THE CRANE-FLIES oF New York — Part II 943 
on the swarming habits of this species have been published (Alexander, 
1912 a:72-73): 
On June 13, 1909, I found the snecies swarming [on Sport Island, in the Sacandaga River, 
New York] and made the following observations: The species came out at.about 7.45 
p.m. and at 7.51 p.m. began its flight in under an elm tree at the northeast end of the 
island. The flight was generally forward, but continually from side to side for a few inches. 
The flight was quite irregular, always toward the slight north breeze. The whole swarm 
would often move away and return, a little later, to the first place. It swarmed within four 
feet of the ground, generally much lower, averaging, perhaps, two feet. . . . The 
number of individuals participating in the swarm was about twenty. Other species swarm- 
ing nearby at the same time were Chironomus hyperboreus, var. meridionalis, Joh., and the 
may-flies, Hphemerella exerucians Walsh, and Siphlonisca aerodromia Ndm. 
Genus Trentepohlia Bigot (named after J. J. Trentepohl) 
1854 Trentepohlia Bizot. Ann. Soc. Ent. France, p. 474. 
1911 Mongomioides Brun. Rec. Indian Mus., vol. 6, p. 296. 
1912 Mongomella Enderl. Zool. Jahrb., vol. 32, part 1, p. 61. 
Trentepohiia is a tropicopolitan genus including about fifty-five deseribcd 
species arranged in six subgenera — Trentepohlia Bigot, Anchimongoma 
Brun., Mongoma Westw., Plesiomongoma Brun., Paramongoma Brun., 
and Neomongoma Alex. Of these species, fifteen are American and the 
remainder are Old World forms. They are almost all species of delicate, 
ethereal structure, with long, slender legs. It is an interesting fact that 
Trentepohlia (Mongoma) pennipes has been observed by. Jacobson (De 
Meijere, 1911:50, and Edwards, 1912-13:211) to form chains on_hori- 
zontal spider webs, as is noted herein for Thrypticomyia (page 712) and 
somewhat similarly for Oropeza (page 982). H. K. Munro has sup- 
plied (in litt.) the following interesting notes on the habits of Trentepohlia 
(Trentepohlia) humeralis Alex. as observed in eastern Transvaal at the 
end of April, 1920: 
Very inconspicuous when flying and resting. When flying resembles very much a small 
piece of thistledown. Invariably settles on under side of twigs, leaves, and similar objects. 
Usually found among bushy undergrowth, but also in grass. When at rest the wings are 
folded along back; very often on settling the insect moves itself up and down in the manner 
of the long-legged harvest spiders (Phalangiidae). Slow flier. 
A fossil Trentepohlia, 7’. cruciferella (Ckll.), has been described from the 
Gurnet Bay Oligocene (Cockerell, 1917b: 373-874). Observations on the 
immature stages of three species are available. 
