848 CHARLES Pavu ALEXANDER 
number of segments from four in the generalized subgenus Tetraphana 
to one in the subgenus Monophana. In Elephantomyia (fig. 124, p), 
Rhampholimnobia, Ceratocheilus, and Toxorhina, the rostrum consists 
of a much elongated tube which bears the reduced mouth parts and the 
maxillary palpi at the extreme apex; in Elephantomyia the maxillary 
palpi are three-segmented, while in Toxorhina they are apparently single- 
segmented. 
Those species of Geranomyia, Elephantomyia, and Toxorhina whose 
feeding habits are known, all feed on the nectar of tubular flowers, such 
as the Compositae, the Apocynaceae, the Ericaceae, the Umbelliferae, the 
Rhamnaceae, and the Lauraceae. 
The maxillary palpi are generally four-segmented; in the primitive 
group Tanyderidae they are five-segmented. By reduction there are found 
one, two (fig. 124, a), three, or four segments, respectively, in the four 
subgenera of Geranomyia; there are three in Elephantomyia (fig. 124, p), 
and apparently only one in Toxorhina. The segments in most Limnobiinae 
are approximately subequal in size, but in the genus Pedicia and in the 
subfamily Tipulinae (fig. 124, ©) the fourth segment is greatly elongated, 
whiplash-like, and usually longer than the three preceding segments 
taken together. The labial palpi are two-segmented and conspicuous in 
species of Trentepohlia. 
The antennae 
The antennae of crane-flies present many interesting conditions, both 
in the number of the segments of which they are composed and in their 
structure, and many generic names have been based on these conditions — 
Trichocera, Rhipidia, Trimicra, Rhabdomastix, Sigmatomera, Ctedonia, 
Polymera, Hexatoma, Eriocera, Cylindrotoma, Phalacrocera, Megistocera, 
Ctenophora, and others. 
The antennae are inserted on the vertex between the compound eyes. 
-The diversity in their structure is considerable, and consists of great 
elongation of the organ, constriction of the segments, and the appearance 
of pectinations and flabellate formations. These are sexual characters 
only and are confined to the male sex. Elongation of the antennae occurs 
in many widely-separated tribes; moderate elongation is found in a wide 
range of native Ptychopteridae, in Trichocera, and in the tipuline genera 
Atarba, Ormosia, Molophilus, Limnophila, Penthoptera, Dicranota, 
