No. 2080. NEW SPECIES OF CRANE-FLIES— ALEXANDER. 443 
Rostrum bluish black at the tip, light brown basally, palpi black. 
Antennae brownish black, the flagellar segments rounded oval. Head 
reddish chestnut, darker on the middle of the vertex. 
Thoracic dorsum dark chestnut with thi-ee black stripes, the 
median one longest, the lateral stripes very indistinct, clearer behind; 
the region near the transverse suture including the posterior part of 
the praescutum and the anterior part of the scutum light yellow; 
scutum trivittate wdth black; scutellum and postnotum chocolate 
brown, more yellowish on the sides. Pleurae reddish yeDow. Hal- 
teres brown. Legs with the coxae and trochanters reddish, femora 
dark brown, pale yellowish at the base, tibiae and tarsi black. Wings 
whitish hyaline with small brown marks at the origin of Rs, on cross- 
vein r, along the cord, on the basal deflection of Cu^ and along the 
outer end of cell 1st M^. Venation as in figure 3; basal deflection 
of Cu^ far before the fork of M about underneath the middle of Rs. 
Abdomen long, slender, black, the caudal portions of the segments 
chestnut-yellow, seventh segment mostly chestnut, the hypopygium 
black. 
Habitat. — Panama. 
Holotype. — Male, Porto Bello, Panama, March 4, 1911, Aug. 
Busck, coll. 
Paratypes. — Five males, topotypic, same date and collector. 
Type-specimen. — Cat. No. 18498, U.S.N.M. 
Genus ORIMARGA Osten Sacken. 
Orimarga Osten Sacken, Mon. Dipt. N. Amer., vol. 4, 1869, p. 120. 
ORIMARGA NIVEITARSIS, new species. 
Black with two silvery lateral stripes on the thorax, tips of the tarsi 
white, wings unspotted. 
Male. — Length, about 5.8-6 mm.; wing, 4.6 mm. 
Female. — Length, about 6.8-7 mm.; wing, 4.4 mm. 
Rostrum, palpi, and antennae black. Front narrowly silvery 
between the eyes, remainder of head grayish. 
Thoracic dorsum black, shiny; the lateral margin of the praescutum 
up to the wing-root narrowly silvery. Pleurae black with a con- 
spicuous silvery mark, narrowest in front, broader behind. Halteres 
hght brown, knob darker. Legs with the coxae and trochanters dull 
yellow, femora dark brown fighter on the basal half, tibiae dark brown, 
tarsi, segment 1 \\ath the basal two-thirds dark brown, remainder 
of the tarsi white except the terminal segment and claw which are 
darker. Wings hyaline, veins dark brown, distinct. Venation as 
in figure 5. 
Abdomen dark brownish black. 
Habitat. — Panama. 
