OF NATLUAL IIISTOIIY. 703 



miualbaiid; runuining Hogments with each a terminal capillary 

 band, more or less interrupted in the niitldlu; pohlerior Land 

 wider and somcwluit irregular : til)ioG yellow pali-, [382J <>ij tho 

 inner side and tip of the exterior side black : tarsi, anterior pair 

 dull yellowish ; posterior pairs, except at base, blacki«h : venter 

 immaculate. 



Length over two-fifths of an inch. 



Resembles C. descrta nob., but aside fn tlur differences it 



may be distinguished by that species having somewhat clearer 

 wings, and the inosculation of the first recurrent nervurc being 

 opposite to the middle of the second, or petiolated cubital cel- 

 lule; the antennae also in that species are yellowish before, 

 towards the base ; the scutel has two spots in addition to the 

 yellow line behind it, and the bands of tlie terguni are alwaya 

 broader than in the present species. The fallax nob. differs in 

 having the transverse yellow line on the scutel in a direct line 

 between the origin of the posterior wings ; whereas in the pre- 

 sent species it is behind the scutel. 



'2. C. SEXTA. — A broad band on each segment of the tcrgum ; 

 metathorax with a lateral spot. 



Inhabits Missouri. 



Body black ; head before, base of the mandibles and basal 

 joint of the antenna; beneath, yellow; third joint of the antennte 

 dull honey-yellow : collar witli two large yellow spots : wing- 

 scale and transverse line behind the scutel yellow; the triangular 

 impuncturcd space behind the transverse line very obvious, with 

 oblique lines and a longitudinal one in the middle : wings a little 

 fuliginous particularly on the margin and tip; nervures brown; 

 stigma yellow ; recurrent nervurc of the second cubital cellule 

 entering at its middle : metathorax with a large, oval, longitudi- 

 nal, yellow, lateral spot : tergum with a broad yellow band on 

 each segment ; that of the first or petiolar segment slightly in- 

 terrupted in the middle ; the two ultimate ones almost ferrugin- 

 ous : feet honey-yellow, [383] niore or le.>^s varied with bright 

 yellow : venter with interrupted bands. 



Length over half an inch. 



This was given to me by Nuttall. With the exception of 

 frontaia and bidcntaUi nob. this is the largest North American 

 1837.] 



