852 CHARLES PauL ALEXANDER 
altho the segment is very short and is destitute of verticils; the seven 
succeeding flagellar segments are short-cylindrical, without verticils; the 
terminal two segments are more elongated and each bears about three 
very long hairs. 
Eriopterini: Normally there are 16 antennal segments in the tribe 
Eriopterini. In some genera both elongate and short antennae are found 
in the same group, as in Ormosia, sens. str. In Chionea, Cladura, Ptero- 
chionea, and Crypteria the number of antennal segments is reduced, due 
to the fusion of several segments to make up the basal segment of the 
flagellum —as in the case of Toxorhina, already discussed — this fusion 
segment including usually five segments. 
Limnophilini: In the tribe Limnophilini the antennae are normally 
16-segmented; in the genus Ula they are 17-segmented. In Limnophila 
and Epiphragma are found some species with elongate and others with 
short antennae. In Limnophila macrocera and some other species, the 
segments of the flagellum are provided with abundant outstretched hairs. 
In Adelphomyia cayuga the basal segments of the flagellum are fused into 
an indistinct fusion-segment; the other local species of this genus have 
normal antennae. 
Hexatomini: In Hexatoma megacera (fig. 125,G) the antennae of the 
male are 6-segmented, the flagellar segments being elongate; in the female 
(fig. 125, H) the antennae are apparently 8-segmented. In Hriocera there 
are many species with short antennae (Hriocera brachycera, E. fuliginosa, 
E. fultonensis, and others), species with the antennae intermediate in length 
(such as E. eriophora), and numerous species with greatly elongated 
antennae (H. spinosa, E. californica, E. longicornis, and others). In 
E. spinosa (fig. 125, r), E. longicornis, and others, the lower surface of the 
basal flagellar segment is provided with numerous spines, regularly spaced, 
pointing toward the tip of the organ; the manner in which these spines 
are used in extricating the organ from the antennal sheath of the pupa 
is described by Alexander and Lloyd (1914). In E. wilsona the antennae 
are likewise elongated in the male sex, but are provided with a strong 
pubescence, the spines being quite lacking. Most species of Hriocera 
have short antennae in both sexes. 
Pediciini: In the genera Pedicia and Tricyphona of the tribe Pediciini, 
the antennae are 16-segmented; in the genus Dicranota and the subgenera, 
