THE CRANE-FLIES 1011 
concerning this. The alternative explanation would call the free tip of Sc, as 
above, a supernumerary crossvein, with the remainder of the venation about as 
interpreted. The three genera of the Orimargaria now known may be separated 
as follows: 
1. A supernumerary crossvein in cell R, between the origin of Rs and R2; anal region of wing 
greatly expanded, the veins long. 
Protorimarga, gen. n. 
No supernumerary crossvein in cell R,; anal region of wing narrowed, the veins, espe- 
celal Ga A, comespondinaly: Taduceds wed css few vas seo te dete an vane baer bees 2. 
2. Cell MW; of wing present; m-cu underneath Rs. 
Orimarga Osten Sacken. 
Cell M; of wing lacking; m-cu some distance before origin of Rs. 
Diotrepha Osten Sacken. 
Protorimarga, as known, is solely Ethiopian. Orimarga has been found in 
all the major regions of the world. Dviotrepha is Neotropical, invading the south- 
ern portions of the Nearctic Region. 
Protorimarga bequaertiana, new species 
Text Figs. Nos. 10, 3 and 12, and 11, 7 
General coloration dark brown, the head and mesonotum more pruinose; first antennal seg- 
ment brownish black, the remainder obscure yellow; knobs of halteres dark brown; femora chiefly 
dark brown, with a narrow subterminal white ring; wings whitish, with a heavy, chiefly costal 
dark brown pattern. 
Male. — Length about 6.5 mm.; wing 3.6 mm. 
Described from an alcoholic specimen. 
Rostrum and palpi brownish black. Antennae with the basal segment brownish black, the 
remainder of the organ obscure yellow, the outer segments somewhat darker; outer flagellar seg- 
ments more elongated; verticils of segments relatively inconspicuous. Head dark gray; anterior 
vertex relatively narrow, about one-half wider than the diameter of the first scapal segment. 
Pronotum brown. Mesonotum chiefly bluish gray, the humeral region of the praescutum more 
obscure yellow, the lateral margins behind the pseudosutural foveae darker brown. Pleura chiefly 
dark brown, the dorso-pleural region paler; a very narrow pale longitudinal vitta crosses the 
sternopleurite, the sclerite ventrad of this darker brown. Halteres white, the knobs dark brown. 
Legs with the fore coxae and trochanters pale brown, the remaining coxae and trochanters brownish 
black; femora obscure yellow basally, passing into dark brown, before the tips with a narrow 
white ring, the dark tips approximately three times as wide as the subterminal annulus; tibiae 
dusky, the extreme base narrowly white, the tips more broadly blackened; tarsi chiefly brownish 
white. Wings (Fig. 10, 3) whitish, with a distinct, chiefly costal, dark brown pattern, including about 
ten areas, the largest surrounding the free tip of Sco, confluent with a narrower seam along the 
cord; the other spots surround / and the arculus; origin of Rs and its spur; tip of Sc; the super- 
numerary crossvein in cell Ri; Ri +2; perpendicular base of R2; perpendicular tip of R3; m-cu and 
a small spot at the fork of M3. 4; veins whitish, very indistinct, darker in the infuscated areas. 
Wings considerably dilated in the costal region, opposite the cord, this possibly a character of the 
male sex; anal region considerably dilated, especially the outer end of cell {st A; cell 2nd A 
elongate, the outer end pointed. Venation as discussed under the generic diagnosis. 
Abdomen chiefly dark brown, the lateral margins of the sclerites narrowly pale; hypopygium 
brownish black. Male hypopygium (Fig. 10, 12) with the basistyles relatively elongate, the mesal 
face unarmed except for somewhat more numerous setae. Other characters of the hypopygium 
as defined under the genus. 
Hab. LiBERIA. 
Holotype, alcoholic 2, Firestone Plantation No. 3, on right bank of Du River, 
ten miles east of Monrovia, July 26, 1926 (J. Bequaert). 
