74 ZYG^NID^ AND BOMBYCID^ 



The tabulation of the species of this genus is a most difficult task. 

 The following attempt will, however, be some assistance in limiting the 

 researches of the student : 

 a. Primaries dark. 



b. Nervules clothed with pale scales. 



c. Secondaries crimson - Vifgo, Sautidersu, Achaia, $, . 



cc. " black ------ Anna. 



ccc. " yellow. 



f Transverse bands on primaries - Persephone, Achaia $,. 



Var. Ochracea. 

 f No transverse band on primaries - - Virguncida. 



car. Secondaries reddish ochre or brick red - Dahurica, 



Achaia $ , Edwardsii, Coinplicata. 

 ccccc. Secondaries cinereous - - Speciossima, Quetiselii. 

 b. Nervules concolorous with the rest of wing. 



c. Thorax black, - - -' - Behrii Nevadensis. 



cc. ' ' striped. 



d. Primaries with longitudinal stripes only. 



* Secondaries red or reddish - Nais, var. ; Nais, var. deco7-ata. 



* Secondaries buff ------ Nais. 



dd. Primaries with longitudinal and transverse stripes, mark- 

 ings narrow. 



* Secondaries red - - Williamsii, Bolanderi, figurala. 



* " yellow and brown - - figurala, vzx. celia. 

 ddd. Primaries with longitudinal and transverse stripes, mark- 

 ings broad, giving the wings an angular-spotted appear- 

 ance. 



* Secondaries red or I'eddish - auiholea $ , Blakei. 



* ' ' white - - . - auiholea 5 . 



* " cinereous - - - . - gdida. 

 A. Primaries pale _ . - . arge, placeniia, pallida. 



l.-ARCTIA AUTHOLEA. (Pi 3, fig. 3 <5 , 4 ? .) 



Chelonia auiholea, Boisd. , Lep. Cal., p. 76. (1868-9.) 

 5 . — Very pale yellowish white. Head and prothorax pale yellowish. 

 Patagia and thorax of the same color, with a broad black stripe down 

 the centre of each. Abdomen rosy red, with the last segment, and a 

 dorsal row of small spots black. 



