364 



Say^s Descriptions of 



2. S. dubia. 



ferrug' 



with two yellow spots on the third segment. 

 Inhab. United States. 



r 



Body black : head and thorax immaculate : wings dark 

 violet-blue : cubital cellules two^ with no appearance of 

 more than one recurrent nervure : abdomen, first and 

 second segments black ; remaining segments ferruginous ; 

 more hairy, somewhat, than the others ; the third seg- ' 

 ment, however, more or less tinged with blackish and 

 with two transversely oval, a little oblique, bright yellow 



spots 



» 



Length four fifths of an inch. 



vanous 



parts of the Union. 



3. S. confluenta, Nob. (Western Quarterly Reporter). 

 I think it highly probable that Drury's fig. 5, pi. 44, vol. i, 

 is intended for this insect. I was deterred from quoting 

 this figure in consequence of its yellow head and four- 

 banded tergum ; but the head is truly, on its front and 

 base, covered with yellowish cinereous hair, as well as 

 the anterior part of the collar ; this may agree with 

 Drury's observation that the "head is of a pale yellov 

 in fi:ont" and " the neck is hairy and of a lemon color. 

 The species also probably varies in having four yellow 

 bands. Drury's figure is that of a female, and my speci- 

 men agrees with it in having an immaculate thorax and 



"f} 



?' 



fi 



he 



m reality, the female of this same species, and of course 



figu 



Drury 



and 



corresponding characters. I have no Index to the first 

 volume of Drury, but Fabriclus quotes the figure as 



