592 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.46. 



STENOCRANUS VITTATUS Stal. 

 Delphax vittata StAl '6^:315— Van Duzee '97:261. 

 This is apparently identical with ;S^. dorsalis Fitch, but it is hardly 

 advisable to make it synonymous until further evidence is obtainable. 

 It is without doubt a Stenocranus. 

 Locality. — Carolina and Pennsylvania. 



Genus MEGAMELANUS Ball. 



Similar in general appearance to Megamelus, differing chiefly in 

 cephalic characters. Head scarcely narrower than pronotum, 

 sharply angled dorso-ventrally at apex at union of vertex and frons, 

 produced distinctly beyond eyes ; vertex rather pentangular, appear- 

 ing often to be triangular because of prominent lateral carinje, with 

 an oblique carina (or semblance of one) on extreme apex extending 

 from median carina toward eyes; frons as broad above as below, 

 sides arcuate; clypeus convex, not or very feebly carinate; antennae 

 usually shorter than frons, terete; eyes emarginate beneath. Lateral 

 carinas of pronotum extending to hind margin or nearly so. Legs 

 rather short; hind tibiae usually about as long as femora; calcar 

 thicker and less foliaceous than in Megamelus. 



Type of genus. — Megamelanus hicolor Ball. 



This genus differs from Delphicinus in having the notum and frons 

 strongly carinate, while in the type species of DelpMcinus, D. meso- 

 melus Boheman, the carinae are almost obsolete. 



KEY TO THE SPECIES. 



a". Vert«>x very long, length beyond eyes greater than long diameter of eye; apex of 



head very acute elongatus Ball. 



a^. Vertex acute at apex, but not extending beyond eyes to such a length. 



6'. Dorsal surface of body with a red stripe on each side outside of lateral carinae, 

 extending entire length of body; body very long, more than 4 mm. 



rujivittatus Ball. 

 b"^. Body without red stripes on dorsal surface. 

 c''. Frontal carinae margined with brown; clypeus with traces of median carina. 



frontalis, new species, 

 c^. Frontal carinas without brown margins; clypeus without carinae. 

 (f' . Head, pronotum, scutellum and elytra yellowish, abdomen and venter 



black; body small hicolor Ball. 



(P. Color mostly black, not -white as aboAe. Body not small. . .spartini Osborn. 



MEGAMELANUS BICOLOR Ball. 

 Plate 45, figs. S, U ; plate 46, fig. A. 

 Megainclanus bicolor Ball '02: 265. 

 Length of body, 2 mm. ; width of vertex, 0.21 ; length to apex, 0.27 ; 

 width of frons, 0.24; antennae, I, 0.05, II, 0.13. General color black 

 and yellowish white, as follows: Frons, vertex, antennae, eyes, pro- 

 notum, scutellum, and elytra (brachypterous), yellow; clypeus, venter, 

 abdomen, legs (except tarsi and tips of femora and tibiae), black. Body 

 small. 



