76 THE XAUTILUS. 



(23.) UhelluJa ,2345 Ckll 1. 



(24.) Uhellula 00300 = cavieria Moq. ... 1. ( juv.) 



(25.) lihelhda 003(45) = gmeUna^io(\. (also bimar- 



ginatci) . . . . . .1. 



(26.) libellala 1(23)45 = ivoodia Moq. . . .1. 



(In this specimen bands 4 and 5 are very thick ; the yellow 

 line between 3 and 4 is very thin.) 



(27.) rubella 003X00 var. nov 1. (juv.) 



(28.) rw^»e/fo 12345 Moq 2. (one juv.) 



(29.) rubella OiiSOO ^ gucttardia Moq. . . . 1. (pale.) 

 (30.) rubella 00000 = rubella Moq. . . .1. 



(31.) rubella 0030o Ckll 1. 



(32.) petiveria 12345 = brissonia Moq. . . .5. 

 (33.) petiveria 123(45) = areelinia Locard. (one has 



band 2 very broad) . . .3. (one juv.) 

 (34.)7jein'ena 1(23)3(45) V. nov 1- (j»v.) 



All the above varieties have been found in Europe except Nos. 

 7 to 11, 16, 17, 27 and 34. The tendency of bands 4 and 5 to 

 coalesce is notable in the series, but this is a frequent form of 

 variation. The formula 00300, generally common in Europe, 

 seems rare. But the most remarkable thing about the series is the 

 splitting up of the bands in many specimens, forming combinations 

 which I have never seen in European examples. This is perhaps 

 to be regarded as the reverse of melanism, and due to dryness (I do 

 not know the degree of moisture at Lexington), and it is well to 

 remember that H. pisana, Avhich frequents exceedingly dry places 

 (sand hills, etc.), shows this splitting-up of the bands to excess. 

 These new varieties are very diverse, and as yet few in number of 

 specimens in the colony, which tends to show that they are of recent 

 origin. If, as I believe, they are the direct result of the new 

 environment, in a few years we shall see them predominate at 

 Lexington, and probably more pronounced in their characters, not 

 showing so many ill-developed bands. Here is a problem for the 

 future ! 



Since I wrote last about this species, Prof Morrison has sent me 

 the following additional varieties from Lexington, Va., new to the 

 North American Fauna : 



(1.) libellnla 1,345 Roebuck, (juv.) 



(2.) libellula IO345 Ckll. 



(3.) libellala 123(45) v. nov. (juv.) 



i 



