JAMES CHESTER BRADLEY 327 



parian zones from Massachusetts to southern Florida. West- 

 '<v^ard it is known to Illinois, Oklahoma and Texas. I suspect 

 that there are two or even three closely allied species included 

 under the name castor, and hope to determine this point 'at a 

 later date. Castor is most probably the male of cypris and may 

 also include the male of sappho. 



Dasymutilla (Dasymutilla) ferrugata (Fabricius), 9 . 



1910. MuiiUa lieredd Rohwer, Proc. Ent. Soc. Wash., 12: 49, 9 . 



1912. Dasymutilla Jernujata var. hallabetei Rohwer, Proc. U. S. Nat. Mus., 41: 



456, 9. 

 1912. Dasymutilla georgiana Rohwer, Proc. U. S. Nat. Mus., 41 : 456, 9 . 

 1912. Dasxjimdilla plesia Rohwer, Proc. U. S. Nat. Mus., 41 : 456, 9 . 



A common species of the Carolinian and Austroriparian zones 

 from Massachusetts to southern Florida, westward to Nebraska 

 and Arizona. 



I have examined a large series from the eastern coastal states 

 from Long Island to Florida, and find a surprising amount of 

 variation in size, color, and structure. No line can be drawn 

 between these, although the extremes are very different. Some 

 individuals from Florida are so large and densely pubescent as to 

 suggest occidentalis in appearance, and in these the eyes are less 

 strongly gibbous, and the width of the thorax is from .17 to .30 

 in excess of the extreme width of the head, including the eyes. 

 There is a more or less gradual increase in the prominence of the 

 eyes, until the extreme represented by georgiana Rohwer is 

 reached. There is great but gradual reduction in general size, 

 and the reduction is not paralleled with an equal reduction in the 

 size of the head, so that we find the smaller individuals with the 

 thorax no wider than the head, eyes included, and this proportion 

 ranging to an excess of .3, as shown in the following measurements 

 of 33 specimens, given in millimeters. 



TR.\NS. AM. EXT. SOC, XLII. 



