NATHAN BANKS. 45 



3. Gradate veinlets of inner series usually less, never much more, than length 



apart posticus. 



Gradate veinlets of inner series much more than length apart 4. 



4. Membrane of wing considerably infuscated in spots, veins mostly brown 



variolosns. 

 Membrane without dark spots, veins mostly pale subanticus. 



IVIicroinus aiigiilatiis Steph. — Head pale brown; thorax similar, with 

 darker patches on the lateral lobes ; abdomen brown; legs pale yellow, anterior 

 tibiff with brown marks on outer side. Wings hyaline; indistinctly marked 

 with wavy brown bands; venation pale, dotted and spotted with brown ; cross- 

 veins wholly brown, margin with alternate stretches of pale and brown ; hind 

 wings hyaline, venation pale, except brown at apex. Wings rather broad ; short 

 for length of abdomen; four radial sectors; the two gradate series even and 

 parallel, the next to last of inner series before previous one. Expanse 15 to 

 16 mm. 



Specimens from Fort Collins, Colorado ; Fraucouia and Mt. 

 Washington, New Hampshire (Slosson). Hagen recorded it from 

 the White Mountains and Canada. It is a mountain loving species 

 in Europe. 



.Ylicroniiis montanus Hagen.— Head dull yellowish; antennte pale 

 yellow; thorax yellowish, brown on sides; abdomen brown; legs pale yellow. 

 Wings hyaline; venation yellowish, marked with pale brown; cross-veins pale 

 brown; costal venation almost wholly pale; membrane with transverse brown 

 bands, those on gradate series most distinct; hind wings hyaline, venation 

 wholly pale yellow. Wings moderately broad; five radial sectors; next to last 

 veinlet of inner gradate series beyond the previous, rest of series even. Ex- 

 panse 20 to 22 mm. 



Specimens from Mt. Washington, New Hampshire (Slosson) ; 

 Beulah, New Mexico (Cockerell) ; Ormsby Co., Nevada (Baker) ; 

 and Kaslo, British Columbia (Currie). Hagen had it from Natick, 

 Massachusetts, and the White Mountains, July. It is extremely 

 close to the European M. paganus Linn. 



nicromus posticus Walk. — Head pale, marked with reddish on face 

 and vertex; antennae pale, darker toward tip; thorax brown, with some indis- 

 tinct pale spots; abdomen brown ; legs pale yellowish, tibiise with dark mark on 

 outer side near tip. Wings hyaline ; alternate brown and white patches around 

 margin; venation pale, marked with brown in dots and spaces; cross-veins 

 wholly brown; membrane of wing crossed by many wavy brown bands, most 

 distinct in outer posterior part; hind wings unmarked, venation reddish, except 

 pale on base, and cross-veins dark brown. Wings rather slender; four radial 

 sectors; next to last veinlet of inner gradate series is beyond the previous one, 

 otherwise the series is regular. Expanse 15 to 18 mm. 



TRANS. AM. KNT. SOC. XXXII. DECEMBER. 1905. 



