86 DAVENPORT ACADEMY OF NATURAL SCIENCES. 



a narrow fuscous band. Venation distinct, claval nervures nearly- 

 parallel, the outer one joined to the suture by a cross nervure before 

 the middle, inner branch of first sector joined to the second by two 

 cross nervures, central anteapical cell elongate posteriorly, constricted 

 in the middle and divided by a cross- nervure, posterior portion broad- 

 est, anteapicals on either side short, the inner one larger and diamond- 

 shaped. 



Color: Above grayish olive, nervures of elytra lighter with narrow 

 brown margins, eyes black, vertex yellowish-olive; a medially inter- 

 rupted transverse black band, widest at the margin, arises just before 

 the eyes and above the white-margined ocelli ; tij) with two median 

 black spots formed by the median light line and a yellowish transverse 

 arc. Front brownish-olive with pale arcs, lower part of face decidedly 

 yellowish, legs yellow, tergum and venter black, the posterior margins 

 of the segments lined with white. 



Brachyterous form: Structurally as above except that the elytra are 

 scarcely longer than broad, truncate behind, only covering the third 

 segment of the abdomen, the under wings rudimentary; the venation 

 is nearly the same as on the basal part of the long wing, though it is 

 cut off just back of the cross-nervure. In some examples there is a 

 nervure just within the apical margin but no apical cells. Color as 

 above with a slightly reddish cast; behind the elytra the abdomen is 

 shining black with broad white margins to the segments. 



Genitalia. ? ultimate ventral segment about three times wider than 

 long, the lateral margin rounding in to the lateral angles, posterior 

 margin shallowly excavated nearlv its entire length with a broad trun- 

 cate or slightly notched median tooth equalling the lateral angles, 

 pygofers stout, not inflated, tipped with stout yellow hairs that exceed 

 the ovipositor. 



S abdomen rather long, valve broad and short, not longer than the 

 ultimate segment, plates wider than valve at base, rapidly roundingly 

 narrowing to the long attenuate points, margined with stout hairs, 

 pygofer broad at base, short and rounding behind. 



Described from nine males and thirteen females collected from a high 

 knoll at Little Rock, Iowa, July 2d 



This species does not appear to be strictly congeneric with catalina, 

 but more nearly related here than to any existing genus. Its generic 

 value seems still too uncertain to warrant the formation of a new 

 genus. 



