1S87.] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 459 



bisinuate. T. p. line even, parallel with outer niargii), geminate, tlie 

 outer line punctiform. S. t. line very indefinite, pale, irregular. Ordi- 

 nary spots concolorous, outliued by a fewdark scales. Orbicularrouud. 

 Eeniform somewhat constricted at middle, inferiorly a little dusky. 

 ♦Secondaries dnsky, outwardly darkest. Beneath, grayish, powdery; 

 primaries darker, with a blackish extra discal line and discal spot. 

 Expands 1.3-1.4 inches (32-35™'"). 



Habitat. — Nevada, 



S and $ from collection of Dr. Bailey, and a darker $ in collection of 

 Tepper. The specimen in Mr. Tepper's collection is rather darker than 

 the others, and the maculation is obsolete. The species has rather 

 broad, trigonate primaries and is distinct from its allies of the pity- 

 chroiis group, to which it belongs. 



A. medialis Smith, sp. nov. 



Structural characters of tetrica and serricornis. Whitish gray to ocher 

 yellow, more or less irrorate with black scales. The transverse lines dif- 

 fuse, dark, powdery, geminate, even. S. t. line also rather broad, dif- 

 fuse, even. A difiuse dusky shade line through outer portion of median 

 space. Ordinary spots indefinite, dusky. Secondaries of $ white, of 

 9 dusky. Beneath white, sparsely powdered with gray; indefinite 

 gray discal spots and extra discal common line. Expands 1.5-1.6 

 inches (38-41™""). 



Habitat. — Texas. 



An easily recognized species belonging to the messoria grou[) ; but 

 most nearly allied to caenis ahdfenesica. It is easily recognized by the 

 pale color and even diffuse transverse lines. Several specimens, $ and 

 9 , in collection U. S. Nat. Mus. 



A. extranea Smith, sp. nov. 



Structural characters of trifasciata, which this species also resembles 

 in maculation. Primaries dark ash gray, the transverse lines dis- 

 tinct. Basal line evident. T. a. line faintly geminate, upright, scarcely 

 lunate between veins. T. p. line even, outwardly curved over cell, in- 

 wardly slightly sinuate to hind margin. The terminal space is some- 

 what darker shaded, relieving the concolorous, very irregular s. t. line. 

 A distinct diffuse median band, outwardly shaded so as to reach the t. 

 p. line and thus darken the outer third of median space. Ordinary 

 spots concolorous, distinctly outlined ; orbicular small, round ; reniform 

 elongate, upright, rather narrow. Secondaries 9 pale fuscous (? S 

 white). Beneath, fiisco luteous, powdery ; an indefinite common line 

 and discal lunule, darker. Expands 1.5 inches (38'"™). 



Habitat. — Montana. 



A single 9 specimen from Mr. Tepper. It is readily distinguished 

 from its near allies by the dark gray color audoutwardly darker median 

 space. Its place is between /ewe-sica and trifasciata. It has a casual 

 resemblance to the species oi Ammaconia. 



