796 CHARLES PauL ALEXANDER 
heterogeneous assemblage, but in reality it constitutes a natural group. 
The tribe as herein arranged includes the old group Limnobiini, with the 
addition of several genera that were formerly distributed in the Antochini. 
The divisions of the tribe as now constituted are as follows: 
1. Limnobaria — including the old tribe Limnobiini. 
2. Ellipteraria — including the genus Elliptera. This is close to th 
preceding subtribe and may be a group belonging to it. 
3. Antocharia — including Antocha and presumably allied genera, as 
Orimargula, Orimarga, Diotrepha, and possibly others. 
4. Rhamphidaria — including Rhamphidia and its allies. 
5. Dicranoptycharia — including Dicranoptycha only. 
These groups are not far removed, phylogenetically, from the lowermost 
divisions of the Hexatomini, such as the Ularia and the Epiphragmaria, 
and the two tribes are unquestionably closer together than their arrange- 
ment on paper would indicate. The separation of the two major groups 
was made largely on the characters of the imagines. 
The larvae have the body terete, moderately elongate or very long and 
slender (Dicranoptycha). The abdominal segments are subdivided into 
a basal and a posterior ring, the former with transverse welts of micro- 
scopic chitinized points or hooks. In the Limnobaria and the Antocharia 
these welts occur on both the dorsal and ventral surfaces in the form of 
microscopic hooks; in the Ellipteraria they are on segments 3 to 9 on the 
. dorsal surface only, being indicated on the ventral surface but naked; 
in the Rhamphidaria the welts are ventral in position on segments 2 to 
7; in the Dicranoptycharia they are similar, on segments 2 to 8. The 
body in Dicranoptycha is entirely glabrous. 
The head capsule is of moderate to large size and is massive and com- 
pact, consisting of a narrow dorsal plate which is usually indented behind, 
and two broad mussel-shaped lateral plates which are connected ante- 
riorly across the venter to form the mental plate. The mental plate 
consists of an outer plate which usually terminates in a single median 
point, and behind this an inner plate which contributes additional teeth 
to the mentum. In Dicranoptycha there is but one subequal tooth on 
either side, with an additional much-reduced tooth; in Rhamphidia 
there are two teeth, and in the other groups there are usually four or five. 
The hypopharynx is usually a double plate united at the ends to form 
a collar, with the anterior margins finely toothed. The maxillae are 
