Hydrelia. 389 



GENUS XIX. — HYDRELIA (HUBN.). 



Small moths, with white or yellowish wings, with dark transverse lines, which are generally 

 dentated ; hind-wings lii<c the fore-wings in colour and marl<ings, but with fewer transverse 

 lines. The antennae are pectinated in the male of Canibrica, and simple in the other species, 

 and the larvre are without protuberances. 



*i. H. Cainhrica (Curt.). — Fore-wings pale grey, with waved brownish transverse lines, 

 and the last but one in the central area conspicuously dark brown ; nervures 3, 4, and 6 are 

 likewise dark brown in the central area, and intersect the following broader stripe ; the 

 subterminal line is bordered by two waved brownish stripes, and the light band before it is 

 not divided by a dark line ; hind-wings rounded, whitish, with a darker and more simple central 

 line, and the continuation of the subterminal line close to the hind margin ; the latter is marked 

 with dark lunules. Expands from i to i| inches. Inhabits Northern and Alpine Europe and 

 the Altai in June and July. 



*2. H. BloiHcri (Curt.). — Fore-wings bluish-grey, with a broad rusty-brown band below the 

 costa beyond the middle, extending half across the wings, and with a dark central lunule 

 and dark waved transverse lines, the central area lighter, and with fewer markings, and with 

 two sharp teeth projecting below the middle ; hind-wings waved with dusky. Expands about 

 three-quarters of an inch. Inhabits the north of Central Europe in June and July, but is very 

 scarce, except in England. The larva is light greenish-yellow, with a brown band on the back 

 of segments 2 — 4, a reddish-brown band on the sides of segments 7 and 8, and a red mark on 

 the back of segment 12. It feeds on elm in September. 



*3. H. Sylvata (VV. V.). — Fore-wings whitish, with transverse lines dusted with grey, and 

 two rusty-yellow suffused transverse stripes on the sides of the central area, and the light 

 band beyond the last transverse stripe unequally divided, the subterminal line bordered by 

 two dark waved lines ; hind-wings slightly angulated, also with dark transverse lines ; hind 

 margin with dark lunules. Expands from f to i inch. Inhabits Central Europe from 

 May to July. The larva is lilac, green on the sides of the first and last segments, the other 

 segments marked with white spots dotted inside with black, and with white oblique dashes. 

 It feeds on alder in August. 



^4. H. Candidata (W. V.), (^Small White Wave). — White, with many waved brownish-yellow 

 transverse lines and a blackish central dot, which is inconspicuous on the hind-wings ; hind 

 margin finely dotted with black. Expands about three-quarters of an inch. Common in Europe 

 and Armenia in May and June. The larva is pale green, with a red line on the back of the first 

 and last segments, and red spots on the sides of the middle ones. It feeds on beech and 

 hornbeam in August and September. (//. Nyinplailata, Guen., from Andalusia, is much larger 

 (expands over i inch), with six very pale brown lines on the fore-wings and five on the hind- 

 wings, which are parallel and but slightly waved.) 



*5. H. Luteata (W. V.), {Small Yellozu Wave). — Wings ochre-yellow, with dark brown central 

 dots, the fore-wings with six waved ochreous-brown transverse lines, some of which are double, 

 and the hind-wings with three ; all the fringes with a dark spot in the middle, extending to the 

 outermost line. Size of Caiididata. Common in Europe and Northern Asia in May and June. 

 The larva is pale yellowish-brown, with five darker brown longitudinal lines. 



*6. H. Oblitemta (Hufn.), Hcparata (W. V.) — Wings thickly dusted with ochreous-brown, 

 the fore-wings pale ochreous-yellow on the costa, with three straight and often indistinct 



