894 CHARLES PauL ALEXANDER 
found on all the continents and on many of the oceanic islands. The 
species are rather small, are dull-colored, and are often difficult of exact 
determination. 
The immature stages are spent in a wide range of habitats, described 
on page 838 
The local species of the genus Dicranomyia may be separated according 
to the following key: 
itt 
iw) 
ao oOo —_- ww 
10. 
11. 
13. 
Wings with but one free branch of the media reaching the margin. [23d Rept. N. Y. 
State Ent., p. 211-212, pl. 27, fig. 5. 1908.) (Plate XXXI, 15.)..D. whartoni Needm. 
Wings with two free branches of the media reaching the margin..................... 2 
. Wings narrow, lanceolate; cell 1st M2 open; thoracic pleura with a brown longitudinal 
stripe. [Limnobia longipennis Schum. Beitr. zur Ent., vol. 1, p. 104, pl. 1, fig. 2. 
AS ZO ST fier Gabe yEXEX Oe es TA) os a ee ac cA Gy ae eee ea D. longipennis (Schum. ) 
Wings broads: = feces eh pa ee Le i Ng 3 
. Se ending opposite, or before or slightly beyond the origin of the sector............... 4 
Sc ending far beyond the origin of the sector.................. eR Nn Gb oa Oot 20 
~ Antennae with atleast the basal segments pale: . 12.25.5225 eee 5 
Antennae with the segments dark thruout. = 2.25 2.4.) nea ee eee 9 
3) Celleiist: M2 open! (cross-veinm lackine))\ = 2). is eee eee eee 6 
Cell. fst? Mo closed)... e208 HO ie Bal te OL alae oe ee eee a 
. Prescutum with a single brown stripe; dorsal pleural appendage of the male hypopygium 
a short hook. [Proc. Acad. Nat. Sci. Phila., p. 211. 1859.]...... D. immodesta O. 8S. 
Prescutum with three brown stripes; dorsal pleural appendage of the male hypopygium 
a long, saber-like hook, which is contiguous with its mate on the opposite side. [Proc. 
Mcad= Nats ociiehilas ips 2) 2emp le oehios heal SHO i nee ene ee D. gladiator O. 8. 
. Pale yellowish thruout, only the tips of the tarsi and the eyes darker; in life the abdominal 
segments somewhat greenish. [Proc. Acad. Nat. Sci. Phila., p. 212. 1859.] (Plate 
SXOXEXET DD is eu Fo canes ile Cre Cu ks sale yo rt Sea i nee pe D. pudica O.S. 
Brownish yellow, the antennae darkened at the tips; halteres brownish............... 8 
. Halteres pale, the knobs infuscated; abdomen brownish yellow. [Journ. N. Y. Ent. Soc., 
VOVES ip el So apleMant On Ose OOO Eee ones ce reat nek Ss eee eae D. isabellina Doane 
Halteres and abdomen brown. [Proc. Acad. Nat. Sci. Phila., p. 212. 1859.] 
D. diversa O. 8. 
. Cell 1st M2 open; Sc far before the origin of Rs, due to the shortness of the latter which 
is about equal to the basal deflection of Aut-s.:.5..........5.2-. soe eee eee 10 
Cell ist Mz closed; Sc nearly opposite the origin of Rs, which is much longer than the 
basal deflection of Retse. <5 ser tees ee eee 11 
Rostrum elongated, nearly as long as the head, brown; prescutum with a single dark 
brown stripe. [Mon. Dipt. N. Amer., part 4, p. 65. 1869.] (Plate XX XI, 16.) 
D. rostrifera O. 8. 
Rostrum much shorter than the head, light yellow; prescutum with three dark brown 
stripes. [Mon. Dipt. N. Amer., part 4, p. 66. 1869.].............D. brevivena O.S. 
Thorax shining black, the pleura with a grayish pruinosity. [Proc. Acad. Nat. Sci. 
Phila: ps lien 860s] se (hla te eXOXexal 235) 2 Use ee eee D. morioides O. 8. 
Thorax not shining black; gray, brown, or yellowish brown.....................--- 12 
. Femora brown with the tips broadly yellow; wings marked with brown. [Limnobia badia 
Walker. List Dipt. Brit. Mus., vol. 1, p. 46. 1848.] (Plate XX XT, 20.) 
D. badia (Walk.) 
Femora not banded with yellow; wings unmarked or nearly so....................- 13 
Sc: much longer than Sc2, being nearly if not quite the length of the stigma......... 14 
Sc: short, not more than one-half the length of the stigma........................-. 16 
