OF NATURAL HISTORY. 749 



2. S. DUBIA. — Black ; abdomen ferruginous behind with two 

 yellow spots on the third segment. 



Inhabits United States. 



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 segment, however, more or less tinged 

 with blackish and with two transversely oval, a little oblique, 

 bright yellow spots. 



Length four-fifths of an inch. 



A very fine, though rather common species, in various 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 con- 

 sequence 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 

 yellow, in front" 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 specimen agrees with 

 it in having an immaculate thorax and scutel, as in the fossulatia 

 Fabr., which I believe to be in reality the female of this same 

 species, and of course the same as that of Drury ; whereas he 

 quotes Drury's figure as that of radula F. which appears to be 

 the male, if I may judge by the " thorace maculate " and other 

 corresponding characters. I have no index to the first volume 

 of Drury, but Fabricius quotes the figure as [365] Sphex phmi- 

 pes Drury. If this be correct, Drury has the priority, and the 

 name and synonyms, will stand thus : 

 ScoUa plumlpcs Drury. 



" fossulana Fabr. | female). 



" radula Fabr. (male). 



" confiuenta Say, (female). 



1837.] 



