76 THE NAUTILUS. 
(23.) libellula ,2345 Ckll. ; , ; : Babe | 
(24.) libellula 00300 = cavieria Moq. : 1. (juv.) 
((25.) libellula 003(45) = gmelina Mog. Saal ania 
ginata) . : asd fs 
(26.) libellula 1(23)45 = abba Moa. } A di. 
(In this specimen bands 4 and 5 are very thick: the yellow 
line between 5 and 4 is very thin.) 
(27.) rubella 003X00 var. noy. : : ‘ . teGayrs 
(28.) rubella 12345 Mog. . , : : . 2. (one juv.) 
(29.) rubella 00300 = guettardia Moa. 1. (pale.) 
(30.) rubella 00000 = rubella Mog. ele 
(31.) rubella 00305 Ckll. : : : ‘ we le 
(32.) petiveria 12345 = brissonia Mogq. 5 
(33.) petiverta 123(45) = arcelinia Locard. (one ae 
band 2 very broad) (one juv.) 
(34.) petiveria 1(23)3(45) v. nov. . : : LC pave) 
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, which frequents exceedingly dry places 
(sand hills, ete.), 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 i 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.) libellula 1,345 Roebuck. (juv.) 
(2.) libellula 10345 CkIL. 
(3.) libellula 12;(45) v. nov. (juv.) 
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