METACHROSTis] CARADRINIDAE 139 



shaped marks; spiracular pale, blackish -edged above; head 

 black : on lichens on trees; 10-5. 



37. MoMA, Hb. 



Head rough-scaled ; eyes glabrous. Antennae in (^ciliated. 

 Thorax with slight anterior and posterior crests, patagia some- 

 what crested posteriorly. Abdomen with several crests. 



Restricted to the single species. Larva with tufts of hairs. 



1. M. orion, Esp. 32-37 mm. Thorax pale green marked 

 with black, collar black edged with white. Forewings pale 

 green ; irregular median and submedian streaks and costal 

 edge white ; first and second lines widely remote, thick, irregu- 

 lar, black, second posteriorly irregularly edged with fuscous ; a 

 black mark on middle of costa ; spots partly strongly outlined 

 with black ; black subterminal marks in middle and above 

 tornus ; a terminal row of black anteriorly white-edged spots ; 

 cilia barred. Hindwings light fuscous, darker posteriorly ; two 

 whitish tornal marks. 



Kent to Cornwall, Suffolk, Norfolk, Durham, local ; N. and 

 C. Europe ; 6. Larva brownish-ochreous, with several irregular 

 yellowish lines, dorsally black on 4-12; pale yellow or whitish 

 transverse dorsal blotches on 5, 7, and 10 ; reddish tubercles 

 bearing tufts of brown or whitish hairs; head black, yellowish- 

 marked : on oak, birch, beech, etc. ; 7-9. 



38. ACRONTCTA, 0. 



Head rough - scaled ; eyes glabrous. Antennae in $ very 

 minutely ciliated. Thorax with slight posterior crest. Abdo- 

 men with slight ill-defined hairy crests towards base. 



A rather small genus, characteristic of the European region 

 and N. America. Ova in species 1-8 deposited singly, in 

 remainder in overlapping rows. Larvae remarkably diversified, 

 but usually more or less haiiy, often conspicuously decorated. 

 Pupa in cocoon, or cavity in dead wood, etc.; in species 9-12 

 with segmental margins forming rounded I'idges. 



1. Dorsal half of forewings blackish . 2. alni. 



„ ,, ,, not blackish . .2. 



2. Median band with black subdorsal dash . 3. strigosa. 



,, ,, without such dash . . .3. 



3. Second line marked with white subdorsal spot 9. rumicis. 



,, ,, witliout white spot . . .4. 



4. Forewings partly greenish-tinged . 8. ligustri. 



„ not greenish-tinged . . .5. 



