H. C. FALL 459 



Elytra with the punctures in nearly regular rows, striae distinctly impressed 

 laterally, more finely so toward the suture, intervals finely transversely 

 wrinkled, shield wanting; eighth stria not interrupted near the base, marginal 

 interspace inipunctate or nearly so; black vittae typically rather narrow but 

 frequently wide, the outer one beginning on the seventh and eighth interspaces 

 and ending on the sixth and seventh. 



Pygidium black with large yellow apical spots. Body beneath black, last 

 ventral apically yellow. Legs yellow. 



Length 2.5 to 3.9 mm.; width 1.35 to 2 mm. 



Distribution. — Kansas: Meade, June 12 (Knaus), type c? ; Medora, May; 

 McPherson; Onaga, June 16; "So. Kan" (all in Knaus Coll.); Clark Co., Jime; 

 Hamilton Co. ; Wallace Co. ; Douglas Co. ; Sedgwick Co., June (all in Snow Coll.) ; 

 W. Kan (Popenoe — Nat. Mus. Coll.); Ks. (\Mlliston in Horn Coll.). Texas: 

 (Hubbard & Schwarz). Colorado: (Snow), (Leng Coll.), (Nat. Mus. Coll.); 

 Pagosa Springs, July (Baker — Nat. Mus. Coll.). Montana: (Leng Coll.), 

 (Schaeffer Coll.); Glasgow, June 27. New Mexico: Beulah, June 29 (Am. Ent. 

 Soc. Coll.);N.Mex. (Dury). 



Var. difficilis new variety. 



Front more black than yellow; prothorax heavily marked, the 

 sides, two basal spots and the median line anteriorly yellow; 

 elytra black with a narrow suljsutural vitta, — sometimes im- 

 perfect — a small basal intrahumeral spot and the side and apical 

 margins, yellow. The prothorax is nearly similar in form and 

 sculpture to the type form, and is — so far as my experience goes 

 — never so strongly transverse as in some Montana and Colorado 

 examples of true autolycus, nor does the punctuation show any ten- 

 dency toward strigositj' laterally as in some of these latter. Cer- 

 tain examples of true autolycus approach the present form in their 

 wider and more approximate discal vittae, and I am unable to 

 consider this as anything more than a varietal form in which the 

 vittae become fused, leaving only the intrahumeral spot and 

 occasionally some slight discal traces to represent the intermediate 

 yellow vitta. 



Distribution. — Massachusetts: Tyngsboro, July 5, cf type. Maine: \\"ales, 

 June 19 (Frost). Michigan: Detroit (Hubbard & Schwarz). Colorado: 

 Rabbit Ears Pass, 10,000 feet, July 21 (Liebeck Coll.). Arizona: Ash Fork, 

 June 18 (Barber & Schwarz); apparently not at all different from the eastern 

 specimens. 



Var. wahsatchensis new variety 



This name is assigned to a local race which is closel}^ similar to 

 difficilis, but differing constantly in the numerous specimens 



TRAXS A.M. ENT. SOC, XLI. 



