14 SOUTH AMERICAN TIPULIDAE 
Two males from Lima, Peru, altitude 500 feet, August 19, 20, 
1914, collected b}^ Parish. 
Genus ORIMARGA Osten Sacken 
Orimarga andina sp. n. 
Light gray, the thoracic pleura with a broad silvery stripe; wings subhyaline; 
legs medium brown. 
Male. — Length, 8.6 mm.; wing, 5.8 mm. 
Female. — Length, 8.5 mm.; wing, 6 mm. 
Rostrum and palpi dark brownish black. Antennae very dark brown, the 
first segment dusted with gray. Head light gray, brightest on the front. 
Thoracic praescutum plumbeous with a gray bloom; an indistinct darker 
median stripe; lateral margin of the sclerite brightest; scutum light gray, each 
lobe with a darker mark, these markings almost contiguous on the middle line, 
scutellum pale brown; postnotum with a pale gray bloom. Pleura light silvery 
gray with an indistinct narrow brown line from the cervical sclerites to the 
base of the halteres; sternites darker, brownish, the sternum and the pleura 
together enclosing a broad silvery stripe. Halteres with the extreme base 
orange brown, stem white, knob brown. Legs with the coxae and trochanters 
orange-brown with a very sparse gray bloom; remainder of the legs brown. 
Wings with the extreme base orange-brown; remainder subhyaline; veins 
brown. Venation: (see plate I, fig. 7) basal deflection of Cui about mid-length 
of the radial sector. 
Abdomen dark In-own with a sparse gray l)loom, the hypopygium reddish. 
Habitat. — Colombia. Holotype, d^, La Cumbre, Colombia, 
altitude 6600 feet. May 15, 1914 (Parish coll.). Allotype, 9, 
topotypic. 
The described American species of this genus may be separated 
by the following key: 
1. Wings subhyahne with dots on the cross- veins and deflections of veins 
[color of the body blue-gray; legs pale, almost white]. (British Guiana) 
punctipennis Alexander ^^ 
Wings subhyaline or suffused with darker, not spotted with brown .... 2 
2. Tips of the tarsi white. (Panama) niveitarsis Alexander '^ 
Tips of the tarsi not white. 
3. Thoracic pleura without a silvery band; legs pale yellow with the tip of 
the femur, base and tip of the tibia black. (Southwestern United 
States) arizonensis Coquillett ^^ 
Thoracic pleura with a broad silvery band ; legs with the segments uniform 
in color throughout 4 
" 1914. punctipennis Alexander, Trans. Am. Ent. Soc, xl, p. 239, pi. IV, 
fig. 3. 
1* 1915. niveitarsis Alexander, Pi'oc. U. S. Nat. Mus., xlix, p. 7G5, pi. 75, 
fig. 5. 
19 1902. arizonensis Coquillett, Proc. U. S. Nat. Mus., xxv, pp. 83, 84. 
