THE EUROPEAN ORC.YIAS. 



201 



this group is to that of o. i/ouD^itiipna tlian to (>. aiimliwhata ; the 

 latter species is, in fact, in antenn,T and almost all other matters of 

 structure, much more detfenerate than (>. cncar. It is only in the 

 cocoon that we find O. ericae (at least <>. intcrwi'iHa) to have gone 

 further than (>. aumlimhata. The (>. anrnliiiih(ita cocoon was only a 

 passing phase in (>. erirat', whilst (>. axndiiiihata adhered to it and 

 degenerated further. The wings are longer in (>. ericae than in 

 <). aiiynliinhata, and, though the legs of (>. ericae are much smaller 

 than those of O. f/dnnat if/ma, and have especially small femora, the 

 tibiae and tarsi are much better developed than those of (K aiiroUwhata. 



Measurements (in jiii-limetres) of vabious structdees of Females of species of 



OuvciiA. 



Antennffi. 



jAntiqua. 



Gonos- 

 tigma. 



lent^'th 

 joints 



1st leg j tibia 



, , I tarsus 



2nd leg ..... tibia 



,, .... tarsus 



3rd leg ; tibia 



,, tarsus 



Forewing . . length 

 Hindwing . . ,, 



Ovipositor . . , length of 1st 

 rods 



, , . . length of 2nd 



rods 



Eggs i high 



,, I wide 



2'Onnn, 



25 

 (some 

 anchy- 

 losed) 

 l'4mm, 



1-2 



1-6 



1-3 

 2-3 



1-6 

 1-8 

 0-4 



0-75 



0-90 



•75 



•85 



Anceps ? 



■ 0'4mm. 



0^3 



0^4 

 nil 



1^00 

 1-33 



Inter- 

 media. 



Ericae. | media 



(another) 



'"**•'" (Tri^ote- '''"^•^t® I 



j (another) 



phras. 



Antennse . . < length 



,, . . no. of joints 



1st leg ; tibia 



, , tarsus 



2nd leg .... j til)ia 

 ,, . . . . ! tarsus 



3rd leg tibia 



,, tarsus 



Forewing . . length 

 Hindwing .. ,, 



Ovipositor . . 1st rod, 8th 

 segment 

 2nd rod, 9th 

 segment 



Eggs high 



,, wide 



l-65mm.i 1^6mm. \ l-2nim. l^lmm. l*Omm. 



I 17 



0^84mm. 



0-75 



1-20 



0-9 



1-2 



0^82 



1^5 



9 



0^93 



19 



0-84mm. 



0^92 



0-92 



0-92 



1-j 



1-1 



1^2 

 I ' 

 1 0-6 



0-9 



0-77 

 0^95 



0-3 

 •75 



1-05 



18 

 0-66 

 0^78 

 0-90 

 0-90 

 l-Ory 

 1-00 

 1^3 

 0^55 



0-7.J 

 1^0 



18 

 0^75 

 11 

 1^05 



0-75 

 102 



1-1 



In the latter, also, they are completely anchylosed, whilst in 0. ericae 



