GENUS JANTHINOSOMA 339 



1. /. Lut.Hi, Theob. Mesonotmii with a broad median band of 



metallic pm-ple, bordered by lateral stripes of brilliant yellow 

 scales. 



b. "With the thorax undecorated. 



fi. With the last two hmd tarsal joints white. 



2. /. discrucians (Walker). Occiput, scutellum and bases of all 



the femora bright yellow. 



y. With the last hind tarsal and apex of next white. 



3. J. musica (Say). Hind femora yellow, fore and middle ones, 



with but little of that coloration, venter with triangular golden 

 apical spots. 



5. With the last hind tarsal joint only all white. 



4. J. posticata (Wied.). With a yellow patch on the tergum of the 



second abdominal segment. 



6. With a white band on the apical half of the fourth hind tarsal 



jomt. 



5. J. Arribdlzagce, sp. n. With only a narrow band of yellow 



coloration on the hind borders of the segments on the venter. 



B. With the hind tarsi entirely black. 



6. J. oblita, Arribdlzaga. The legs lighter coloured than in any 



other species ; pale yellow with testaceous articulations. 



1. JANTHINOSOMA LUTZII, Theobald (Monog. I, p. 257). 

 Plate xiii, fig. 7, Venation of 5 wing. 



Wings unspotted, dusky. Last two joints of hind foot 

 entirely white, but the tarsi otherwise unhanded. Thorax 

 conspicuously adorned by a broad, band of purely deep brown 

 scales, separating large golden-scaled lateral areas. Abdomen deep 

 chocolate-brown, with triangular, lateral bright ferruginous spots, 

 not readily seen when viewed directly from above. Venter with 

 segments deep chocolate at the base and ferruginous on their 

 apical half. 



Head black with a small yellow frontal tuft, and the middle of the 

 vertex and nape bright yellow, but deep brown at each side, behind the 

 eyes. Palpi, ? , very short, deep purple throughout. Those of male very 

 dark ; longer than the proboscis by nearly the whole of their last two 

 joints, which are sub-equal, and together much shorter than the very 

 long third joint. Pleurie and coxae marbled yellowish and white, bases 

 of all the femora ferruginous below, but not perceptible as seen directly 

 from above. There are mmute femoral knee spots to all three pairs of 

 legs, which are of a dark bronzy amethystine tint. Stem of anterior fork 



