lythria] HYDRIOMENIDAE 233 



fulvous ; costa sometimes mixed with purple ; two purple or 

 crimson fasciae, variable in width, first curved, not reaching 

 dorsum, second straight, sometimes furcate on costa, sometimes 

 not I'eaching dorsum ; cilia purple or crimson. Hindwings 

 deep orange : base and dorsum suffused with fulvous or olive- 

 brownish ; cilia of termen purple. 



York, two specimens many years ago, probably not a 

 resident ; Europe, WC. Asia to Turkestan ; 6. Larva slender, 

 dull green or brown-reddish, beneath pale green, division well- 

 marked ; dorsal line darker : on Rvmex and Polygonum ; 8. 



2. STERRHIDAE. 



Face smooth. Tongue developed. Palpi shortly rough- 

 scaled. Forewings : 10 rising out of 9, 11 anastomosing or 

 connected with 9. Hindwings : 5 fully developed, rising from 

 middle of transverse vein, parallel to 4, 8 very shortly anas- 

 tomosing with upper margin of cell near base, thence rapidly 

 diverging. 



Though not as numerous as the preceding, this is still a very 

 considerable family, pretty evenly distributed throughout the 

 world except in New Zealand, where there is only one hai'dly 

 native species. Imago usually of rather small size, body 

 slender, forewings rather broad -triangular ; posterior tibiae of 

 J often enlarged and enclosing an expansible tuft of hairs. 



Ovum oblong -oval, surface reticulated. Larva elongate, 

 slender, with few hairs, without prolegs on 7-9. Pupa usually 

 in a very slight cocoon above ground. 



The phylogeny of the few British genera is almost suffi- 

 ciently indicated by their linear arrangement. 



Tabulation of Genera. 



L Posterior tibiae in 9 with middle-spurs absent . 2. 

 ,, ,, ,, middle-spurs present . 3. 



2. Posterior tibiae in c? with end-spurs . 2. Sterrha. 



,, ,, ,, wholly without spurs 1. Eois. 



3. Posterior tibiae in S wholly without spurs 3. Leptomerls. 



,, ,, ,, with at least end-spurs . 4. 



4. Posterior tibiae in ^ with middle-spurs 



6. Calothysanis. 

 „ ,, ,, without middle-spurs . 5. 



5. Antennae in S pectinated . 5. Leucophthalmia. 



,, ,, ciliated . . .4. Pylarge. 



