616 PROCEEDTNGS OF THE NATIONAL MUSEUM. vol.46. 



mined by Melichar; in the United States: Pennsylvania (Wirtner), 

 Massachusetts, New Hampshire, Wisconsin (Baker), Michigan, Illi- 

 nois, Wyoming (Metz), Nevada (Baker), Colorado (Baker). 



Megamelus detedus Van Duzee is apparently only a light-colored 

 form of this species. 



MEGAMELUS CONSIMILIS Van Duiee. 

 Plate 47, fig. M. 

 Liburnia consimilis Van Duzee '57:249. 



Average length of body, 2.6 mm. General color black to light 

 yellowish brown or even yellow; carinse of head and pronotum whit- 

 ish or yellowish; frons variable in color from almost uniform dark 

 brown between carinas (with a sUghtly hghter streak in each com- 

 partment) to yellow or yellowish brown between the brown or black 

 margins of carinse; apex of head usually entirely yellowish brown, 

 giving frons the appearance of being more oval than it really is; 

 antennae Ught brown, with apex of I and base of II dark; pronotum 

 more or less whitish; legs light brown, usually hneated with brown 

 or black. 



Very similar to M. peUucida, differing as follows: Vertex a little 

 longer; frons relatively broader, more oval, often about twice as long 

 as broad or even less; carinse less distinct on apex of head, sometimes 

 quite indistinct. Legs longer; hind tibiae longer than femora; cal- 

 car shorter, less distinctly dentate. Male genital segment similar; 

 aperture of pygofers distinctly smaller, more circular; styles shorter, 

 more slender, not flexed at tip, less divergent. 



Redescribed from more than 200 specimens of both sexes, about 

 half of the macropterous, from Colorado, Nevada, and CaUfornia 

 (coll. Baker), and two females from Washington, District of Colum- 

 bia. Since there are no males from the latter locahty, the identity 

 can not be certain, but the two specimens correspond very closely in 

 all respects to the western forms. 



MEGAMELUS GILLETTEI Van Duzee. 



Plate 47, fig. L. 

 Liburnia gillettei Van Duzee '97:258. 



Average length and proportions similar to M. pellucida, vertex 

 and frons a Uttle broader. General color black to brown or very 

 light brown; carinas of head and notum whitish or yellowish white; 

 frons deep black between carinae; vertex and pronotum blotched 

 irregularly brown and yellowish; scutellum similarly blotched or 

 often almost entirely black between carinae; abdomen blotched, con- 

 nexivum white; antennae black to Hght brown, in latter case apex of 

 I and base of II black; legs lineated with black or brown; elytra 

 slightly browned. 



