1887.] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 453 



A very distinct species, readily recognized by the pale color, the evi- 

 dent transverse lines and black tipjied collar. The primaries are tri- 

 gonate. The species is related to abifronssind lubricans in structure, and 

 the male will undoubted!}^ be found to have simple antenna and a single, 

 curved hook-like clasper. The unique 9 type is in Mr. Tepper's collec- 

 tion, 



A. sorror Smith, sp. uov. 



Anterior tibia spinose, armed at tip with four short claw-like spines. 

 Front with a short, acute, conical projection. Thorax depressed; abdo- 

 men flattened ; primaries elongate, narrow, subequal, obtuse. Color 

 of primaries gray, a more or less evident fuscous tint in median and 

 terminal space ; in the former not invading the costal region or hind 

 margin, and leaving a gray dash through submedian space. All be- 

 tween and before the ordinary spots blackish. A blq,ck sub-basal spot. 

 T. a. line geminate, dark, included space gray, not crossing costal space, 

 outwardly curved between veins. T. p. line single, crenulate, parallel 

 with outer margin. S. t. line gray, sinuate, marked by the dark terminal 

 space, and a preceding dark shade. Claviform very feintly outlined 

 concolorous. Ordinary spots gray with dusky center, outlined in black ; 

 moderate in size, normal in form. Head and thorax gray; collar with 

 a black line. Secondaries fuscous, veins dark marked. IBeneath gray, 

 powdery. Expands 1.4 inch (36-37™'"). 

 Habitat. — Montana. 



Two 2 specimens from Mr. JIulst furnish the types. The male char-' 

 acters will undoubtedly be found to be much like those of auxilliaris and 

 introferens, to the latter of which the new form is closely allied. In 

 this group, however, of which auxilliaris is typical, the si)ecies seem to 

 present absolutely no variation, and the apparent contrary shown in 

 some collections arises simply from the fact that two and sometimes 

 three species are very generally mixed. The maculation and habitus 

 is nearly alike, but structurally the species differ very decidedly in the 

 form of the ^ genitalia. 



A. proclivis Smith, sp. nov. 



Anterior tibia strongly spinose, terminal armature consisting of two 

 rather long claw like spines. Front broad, not much inflated; rough 

 granulate rather thaii tuberculate. Antenna of S simple, finely ciliate. 

 Primaries wide, apices rectangular. Thorax with low, divided fore and 

 aft tufts. Side pieces of 5 long and rather narrow, the tip rounded and 

 inwardly furnished with a row of spinules. Clasper with a short, acute 

 inferior projection and along, curved corneous superior hook, somewhat 

 enlarged at tip. Primaries dark smoky brown, with a purplish gloss. 

 Costal region broadly tinged with red brown ; a reddish suffusion ac- 

 companying the t. p. and s. t. line. T. a. line geminate, indistinct, up- 

 right to veins, then with a wide outward curve to hind margin. T. p. 

 line crenulate, narrow, single; itscour.se parallel with outer margin. 



