are from Florissant, Colo- 
rado. 
PLATE I. 
. (1.770) Cyttaromyia princetoniana, $. 
- (13259) Cyttaromyia oligocena, §. 
- (3751) Dicranomyia inferna, 3. 
. (5582) Dicranomyia longipes, ¢. 
- (214) Dicranomyia longipes, 4. 
. (206) Oryctogma sackenii, 2. 
. (86) Cyttaromyia cancellata, }. 
. (8649) Cyttaromyia clathrata, $. 
or amt wD 
PLATE II. 
Fig. I. (173) Dicranomyia fontainei, $. 
«<2, (11817) Limnocema lutescens, §. 
“ 3. (12127) Dicranomyia fragilis, 4. 
