THe CrANE-Fuies 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; 0.8 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 Styringomyia 
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: 
