66 ENTOMOLOGICAL NEWS [Feb., '15 



It is probable that the teneral female of I. verticalis of May 

 13-22, 1904, is the homoeochromatic female cited above as of 

 May 22, 1904, although it is merely labeled "Phila., May 22, 

 1904." Although it was kept alive in captivity for at least eight 

 days, there is nothing in the notes to indicate that it was given 

 any food and in this respect, and in its more limited range of 

 movement, the experiment differed from those by Miss Lyon. 

 These differences may account for the absence of color 

 changes. 



The authors who have described the females of Tschnura 

 verticalis are the following: 



Say (1839) described a "slightly pruinose" female, but it is not pos- 

 sible to determine whether it was of the homoeochromatic or hetero- 

 chromatic form. In the original description, the signs $ and $ have 

 evidently been transposed, as the content and the first line of the 

 account of the true male indicate. LeConte (1859) in his edition has 

 retained these signs and has made the error worse by altering the 

 word "female" to "male" in the first line of the description of the 

 true male. 



Hagen (1861, page 76, under A. ramburii) very briefly described the* 

 heterochromatic female of such an age that "the whole of the abdom- 

 inal dorsum" had become "brassy-fuscous" and a still more aged 

 "pruinose" female which may have been originally homoeo- or hetero- 

 chromatic. 



Selys (1876) described an "adulte" and a "jeune" female, but there 

 is nothing in the descriptions to indicate to which of the forms we 

 have distinguished above they belonged. 



Provancher (1876) translates Hagen's description of 1861 under the 

 same name, Agrion ramburii. 



Calvert (1893) distinguished a "black" and an "orange" female. 

 Under the former heading he mentioned one as being "colored like $ 

 (teneral)"; this is the homoeochromatic female of the present paper 

 and some of the specimens on which this statement of 1893 was based 

 are still before me. The other females referred to as "black" were 

 said to have the "greater part of body pruinose," etc.; this would 

 apply equally well to aged homoeochromatic, or to aged heterochro- 

 matic, females. The "orange" females of 1803 were evidently hetero- 

 chromatic forms in which the blue of abdominal segments 8 and 9 

 had already been replaced by black. 



Needham (1898) figured a heterochromatic female of the same 

 degree of coloration. 



