tJte Geometrlna of the European, fauna. 85 



genera in which the areole is double are older than 

 corresponding forms with the areole simple, and those 

 with all spurs present are older than those in which they 

 are partly absent. In particular the presence or absence 

 of the median spurs in the ? affords a very reliable test. 



Tabulation of Genera. 



1. Posterior tibife in J with median spurs absent 

 Posterior tibi;B in J with all spurs present . . 



2. Fore wings with 11 connected with 9. . 

 Fore wings with 11 free 



3. Posterior tibite in ^ with terminal spurs 

 Posterior tibi:ie in $ wholly without spurs . . 



1. Antennaj in $ bipectinated 

 Antenucfi in ^ not bipectinated 



5. Antennae in ^ bipectinated . . . . . . 



Antennae in ^ not bipectinated . . . . 



6. Posterior tibiae in ^ wholly without spurs . . 

 Posterior tibire in ^ with at least terminal 



sjiurs . . 



7. Fore wings with areole double . . 

 Fore wings with areole simple . . 



8. Antennfe in ^ bipectinated or dentate-fasci- 



culate ; thorax hairy beneath 

 Antennae in ^ filiform or dentate ; thorax 

 glabrous 



9. Posterior tibii^ in ^ without median spurs . . 

 Posterior tibi,B in ^ with at least one median 



spur . . . . . . . . . . . . 11. 



10. Antennal pectinations short, emitting long 



fascicles of cilia . . . . . . . . 51. Cinglis. 



Antennal pectinations moderately long, normal 54. Leucophthalmia. 



11. Fore wings with areole double . . .. ..56. Ehodosteophia. 



Fore wings with areole simple . . . . 55. Calothysanis. 



45. Cleta, Dup. 



Face rough or with appressed scales. Palpi moderate, porrected, 

 I'ough-scaled or with long rough projecting hairs. Antennae in (^ 

 bipectinated to apex. Thorax hairy beneath or almost glabrous. 

 Femora glabrous or somewhat hairy beneath ; posterior tibiae in 

 (? very short, more or less rough-haired, without spurs, in 5 

 without median spurs ; posterior tarsi in ^ short. Fore wings 

 wiih 10 out of 9, 11 separate. Hind wings with and 7 stalked. 



A development probably of Eois, characterised by the 



