56 ENTOMOLOGICAL NEWS [Feb., ’11 
hitherto described (Cf. Karsch, 1893, pp. 42, 48; Needham, 
1903), p. 220) have the first antennal joint very long, as long 
as all the other, or as several of the other, joints added together. 
Cora larva has the first antennal joint shorter than the second 
and in this respect, as in others mentioned below, shows a re- 
semblance to the Old World larvae described by Hagen (1880, 
p. xv) as pertaining to the legion Euphaea* of de Selys, and 
to a Mexican fragment doubtfully referred to Cora (I. c., p. 
xvi). 
The scales forming a more or less dense pile on different 
parts of the body of Cora larvae are structures which have 
met little or no notice in the literature on the Odonata. They 
occur in shapes varying from almost hair-like to that in which 
the width is at least more than half the length (Cf. Pl. I, 
figs. 4, 5, 11, 3 in the order named). The central and more or 
less arborescently-branched portion of each scale is thicker 
than the often hardly discernible marginal areas. 
Biramous mandibles hitherto have been noted only in 
Euphaea larvae of all the Odonata, and that very briefly 
(Needham, 19034, p. 743). I am not able at present to de- 
termine whether the two-branched condition there is the same 
as that here described for the larvae of Cora or not. The re- 
markable features of these mandibles is the possibility of inde- 
pendent movement of the inner branch along the dotted line 
shown in Pl. II, fig. 16, and the difference in the form of this 
branch in the right and left mandibles of the same individual 
noted above. Heymons (i896 3}, taf. II, fig. 29) has figured 
the mandibles in a young larva of Ephemera vulgata which 
are also two-branched but, in contrast to the larval mandible 
of Cora, the inner branch is larger than the outer. 
The very shallow median cleft of the median lobe of the 
labium was hardly to be expected in larvae so apparently 
primitive in other features as our Cora larvae are. In this 
respect also it agrees with Euphaea larvae, as far as can be 
* The name of the type genus of this legion, Euphaea, is now re- 
placed by Pseudophaea Kirby. 
