Hybrids of Sphingidae. By Dr. P. Den so. 263 



A. liyl)r. carelica Denso (Aniorphu poindi jjopuli L. (^ or 9 >' Amorpha rwivrensis nmurenms Stgr. $ or J), carelica. 

 Only one .specimen known, captured at large. Expanse 79 mm. Shape of wings as in populi, dentition of the 

 margins less prominent. The markings of the upperside diffuse (similarly as in amurensis). The ground-colour 

 of the forewing brown, grey towards the base; the grey stripe which runs from the costal to the hind margin 

 is nearly quite straight as in amurensis, not being undulate as in populi. The hindwing has the same brown 

 ground-colour as the forewing and bears a red-brown basal patch, which is much smaller than in populi and 

 essentially larger than the minute traces of the spot which are very rarely met with in amurensis. The under- 

 side as in amurensis; there are no distinct markings, but at the apex and hind angle only some diffuse small 

 spots which are paler than the ground. 



B. Crosses between Races. 



1. Between Smerinlhus ocellata ocellata L. and Sineriidhus uceUula atlanticus Aust. 



S. f. (hybr.) charlotta Dannenberg (Smerinthus ocellata atlanticus Aust. o X Smerinthus ocellata ocellata ihitrlniid. 

 L. ?). In facies nearer to atlanticus, which it also approaches in size. General colouration of the forewing a dull 

 yellowish grey. The grey colour of the costal nuirgin of the hindwing rather pale, all the red tones somewhat 

 duller than in ocellata. The markings of the forewing stronger than in atlanticus, but more diffuse than in ocel- 

 lata. The ocellus large and broad, margined with black. The thoracical patch halfway between those of oce//a/a 

 and atlanticus. Obtained in captivity. 



S. f. (hybr.) gertrudis Dannenberg (Smerinthus ocellata ocellata L. <S X Smerinthus ocellata atlanticus iierlnulis. 

 Aust. 9). Approaches atlanticus like charlotta, but less closely. Markings stronger than in charlotta, costal mar- 

 gin of the hindwing darker, the red tone stronger. Forewing more pointed. Underside of wings darker than in 

 charlotta. Expanse larger in gertrudis. Obtained in captivity. Specimens obtained from pupae kept cool and 

 hibernating are, both in this hybrid and charlotta, especially large and dark. 



2. Between Amorpha populi austauti Stgr. and Amorpha populi populi L. 



(All obtained only in captivity.) 

 A. f. (hybr.) darwiniana Standf. (Amorpha populi austauti Stgr. <S X Amorpha populi populi L. ?). daririniana. 



A. f. (hybr.) langi Standf. (Amorpha populi populi L. (^ X Amorpha populi austauti Stgr. $). Both laniji. 

 crosses combine the characteristics of their parents, both however incline towards populi. Above all they have 

 retained the great variability oi populi in the general tint of colouration. The moderately deep indentations 

 of the distal margins of the wmgs and the large size are inlierited from austauti. 



A. f. (hybr.) densoi Standf. (Amorpha populi populi L. $ X Amorpha populi f. (hybr.) darwiniana f/c».so(. 

 Standf.). Extreniely variable. Distal margins of wings varying from being feebly undulate to being sharply 

 dentate. Markings sharply defined or diffuse. Ground-colour light grey to dark grey. Shape of wings usually 

 approaching that of popitH. Generative organs reduced to a greater or lesser extent. Expaiise: cJ 73 to 92 mm, 

 9 82 to 96 mm. 



A. f. (hybr.) populiformis Standf. (Amorpha populi populi L. ,S X Amorpha populi f. (hybr.) langi popuU- 

 Standf. ?). The specimens which emerge before hibernation are different from those which leave the chrysalis /<"■""■'''• 

 after hibernation. The former have no teeth to the distal margins and feebly developed markings, the ground- 

 colour about midway between that of light grey populi and yellowish whitish grey austauti gen. aest. 

 staudingeri. The specimens appearing after hibernation of tlie pupa approach populi in the stronger dentition 

 of the distal margins, sharper markings and the usually slaty grey ground-colour. Generative organs sometimes 

 strongly atrophied. Expanse: (J 74 to 85 mm, $ 81 to 90 mm. 



A. f. (hybr.) austautio'ides Standf. (Amorpha populi austauti Stgr. <S X Amorpha populi f. (hybr.) ausiauti- 

 darwiniana Standf. ?). Dentition of distal margins of wings feeble, but nxore distinct than in austauti. The "'-'''"'■ 

 markings strongly reduced in extent and but feebly expressed. The ground-colour exceedingly variable, the 

 light grey to reddish tones of the summer-brood staudingeri of austauti and its f. mirabilis, as well as the 

 dark grey and dark reddish tints of populi occurring. On the whole this cross much approaches the forms 

 of austauti. Generative glands atrophied. Expanse: cj 85 to 87 mm, ? 86 to 107 mm. 



A. f. (hybr.) roepkei Standf. (Amorpha populi f. (hybr.) langi Standf. <? X Amorpha populi i. (hybr.) rocijicei. 

 langi Standf. ?). Strongly reduced. Distal margins usually obviously dentate. Markings feebly expressed. 

 Ground-colour usually grey, sometimes reddish. Generative glands anomalous to deformed. Expanse: <S 76 

 to 79 mm, ? 77 to 87 mm. 



A. f. (hybr.) turatii Standf. (Amorpha populi f. (hybr.) da.runniana Standf. S x Amorpha liopuli f. tHmlii. 

 (hybr.) darwiniana Standf. $). Extremely variable. Distal margins feebly undulate to excessively sharply 

 dentate, sometimes produced into sharp points; markings always weakly developed, particularly so in the 



