12 Annals Entomological Society of America  [Vol. XIV, 
of the somite sub-membranous.  Pteurites subangulate, obtusely 
pointed; inner apical appendages small and inconspicuous, the evoluted 
portion scarcely perceptible; lower apical appendages (Pl. I, Fig. 10), 
broad and flat, the inner apical angle prolonged and beset with short, 
yellow hairs. 
Holotype—o. Silver City, New Mexico, May 26, 1913. 
In general appearance, this species closely resembles mpudica 
but the hypopygeal structure, especially the lower apical 
appendages, is very different. The peculiar appendage of 
the eighth sternite must not be confounded with the median 
process as found in pellucida and pyramis, where it arises from 
the edge of the somite and is not membranous. 
Tipula dimidiata spec. n. 
Small size. Cell C. concolorous; antestigmal spot very faint. 
Tergite of hypopygium broadly channeled and deeply incised in the 
middle, the lower apical appendage turned upward apically, fuscous, 
broadly rounded at the apex. 
Male.—Length 10 mm.; wing 11 mm. 
Head yellowish-gray. Rostrum dusky-yellow; frontal prolongation 
with very few hairs; nasus scarcely evident. Palpi light fuscous, darker 
outwardly. Face whitish; the fronto-occipital line distinct, expanded 
into a spot on the frontal tubercle. 
Thorax yellowish-gray. Pronotal scutum with a white line each 
side which is continued along the anterior margin, outer part of somite 
light fuscous; pronotal scutel whitish above, lateral part fuscous. 
Prescutal lines dark brown, distinct, the inner pair not sharply defined, . 
nearly straight and a trifle wider anteriorly, the median space mouse- 
gray. Markings of scutum very indistinct. Scutel and postnotum 
dark gray with faint median line. Pleura and pleuro-dorsal membrane 
yellowish-gray with a faint, whitish pollinosity. Legs slender, yellow- 
ish, pubescence very fine; femora and tibia infuscate at the apex, the 
tibiz much longer than the metatarsi; outer tarsal joints fuscous. 
Wings grayish, a trifle darker in apical portion; cell C. concolorous, cell 
S. ec. light fuscous; stigma light fuscous, the ante-stigmal spot very 
indistinct, extending as a narrow, pale streak through cell 1st M? into 
cell Mi; past stigmal spot obsolete; cell lst M? scarcely twice as long 
as wide, pentagonal; stem of cell M! one-fourth the length of the cell. 
Veins brown, Cu not seamed with fuscous. 
Abdomen yellow, dorsal stripe ill-defined, more distinct on tergite 
five; lateral fuscous stripe well marked, lateral margin of tergum not 
paler; venter paler. Eight sternite light brown, apical margin truncate 
with a narrow brush of yellowish-gray setze. Hypopygium light brown. 
Ninth tergite (Pl. I, Fig. 8), broadly channeled and deeply incised, 
canthi prominent, acute, lobes with deep, rounded emargination; the 
lateral margin ends in an acute spine; subtergal process narrowly- 
