The Crane-Flies of New York — Part II 943 



on the swarming habits of this species have been pubHshed (Alexander, 

 1912 a: 72-73): 



On June 13, 1000, T found the species swarminj? [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 tlu^ 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 Chironormis hyperhnreua, var. meridional is, Joh., and the 

 may-flies, Ephemerella excrucians Walsh, and Siphlonisca aerodromia Ndm. 



Genus Trentepohlia Bigot (named after J. J. Trentepohl) 



1854 Trentepohlia Bi'jot. Ann. Soc. Ent. France, p. 474. 

 1011 Mongomioides Brun. Rec. Indian Mus., vol. 6, p. 296. 

 1912 Mongomella Enderl. Zool. Jahrb., vol. 32, part 1, p. Gl. 



Trentepohlia is a tropicopolitan genus including about fifty-five described 

 species arranged in six subgenera — Trentepohlia Bigot, Anchimongoma 

 Brun., Mongoma Westw., Plesiomongoma Brun., Paramongoma Brun., 

 and Neomongoraa 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) pennrpes 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 Thrj^pticomyia (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, T. cruciferella (Ckll.), has been described from the 

 Gurnet Bay Oligocene (Cockerell, 1917b: 373-374). Observations on the 

 immature stages of three species are available. 



