THE CANADIAN ENTOMOLOGIST. 265 



Described from one female from Coolidge, Kansas, and a pair from 

 Ames, Iowa, all collected by the author. 



Megamelanus, n. gen. 



Resembling Megamelus, but with the front of equal width above and 

 below and the vertex sharply angled in front. Resembling Delphacinus, 

 but with the side keels of the pronotum attaining the hind margin. 

 Vertex 5-angular, but. with the lateral foveae depressed and their inner 

 carina? strong and meeting at the sharp apex, giving it the appearance of 

 being acutely triangular ; front broad, nearly rectangular, median carina 

 distinct, not forked, a trifle the widest in the middle, the lateral margins 

 gently evenly curving, the apical margin carinate just above the deep 

 clypeal suture ; clypeus small, rounding, without carinas ; pronotum 

 shorter than vertex, strongly tricarinate, the lateral pair just inside and 

 parallel with those on vertex, extending to the posterior margin ; elytra 

 commonly brachypterous, covering the second abdominal segment. In 

 the macropterous form long and broadly rounding posteriorly ; venation 

 nearly as in Megamelus. 



Type of the genus M. bicolor. 



Megamelamts bicolor, n. sp. — General appearance of Delphacinus 

 mesomelas, but with a sharper vertex and straight lateral carinas on 

 pronotum. Length: macropterous form, 3 mm.; brachypterous, $, 2.5 

 mm.; ^ , 1.6 mm. 



Vertex flat, acutely triangular on the disc, slightly longer than the 

 pronotum, more than half its length in advance of the eyes ; median 

 carina weak, obsolete before the middle ; face slightly acutely angled with 

 the vertex; front nearly half longer than wide, the carinse sharp, narrow ; 

 pronotum sharply carinate, slightly emarginate posteriorly ; elytra one- 

 third longer than the vertex and pronotum in the brachypterous form, 

 their apices rounding ; nervures simple, distinct, distinctly longer than the 

 abdomen in the macropterous form, broadly rounding at apex, anteapical 

 cells variable, apical veinlets straight and simple. 



Colour : females varying from a pale to a very bright straw colour, 

 male pale straw colour ; elytra nearly white, the abdomen both above and 

 below clypeus and under side of thorax black. Legs black, the tip of 

 both femora and tibia? pale, tarsi pale. 



A few males were found that mimic the females in size and colour. 

 These were mostly parasitized, and it is possible that the others had 

 been. 



