No.:i04l. THE INSECT FAMILY DELPHACIDAE— CRAWFORD. 621 



tips of pronotum laterad, antennae, legs and rostrum light brown; 

 posterior margin of two last tergites of abdomen white; elytra sub- 

 hyaline, veins brown. 



Head rather short, almost as broad as prothorax, weakly carinate 

 at apex; vertex moderately broad, sides straight; frons subrectan- 

 gular, slightly constricted above, about t^^'ice as long as broad; 

 antennae reaching about to clypeus, I half as long as II. Elytra 

 typical. Hind tibiae longer than femora; calcar rather small, scarcely 

 more than haK as long as basal tarsus, margin very finely dentate. 



Male genital segment large, prominent; aperture of pygofers elon- 

 gate, irregular, with a prominent, rounded flap projecting outward 

 and back on each side; styles long, acuminate, stout and broad (in 

 profile) basally, acute at apex, somewhat twisted, with a slender 

 process at base of each ; anal tube large, produced greatly ventrad 

 and terminating in two long teeth which overlap styles; anal style 

 horizontal. 



Described from four males, one semibrachypterous, from Colorado 

 (Baker). The genitalia of this species are very remarkable and 

 easily recognizable at a glance. 



Type-specimen— Ca.t. No. 15990, U.S.N.M. 



MEGAMELUS NIGRIGASTER, new species. 

 Plate 47, fig. U. 



Average length 2.8 mm.; width of vertex 0.25; width of frons 0.30; 

 antennae, I, 0.09, II, 0.19= General color abdomen black, thorax 

 brown, lighter on dorsum between carinse; frons and clypeus between 

 carinae black; carinse of head and notum white, median scutellar 

 carina broadly white; abdomen with several elongate rufous marks 

 laterad on dorsum, and connexivum and margin of ventral preanal 

 segment white; antennae, I brown to black, II light; legs light 

 brown, with more or less distinct brown lineations. 



Head narrower than prothorax, rather strongly carinate; vertex 

 rather broad, sides straight; frons less than twice as long as broad, 

 constricted above and at apex, sides shghtly sinuate; antennae 

 scarcely reaching to clypeus, I almost half as long as II. Notum 

 broad; elytra subhyahne. Legs stout; hind tibiae scarcely longer 

 than femora; calcar robust, rather thick, dentation fine, obscured 

 by pubescence. 



Male pygofers moderately long, aperture rather elongate-ovate, 

 irregular, deeply notched above; styles very short, thick, flexed 

 outward and acute at tip, reaching scarcely one-third of length of 

 aperture; anal tube large, subhorizontal; anal style very thick. 



Described from two brachypterous males from Colorado (Baker). 



Type-specimen.— Ca.t. No. 15991, U.S.N.M. 



