342 



PROCEEDINGS OP THE NATIONAL MUSEUM. 



VOL. XXXII. 



iiiaroiu with three spines and on the inner margin with one or two 

 spines or unarmed; posterior femora more than two times as long as 

 the pronotum and much swollen on the basal two-thirds, usually 

 armed on the apical half beneath, on the inner carina with a number of 

 small sharp spinules, but sometimes very minute or wholly al)sent. 

 Abdomen large and plump, scarcely carinate above; cerci of the male 

 about four times as long as the basal breadth, bent inward on the apical 

 third and on the curved outer margin with a blunt tooth not as long 

 as the circal width at that point (tig. 42), of the female simple, taper- 

 ing to a sharp point, about three or three and one-half times as long 

 as the ])asal width; ovipositor varying from one-sixth shorter to 

 slightl}^ longer than the posterior femora, nearly straight in the basal 

 two-thirds, apicall}^ very moderately curved upward. 



.^^^ 



Figs. 41, 42. — Stipator AMERirANi's. 41, adui.t mai.k. 42, certits of mat,e. 



Genei-al color yellow, the tip of the ovi])ositor usually infuscated, 

 the elytra of tiie males blackish, with yellow outer and apical margins; 

 the disk of the pronotum (fig. 41) has the posterior margin 1)lack and 

 behind the transverse sulcus marked on either side of the median 

 carina with a broad black Ixuid, usually very conspicuous, seldom 

 obscure, and very rarely indistinct or missing. The general color is 

 sometimes much darker than usual, but usually it is distinctl}" j^ellow. 



Jllra^iirt'mcnts. — Length, pronotum, male, 11-14 nun., female, 11-16; 

 posterior femora, male, 24-32; female, 26-39; ovipositor, 25-32; cerci 

 of male, 3. 



Specimens examined. — A large number of specimens of both sexes, 

 both adult and immature, from various regions in the middle and 

 southern United States. 



