30 ZYGCENID^ AND BOMBYCID^ 



lately centrally. Sides of the prothorax, orange yellow. Tegulae, 

 largely orange yellow, narrowly and evenly black on the sides out- 

 wardly. Thoracic disc, dark cyaneous. Abdomen, above, bright 

 cyaneous; beneath, black. Legs, black; in the 6, inwardly shaded 

 with obscure whitish, Anterior wings, dull black, with a faint C3'an- 

 eons shade at base, immaculate. Fringes, black, except at apices, 

 where they are prominently white, and are again faintly whitish before 

 anal angle. Secondaries, black, shaded with cyaneous centrally and 

 over internal margin; fringes, black, except at the apices, where they 

 are white. Under surface, resembles upper, but more brownish." 



Grote [loc. cit.] 



Expanse of wings, 1.80 inches. Length of hodv, 0.60 inch. 



Habilal. — California. [Coll. Mus. Berol.; H. Edwards; Stretch.] 



Grote says of this species : " C. Ochroscapus and C. Multifaria differ 

 from C. Virginica, and C. Cressonana in that, the head is slightly 

 narrower behind, while the labial palpi are somewhat shorter and por- 

 rected. These differences do not seem to authorize their generic 

 separation, since in the totality of their remaining characters they 

 agree with the typical species of the genus, wnich they resemble in 

 form, size, and in the style of ornamentation." [Grote. loc. cit.] 



I have seen but three specimens of this species, and these were 

 taken by my friend, Henry Edwards, Esq., at an altitude of about 

 4,500 feet, on the Sierra Nevada Mountains, in the neighborhood of 

 the Yosemite Valley, in July, 1S71. It was found in company with 

 G. Hopfferi, frequenting streams and water courses, and did not 

 appear to be rare, but exceedingly wild and rapid in its flight, and 

 difficult to capture. It alighted frequently on the flowers, but was 

 easily disturbed. These habits are very different to those of its nearest 

 ally, C. Multifaria, and serve to add additional value to the specific 

 characters as here given. These differences of flight, are often of 

 great use in helping us to draw the line of specific differences, and 

 should be more frequently observed than appears to have been the case 

 heretofore. 



6.-CTENUCHA BRUNNEA N. s. 



(3 . $ . — Front, black. Palpi, except the terminal joint which is 

 black, occiput, hind margin of the eyes, and internal margin of the 

 patagia, bright scarlet. Thorax and abdomen, bright metallic blue. 

 Legs, blackish, with the tips of the tibia? whitish. Antennae, long, and 

 deeply pectinated in the male. 



