NATHAN BANKS. 43 



Type. — M. tortricoides ^= hirtus Fabr. 



This genus is very closely allied to Hemerobius ; no species occur 

 in the Eastern States. 



SYNOPSIS OF SPECIES. 



1. Upper half, at least, of outer gradate series brown ; inner gradate series brown 



nearly to radius :i 



Outer gradate series almost wholly pale; inner gradate series with several 

 pale veinlets on upper part, large species latiis. 



2. Venation denser; median forked between gradate series iiiceNf iim. 



Venation more open ; median not forked between gradate series. . • .niiiior. 



MegaloniUN latllS Banks. — Head pale brown; antennse rather paler; 

 thorax" darker brown; abdomen brown; legs yellowish. Wings hyaline, veins 

 densely dotted with biown ; dark spots alternate with pale around the margin, 

 first gradate series marked with black except near base, second series mostly 

 pale, a rather large blackish spoton middle of hind margin ; hind wings hyaline, 

 costal area and apical venation brown, also two brown spots on the hind margin. 

 Fore wings very broad, especially the costal area at base, five or six radial sec- 

 tors, the first soon forked, veins very close together; first gradate series straight, 

 oblique; second curved, following the outline of wing. In hind wings four 

 branches to radial sector, the costal cross-veins very numerous. Expanse 20 mm. 



Specimens from Las Vegas Hot Springs, New Mexico ; Williams, 

 Arizona, July; and Huachuca Mountains, Arizona. 



iflegaloiniis inoestns Banks. — Head pale shining brown, inouthpaits 

 yellowish; antennse pale; thorax brown; legs pale yellowish. Wings hyaline, 

 venation pale yellowish, dotted and spotted with brown, gradate veinlets entirely 

 brown, except some in lower half of outer series, costal and apical margin of 

 wings alternately brown and pale; a large dark spot on hind margin near end of 

 anal vein. Fore wings very broad, costal area very broad at base; five or six 

 radial sectors; the first soon forked ; all veins very close together; first gradate 

 series bent basad at middle, second curved, following outline of wing. Expanse 

 15 mm. 



Specimens from Santa Fe, New Mexico, July and August (Cock- 

 erell). 



j^Iegaloinus minor u sp.— Head pale yellowish, vertex with a dark me- 

 dian stripe; antennaj pale, rather darker beyond ; palpi, pale yellowish ; thorax 

 and abdomen dark brown; legs pale yellowish. Wings hyaline ; venation pale, 

 marked with brown, the longitudinal veins and costal veinlets interruptedly 

 brown and yellowish, the gradate series nearly black, and a black spot at the 

 anal angle, and a smaller one on cubitus toward base; margin with alternate 

 brown and white patches. Wings of usual shape; venation not as dense as in 

 allied species, five or six sectors, the first gradate series but little curved. Length 

 6 mm. 



TRANS. AM. ENT. SOC. X.X;XII. DECKMBER, 190.'). 



