248 BEUTENMULLER, MONOGRAPH OF THE SESIID^E. 



Memythrus denotatus {Hy. Edw.). 



Plate XXX, Fig. i, Female. 



Albuna denotata Hy. Edwards, Papilio, Vol II, 1882, p. 55 ; Grote, New Check List N. Am. 



Moths, 1882, p. 12. 

 Sciapteron denotata Beutenmuller, Bull. Am. Mus. Nat. Hist. Vol. IV, 1892, p. 171 ; ibid. Vol. V, 



1893, p. 24 ; ibid. Vol. VIII, 1896, p. 119. 



Male.— Head black ; palpi black with the tips inside yellow ; collar glistening, violet black, 

 narrowly edged with yellow in front and at each side behind ; orbits of eyes pure white. Antennae 

 steel blue above, ferruginous beneath. Thorax blue black, edged on each side behind with a little 

 yellow. On each side beneath the fore wings is a small yellow spot which is contiguous with the 

 one at the base of the wings. Abdomen deep black with a bluish reflection, second, third, fourth, 

 and last two segments, , each with a broad yellow band. Anal tuft black with a very few yellow 

 hairs. Legs black, middle and hind tibiae partly orange ; the latter yellow inside ; tarsi orange. 

 Fore wings opaque, violet black with a transparent streak at the base, and reddish along the inner 

 margin. Hind wings transparent, with an opalescent lustre ; discal mark and narrow margin violet 

 black. Fore wings beneath washed with yellow and traces of an orange discal mark. 



Female. — Same as the male, with the abdomen more robust. 



Expanse : Male and female, 26-28 mm. 



Habitat. — Montana, Colorado, Texas. 



Types : One male and two females. Coll. Hy. Edwards, Am. Mus. Nat. Hist. 



Closely allied to M. tricinctus of which it may possibly be a variety. It 

 agrees with it in color except that there is a yellow band on each segment in 

 both sexes, while in tricinctus the male has four and the female three bands. 



Memythrus robinise {Hy. Edw.). 



Plate XXIX, Fig. 15, Female. 



Sciapteron robinice Hy. Edwards, Bull. Brooklyn Ent. Soc. Vol. Ill, 1880, p. 72 ; Packard, Ins. 

 Inj. For. and Sh. Trees, Bull. No. 7 U. S. Ent. Com. i88r, pp. 103, 127, 261 ; 5th Rep. U. 

 S. Ent. Com. 1890, p. 360; Grote, New Check List N. Am. Moths, 1882, p. 11 ; Riley, 

 Proc. Ent. Soc. Wash. Vol. I, 1888, p. 85 ; Insect Life, Vol. II, 1889, p. 18 ; Beutenmuller, 

 Bull. Am. Mus. Nat. Hist. Vol. VI, 1892, p. 171 ; ibid. Vol. VIII, 1896, p. 120 ; ibid. Vol. 

 IX, 1897, p. 218. 



Male. — Head and palpi yellow. Collar black edged with yellow in front and behind. Anten- 

 nae orange brown. Thorax deep black ; the patagia tipped with yellow at the posterior edge, and a 

 transverse curved line across the hind part of the thorax. Abdomen with the first three segments 

 above and below deep black, second with a narrow yellow band and the third with only a slight 

 yellow ring at the posterior edge ; remaining segments yellow. Legs yellow, femora washed with 

 black. Fore wings orange brown with the veins somewhat darker and sometimes indication of a 

 discal mark. Hind wings transparent with the narrow margin and veins orange brown. Fore 

 wings beneath golden yellow, discal mark light yellow. 



Female. — Same as the male but larger. 



Expanse : Male, 26 mm. ; female, 30-36 mm. 



Habitat. — Nevada, California, and Washington. 



Types : One male and three females. Coll. Hy. Edwards, Am. Mus. Nat. Hist. 



Larva. — Same as that of M. tricinctus. 



