OSBORN AND BALL STUDIES OF NORTH AMERICAN JASSOIDEA. 99 



Strongest against the light stripe and fading out on the base and along 

 the costal margin, nervures and ramose lines reddish on the lighter 

 parts, apex of claval nerves and a pair of round spots between them, 

 white. 



Genitalia : ? , ultimate segment nearly three times wider than long, 

 posterior margin concave with a broad, truncate, or slightly notched 

 median tooth; pygofers about three times longer than the segment, 

 stout, ) ellowish with brown spots on the bases of the spines : d^, valve 

 long, rounding behind with an acute median tooth; plates broad, 

 slightly narrowing to the broad almost truncate apex, disc convex, 

 margins with long hairs. 



Described from one male and one female swept from second growth 

 oaks, Ames, Iowa. A very neat and distinct species. 



Phlepsius altus O. and B. (Plate VI., Fig. 3.) 



This species, described in our previous paper (Proc. la. Acad. Sci., 

 Vol. IV. ,p 228), has been taken during the summ.-r of 1S97 very 

 abundantly at a number of points in the northwestern part of the state 

 as well as at Ames. 



This is a shorter and stouter species than irroratiis, with a shorter, 

 rounder head and broader wings, which are usually flaring at the tip. 

 The head is only a little longer in the middle than next the eyes, 

 about half the length of the pronotum. General color, dark reddish- 

 brown, from the innumerable fine lines and spots on a light ground, a 

 number of clear white spots on the wings and a row of alternate white 

 and black spots on the outer margin. The species of this genus are 

 very much alike in color and it is only by careful study of structural 

 characters that they may be accurately separated. The short, broad 

 form of this species, however, separates it from most of the species oc- 

 curring here. 



The larvae are very broad and short, even more so than the adult, 

 the head being longer proportionately. They are of a dark grayish- 

 brown, sometimes with a reddish cast, being in fact dirt-color as near 

 as it can be imitated. 



They are found in abundance wherever Bauteloa hirsuta occurs. In 

 Iowa this grass is only found on very high prairie land, usually cap- 

 ping the tops of the hills, so that this species has a somewhat local 

 distribution. Further west where the grama grasses form a large share 

 of the grazing this species may be expected to occur very generally. 



