128 



1922, Caiidcll, Ins. Insc. Menst, X, 112, (authors D. & G.), Xylomiges(\). 



1923, B. & Benj., Ins. Insc. Menst, XI, 130, (author Sm.), Xylomiges(\). 

 The antennae and genitalia of all of the above forms are identical. 



There is a slight variation in the breadth of the tip of the uncus but 

 this appears to be individual. The presence or absence of the sub- 

 apical blackish shade is sexual, only an occasional male possessing it. 

 The shape of the orbicular can be used to sort this species from 

 perluhenis as noted under that name. At first it would seem that 

 pulchella must be a distinct species. The Barnes Collection possesses 

 seven males, eleven females, of typical pulchella from B. C. \^anc., 

 ("alif. and Alta. ; but two males and a female from Vancouver, a male 

 from Wellington, B. C, and another from Okanagan Falls, B. C, have 

 the basal area darkened, altho not black as in pulchella, being inter- 

 mediate to rubric a. 



Miistcl'ma is represented in the Barnes Collection by two male, 

 two female, paratypes ; a total of ten males, two females, from Wash., 

 Calif, and Colo. It is the reverse of pulchella, in the male appearing 

 almost evenly uncolorous, typically without trace of the dark basal 

 and subterminal areas. 



According to notes by Dr. McDunnough, the type of rnhrica, 

 altho stained, apparently represents an intermediate form which is 

 variable in color and maculation ; but is, typically, contrastingly marked, 

 altho varying from forms close to typical pulchella to smooth forms 

 indistinguishable from typical mustclina. The Barnes Collection con- 

 tains thirty-six males, twenty-one females, from B, C, Vane, Ore., 

 and Calif. 



Ruhriccidcs race nov., is, apparently, the main cause of the existing con- 

 fusion between perhibens and ruhrica. It is the form usually found in Colo- 

 rado and Utah. It is usually larger, heavier, and paler than rubrica with more 

 of a tendency for the transverse maculation to be obsolete. 



Expanse: 33-40 mm. ; H mm. being a runt from Utah, the average speci- 

 men measuring 40 mm. 



This form had, at some prior date, been sorted as a new species 

 in the Barnes Collection. 



Type localities and number and sexes of types: Holotype S, Glenwood 

 Springs. Colo., 1-7 May; Allotype 9, id., no date; \7 $ 2$ Paratypes, id., 

 various dates Apr., May, June; 1 9 Paratype, Colo. (Bruce); 5 5 1 $ Para- 

 tjT)es, Vineyard, Utah, April and May; 1 $ Paratype, Eureka, Utah, 29 May; 

 2 S Paratypes, Provo, Utah, 18 April. 



