Tue CRANE-FLIES oF New YorK—Part I 849 
Nephrotoma, and Tipula; great elongation, in which the organ may 
be two or more times as long as the whole body, is found in a few native 
species of Eriocera (fig. 125, F), and in some exotic genera, as Rhabdo- 
mastix, sens. str., the Old World species of Megistocera, and a few species 
of Macromastix. The flagellar segments are constricted at their middle 
in the genus Polymera, producing the multi-segmented appearance which 
gives the genus its name; in Sigmatomera some of the flagellar segments 
are reniform or shaped like a recumbent 8. In many species of Ormosia 
(O. monticola, O. divergens, O. megacera, O. mesocera) the elongated antennae 
are subnodulose and strongly suggest the beadlike condition obtaining in 
the Cecidomyiidae. In Trimicra the three terminal segments are abruptly 
smaller than the remainder of the flagellum; in some species of Stygeropis 
it is the terminal segment only that is so reduced. Pectinations and 
flabellate formations are found in the antennae in many genera — Rhipidia 
(fig. 125, a and B), Gynoplistia, Cerozodia, Ctedonia, most of the genera 
of the tribe Ctenophorini (fig. 125, and m), and several genera of the 
tribe Tipulini, such as Ptilogyna and Ozodicera. 
The two basal segments of the antennae are quite different in shape 
from those that follow, and are called the scapus, or scape. The scape 
is often considerably enlarged, especially in those species with elongate 
antennae — in the genera Rhabdomastix, Eriocera (fig. 125, r), Megisto- 
cera, and others. The second segment of the scape is usually shorter than 
the first, and in the species with elongate antennae it is usually short 
and cup-shaped (fig. 125, F, Gc, and H), a condition known as cyathiform. 
The whiplike part beyond the scape is the flagellum. The flagellum is 
almost always clothed with a pubescence of varying character, from 
straight to uncinate, from appressed to outspreading and divergent, 
from short to long, and often longer in the male sex than in the female. 
In addition to these delicate hairs there are usually strong, bristle-like 
hairs arranged in a more or less complete whorl, or verticil (fig. 125, 5 
and 0). The Tipulinae (fig. 125, t-o) have a more or less complete whorl 
of these strong hairs, which are absent in Stygeropis (fig. 125, nN) and in 
Holorusia and form good generic characters in a difficult group of the 
family. In many species of Gonomyia (G. sulphurella [fig. 125, 5], 
G. manca, G. pleuralis, G. amazona, and others), and in some species 
of Erioptera (subgenus Empeda), the verticillate hairs on the male 
antennae are exceedingly elongated and conspicuous. 
