1901.] NATUEAL SCIENCES OF PHILADELPHIA. 131 



lining lies still further posterior in the canal, and is finally voided 

 through the anus. 



The Gizzard of Various Adults. 



The position of the gizzard in the imago was found to vaiy from 

 the third abdominal segment to the seventh. In the majority of 

 forms examined the gizzard lies in the centre or posterior extremity 

 of the sixth segment; in a small number it lies in the fifth, in a 

 still smaller in the seventh, and in a very few io the third or 

 fourth segment. 



Variat^'ons in the position are frequently found in different 

 species of the same genus and even in different individuals of the 

 same species. 



A male of Caloj)tpryx apical'is had the gizzard in the anterior 

 end of the sixth segment, a female in the centre of the fifth; 

 while in a male of C. comelia it was located in the fifth segment. 



In a male of Phaon iridijyennis the gizzard was found in the 

 posterior end of the sixih segment; in a male of P. fuliginosus 

 in the third, and in a female of the same species in the sixth 

 segment. 



In four species of Ve-sfalis the position varied only from the 

 posterior end of the fifth to the middle of the sixth segment. 

 The same variation was seen in five species of Hetcerina, and like- 

 wise in four species of Euphcea. 



In the 9 of Libellago ealigata the gizzard was found in the 

 third segment, in tne d" in the fifth, and in L. curta, cf, in the 

 fourth segment. In four individuals — two species — of Micromerus 

 it was found in the fifih; in Thore boliviana, c?, in the centre of 

 the fifth, in ? in anterior end of seventh; in Eutliore hyalina, 

 d, in the anterior end of sixth, in $ in posterior end of fifth. 



Of the Agrionince, legion Pseudostigma, its position varied in 

 eight individuals, of five genera, from the middle of the sixth to 

 the anterior extremity of the seventh segment; in the Legion 

 Podagrion, in five males and one female of Paraphlebia sp. (group 

 of Zoe), the position varied only from the anterior end to the 

 centre of the sixth segment; in five species of the genus Hettra- 

 grioii, from the posteiicr end of the fifth to the anterior of the 

 seventh; in the legion Platycnemis, in four genera, the organ was 

 found \n the sixth or seventh segment; in the \Qg\on Protoneura 



