Sesta. 77 



pectinations in the males. The hind tibise are thickly covered with dense hair, and the abdomen is 

 thick, with a short tuft at the extremity in the males only. The larvae live two years, and the 

 moths appear in June and July. 



* 1. T. Apiformis (Linn.), {Hornet Clearwing). — Dark brown; the head, palpi, two spots in 

 front of the thorax and the base of the two first segments of the abdomen and the three last 

 yellow; wings transparent; the nerx'ures and the costa of the fore-wings rust-colour; hind margins 

 darker. In the variety Sirecifonnis (Esp.) the last segments are brown. Expands about \\ inches. 

 Common throughout the greater part of Europe and Northern and Western Asia, resting on the 

 trunks of poplars near the roots in the daytime. The larva is whitish-yellow, with a darker line 

 on the back, and a blackish head. It lives in the roots and in the lower part of the trunks of 

 poplars. The moth is figured at PI. 20, Fig. 6. 



*2. T. Crahronifonnis (Lew.), Beiiibccifonnis (Hiibn.). — More slender than the last species; the 

 thorax unicolorous dark brown, with a yellow collar ; the streak at the end of the discoidal cell of 

 the fore-wings much narrower. The larva lives in the stems of the sallow. A very scarce and 

 local insect in Central Europe, though not uncommon in England. The moth is figured at 

 PL 20, Fig. 7. 



3. T. Melanocephala (Dalm.). — Body bluish-black, collar and sides of the thorax bordered 

 with yellow, abdomen with narrow yellow rings ; wings transparent, fore-wings rust-colour on the 

 costa, and dusted with dark grey; antennae of the male pectinated. Expands about \\ inches. 

 A very scarce and local species, confined to Sweden and some parts of North-Eastern Germany. 

 The larva is to be found in the trunk and branches of the aspen on which it feeds. 



GENUS IT. — SCIAPTERON (STAUD.). 



Characters of Scsia, but the antennas of the male are furnished with long, slender lamelljE, like 

 the teeth of a comb, and the whole surface of the fore-wings is opaque and densely scaled, onl}' 

 showing faint traces of transparency towards the base. 



* \. S. Tabauiforinis (Rott.), Asiliformis (W. V.). — Body bluish-black, abdomen in the male 

 with four and in the female with three j'ellow rings. Besides these there is a narrow ring behind 

 the head, a spot on the front of the thorax, and a dot at the base of the fore-wings yellow ; the eye- 

 caps are silvery-white in front. The fore-wings are brown, slightly transparent towards the base, 

 and the hind-wings are transparent, with brown borders. The perfect insect appears in June and 

 July, and the larva may be found in the branches and roots of the black poplar and aspen in 

 April. The southern variety Rliiiigiaformis (Hiibn.) has the antennae and fore-wings dusted 

 with ochre-yellow, the segments of the abdomen are all belted with yellow, and the front of 

 the eye-caps is also yellow. The larva lives on .sallow. Expands from \\ to \\ inches. Appears 

 to be distributed very generally throughout Europe {RhiugicBformis in South Europe and Western 

 Asia), but is common in some localities and very rare in others. Although formcrlj- taken in the 

 neighbourhood of London, it has lately become exceedingly rare in England. 



GENUS III. — SESIA (FABR.). 



Body slender; the abdomen with red, white, or yellow belts, and tufted at the extremity in 

 both sexes. Fore-wings with twelve nervures, with the margins densely scaled, and a denseh'- 

 scaled transverse band bej'ond the middle, so that there are three transparent spaces — one in the 

 discoidal cell, one above the inner margin, and a round spot divided by the dark nervures between 



