THE CRANE-FLIES OF NEW YORK PART II 959 



In a letter dated April 10 of the same year, however, the following 

 notes were enclosed: 



About forty-five eggs deposited in tube December 5, 1910. Chorion jet black, shining and 

 thick, resisting dryness, 0.3 mm. by 0.15 mm., very finely parallel-striate. 



One hatched December 10. The batch was placed with rotten apples and cow manure, 

 hatching December 15. Larva long, head small, mandibles distinct and well chitinized! 



An adult male emerged about January 21, 1911. 



Mr. Swezey, thru whose kindness the above notes are available, adds: 

 "You see from the notes of Terry's that he did not breed Stynngomyia 

 didyma in its natural habitat. That is yet unknown, I guess." 



The striking feature of this life history is its brevity, the entire egg, 

 larval, and pupal stages being passed in about a month and a half. The 

 writer knows of no other crane-flies in which this is equaled, its nearest 

 approach presumably being in the smaller Eriopterini. 



SUBFAMILY* Cylindrotominae 



The subfamily Cylindrotominae constitutes a small, isolated group of 

 crane-flies, with twenty described species arranged in seven recent genera. 

 All the species are Holarctic in their distribution with the exception of 

 five species of the Oriental genera Stibadocera EnderL, Stibadocerella 

 Brun., and Agastomyia de Meij. The group is a decadent one, having 

 been much better developed in the early and middle Tertiaries than at 

 present (page 764). 



The adult flies are sluggish in their habits, occurring on vegetation 

 in cool, shaded spots. The species of Cylindrotoma are brightly colored, 

 yellow and black, but the other forms are somber in appearance and 

 black or dark in color, the body being in some cases highly polished or 

 metallic. The immature stages of the Cylindrotominae differ from those 

 of all other Tipulidae, so far as is known to the writer, in being spent 

 on various bryophytic and spermatophytic plants, on the leaves of which 

 the larvae feed. The larvae are usually bright green in color and suggest 

 a caterpillar in their general form. Most of them simulate their host 

 plants to an astonishing degree. The immature stages of Cylindrotoma 

 and Liogma are terrestrial, while those of Triogma and Phalacrocera are 

 aquatic or nearly so. 



The genera of the subfamily Cylindrotominae may be separated as 

 follows : 



