112 PROCEEDINGS OF THE NATIONAL MVSEU^M. vol.xxi. 



hardly protuberant, tbe palpi are well developed and reach to the mid- 

 dle of the front or even a little above. The anterior legs of tlie male 

 are slender, the femur a little dilated at the base, the epiphysis of the 

 tibia situated well toward the base. The harpes of the male are 

 obloug, even, and evenly rounded at the tip. The clasper is rather 

 slender, with a short, pointed, beak-like tip. From the middle of the 

 upper margin is a moderate, ijointed, straight process. 



ACRONYCTA REVELLATA, new species. 

 (Plate XXI, fig. 10, male geuitalia.) 



Ground color a bluish ash gray. Head and thorax without special 

 markings. Primaries with the ordinary maculation fairly well defined. 

 Basal line brown, geminate, marked on the costa, and sometimes trace- 

 able to the basal dash. Transverse anterior line geminate on the costa, 

 but beyond that point the outer line is obsolete, leaving only the inner 

 black line, which is best marked from the subcostal to the submedian 

 vein. As a whole, it is outwardly oblique, a little drawn in on the basal 

 streak. The transverse posterior line is single, black, outwardly shaded 

 with brown s(tales, bent outwardly over the cell, toothed on veins 3 and 

 4, and to a less extent on vein 1. There is a i)ale, undefined sub- 

 terminal line, which is evident in proportion to the darkness of the 

 terminal space. Tliere is a series of blackish terminal lunules, beyond 

 which the fringes are cut with brown. Basal streak black, distinct, 

 extending through the transverse anterior line and almost meeting the 

 black dash which crosses the transverse i)osterior line and reaches the 

 margin above the anal angle. The basal dash has a short spur infe- 

 riorly at about its middle. Vein 1 lias a black dash or shade accom- 

 panying it through the median space. The ordinary spots are fairly 

 well marked; the orbicular round or nearly so, ringed by blackish 

 scales; the reniform moderate in size, kidney shaped, a little marked 

 with brownish scales. Secondaries white, with a faint yellowish tinge; 

 in tbe female smoky outwardly. Beneath, white, more or less powdery, 

 with a variably evident outer mark and discal spot, which is not marked 

 in the males. 



Expanse, 1.50 to l.GO inches (37 to 40 mm.). 



Habitat. — Glen wood Springs, Colorado, in June; Salida, Colorado, 

 7,500 feet; Washington. 



Four males and one female are represented in the series before me, 

 and as a whole the species is much larger and broader- winged than in 

 grisva. It has much the same ground color and much the same pattern 

 of maculation. It is a little darker, however, and it has the black dash 

 opposite the anal angle much more prominent and heavier than in any 

 specimen of (pusca that I have seen. The head is small, well applied 

 to the thorax, tbe front convex, but hardly bulging; the imlin distinct, 

 free from the front, and reaching to the middle or above. The harpes 

 of the male are broad, a little narrowed to the tip, which is rounded. 



