1898.] NATURAL SCIENCES OF PHILADELPHIA. 143 



Subfamily LIBELLULINJE. 



2. Pantala flavescens Fabricius. 



Four males Glorioso Is., one of them dated Jan. 28, 1893. Four 

 males, eight females, Aldabra Is. 



3. Tramea basilaris Beauvois. 



Libellula basilaris Beauvois Ins. rec. Afrique et Amer. p. 171, pi. ii, f. 1, 1805' 

 Synonym? Tramea Burmeisteri Kirby, Trans. Zool. Soc London, xii, p. 316, 



1889. 



One male, four females, Glorioso Is., the male and one female 

 dated Jan. 29, 1893. 



Mr. Kirby states (I. c.) that his Burmeisteri is " nearly allied to 

 the African T. basilaris Beauv., in which, however (judging from 

 the single broken specimen before me), the yellow area on the hind 

 wings is much less extended, aud the opaque spaces (of which the 

 upper one is much more extended) is nearly black." 



In all these Glorioso individuals, the yellow area on the hind 

 wings extends from the base outward as far as the external angle 

 of the triangle ; in the male it reaches backward (caudad) to the 

 anal ' angle,' in the females back to three-fourths of the width of the 

 wing-base; as regards the extent of the yellow area, therefore, these 

 individuals have, in Mr. Kirby 's view, a character of Burmeisteri 

 rather than of basilaris. 



On the other hand, the upper basal band of the hind wings of 

 Burmeisteri fills up " more or less of the lower basal cell and part 

 of the wing below [the italics are mine] adjacent as far as the base 

 of the triangle" (Kirby, I. c). In these Glorioso females, but not 

 in the male, the blackish-brown fills up the basilar [median of Selys, 

 1896] space (=upper basal cell of Kirby), the subcostal space to 

 the first (1 9 ) or second (3 9) antecubital, and parts of the supra- 

 triangular space and of the triangle as well asthe "lower basal cell 

 and part of the wing below adjacent"; this distribution of the 

 dark color is a character of basilaris. In the Glorioso male the 

 brown on the hind wings is reddish-brown and therefore paler than 

 in the females; it fills the " lower basal cell and part of the wing 

 below adjacent " and extends into the triangle, and is separated from 

 a second, wider reddish-brown band extending from the inner mar- 

 gin to the distal subbasal sector although not actually touching 

 either margin or sector; this second band therefore does not "run 

 from the base of the sector of the triangle " as in Burmeisteri. 



