OSBORN AND BALL —STUDIES OF NORTH AMERICAN JASSOIDEA. 65 



second sector, the line separating the appendix from corium, and a spot 

 on the margin of each apical cell, black; legs and below, deep-green, 

 tarsi blackish at the tip. 



Genitalia; 9, ultimate segment twice wider than long, rounding, 

 or slightly produced with a slight notch; d^, valve long, parallel mar- 

 gined, rounding behind, angularly elevated along the median line. 



Described from numerous examples collected from the honey locust 

 at Ames and Sioux City, Iowa, and one from West Point, Neb. 



Larvae : Similar in form to the adult, very noticeable for their large 

 pronotum and the entire dorsal surface being covered with stout 

 hairs, bright-green, those on more exposed situations, brownish. 



This is a common species on the honey locust wherever it has been 

 examined, but has never been found elsewhere. Tiiere are two broods 

 in a year, the adults appearing in June and again in September. It 

 is intermediate in size between robustus and laeta, but differing from 

 both in venation and in the elytral hair being light-green. 



Bythoscopus distinctus V. D. (Plate II., Fig. 2.) 



General form similar to the preceding, about one- third smaller, head 

 green, reduced to a curved line bordering the rounding pronotum, 

 narrower than the dark-brown eyes. Pronotum greenish, coarsely 

 pitted with black, darker behind the eyes, scutellum triangular, green, 

 with the corners black, wings with a broad band at base, the tip and 

 a narrow band before it black; in light specimens the whole wing is 

 of a grayish slate except for a black spot in place of the middle band. 



Larvae: Stout green forms with thicker, blunter heads than the 

 adults, nearly straight-margined, with a few long hairs projecting for- 

 ward, body large, plump, abdomen ridged above, the sides with a flap- 

 like margin which fits around the sides of the leaf-stem, or twig upon 

 which the insect rests. 



This species occurs in abundance on black walnut and butternut and 

 adults have been found on hickory and hackberry, but only where they 

 were adjacent to the first -named trees. Full-grown larvae and freshly- 

 issued adults were found the second week in June; a i&v^ days later 

 the larvae had all issued, the adults remaining abundant until into 

 July. The second brood of larvae appeared before the middle of 

 August, the adults again in the latter part of September, to hibernate 

 and deposit eggs in the spring. 



