THE CRANE-FLIES OF NEW YORK PART II 943 



een PUbHshed (Alexander, 



IQl 



number of individuals participating in the swarm was about twenty %tW species swam 

 mg nearby at the same time were Chironomus hyperboreus, var. rid*mfa Joh anTthe 

 mayflies, Ephemerella exerucians Walsh, and Siphlonisca aerodromia Ndm. 



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



1854 Trentepohlia Biojot. Ann. Soc. Ent. France p 474 



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

 912 Mongomella Enderl. Zool. Jahrb., vol. 32, part 1,' p. 61. 



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 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 

 lolded along back; very often on settling the insect moves itself up and down in the manner 



the long-legged harvest spiders (Phalangiidae). Slow flier. 



I 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. 



