N0.UU41. THE INSECT FAMILY DELPHACIDAE— CRAWFORD. 615 



than broad; carinse moderately distinct; antennae reaching about to 

 clypeus, I nearly half as long as II. Eyes large. 



Pronotum moderately long, straight in front, scarcely emarginate 

 behind; lateral carinas curved outward, not reaching hind margin. 

 Legs rather stout, hind tibiae a httle longer than femora; calcar about 

 three-fourths as long as basal tarsus, pubescent. Male abdomen 

 stout, broad; pygofers large, aperture irregular on margin, produced 

 on each side of base of styles into a large process, acute at tip; anal 

 tube very large, produced ventrad into a pair of very long and acute 

 processes, with the serrate tip of penis between them; genital styles 

 stout, cultrate, roundly acute at tip, divergent strongly. 



Described from one brachypterous male from Colorado (Baker). 



Tyj>e-speciraen.— Cat. No. 15986, U.S.N.M. 



MEGAMELUS PELLUCIDUS FabricluB. 



Plate 47, figs. N, 0; plate 49, fig. I. 



Fulgora pellucida Fabricius. 



Delphax pellucida Fabricius '0-5:84. — Fieber '66: fig. 8. — Oshanin '07:342. 



Liburnia pellucida Fieber '7i: 5.— Edwards '96:58.— Van Duzee '97:247.— 



OsBORN '0.^:100. 

 Liburnia arvensis Fitch '95:386 (Lintner). — Van Duzee '97:248. 

 Liburnia fur cata Provancher '59:225. — Van Duzee '97:248. 

 Liburnia detecta Van Duzee '97:248. 



Length of body, 2.9 mm.; width of vertex, 0.24; width of frons, 

 0.26; antennae, I, 0.10, II, 0.24. General color black to brown, some- 

 times pale yellowish brown, males usually darker than females. 



Male. — Frontal carinas, most of pronotum, margin of scutellum, 

 connexivum whitish or yellowish white; frons deep black; second 

 antennal segment (sometimes part of I), tibiae, tarsi, and sometimes 

 femora light brown; elytra shghtly browned, veins black, apical mar- 

 gin heavy, black. 



Female. — Often pale yellowish brown, more variable than male. 



Head narrower than prothorax; vertex short; frons subrectangu- 

 lar, broadest at middle, slightly constricted above, a Httle more than 

 twice as long as broad; antennae reaching about to clypeus, I nearly 

 half as long as II. Scutellum long; hind tibiae scarcely longer than 

 femora; calcar large, often nearly as long as basal tarsus, margin 

 finely but distinctly dentate. Macropterous forms predominating. 



Male genital segment moderately large, rather broad, subcyhndri- 

 cal; aperture broad, pentagonal, broadest sub-basally, with a fossa 

 beneath genital styles; ventral notch deep, prominent; styles long, 

 simple, acuminate, inflexed at apex to fit angle of aperture; anal tube 

 dorsal or subdorsal, with two short, slender, approximate processes 

 on ventral margin; anal style short. 



Redescribed from numerous specimens of both sexes from the 

 following locahties: Several males and females from Austria, deter- 



