56 ENTOMOLOGICAL NEWS [Feb., 'll 



hitherto described (Cf. Karsch, 1893, pp. 42, 48; Needham, 

 I 93^ 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. Ixv) as pertaining to the legion Euphaea* of de Selys, and 

 to a Mexican fragment doubtfully referred to Cora (1. c., p. 

 Ixvi). 



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 II, 

 figs. 4, 5, n, 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, 19030, 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 (1896 b, 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 Psendophaea Kirby. 



