3. ANTHRAX 529 



shining, and with much more numerous golden scales than in the male ; face 

 with very few black hairs on the eyemargins. Eyes slightly smaller. 



Thorax and scutellum almost as in the male, but the black scales less 

 abundant and the silvery patch at the base of the wing quite absent. 



Abdomen black, mainly dull ; the longer pubescence exactly as in the male 

 except that the pale tufts at the tip are pale yellow rather than silvery, and 

 the pubescence on the disc is much less abundant and consequently the 

 ground colour less obscured ; a conspicuous band of golden scales occurs on 

 each of the second, third, and fourth segments, of which the one against (but 

 not on) the front margin of the second segment is the broadest and occupies 

 slightly more than one-third of the segment, and the one on the front margin 

 of the third segment is the narrowest, but the band on the front margin of 

 the fourth segment is almost as wide as the one on the second segment ; these 

 two bands are narrowest at the middle and widen a little towards the sides, 

 while all three bands merge into the long tawny or yellow side pubescence ; the 

 hindmargin of the sixth segnient bears an inconspicuous narrow not dense 

 band of golden scales, and the hindmargin of the fifth segment may have a 

 very inconspicuous and still narrower band ; the seventh segment forms 

 a short triangle not half so wide as the sixth segment, and has black 

 scales on the disc, and some yellow scales and long yellow hairs about 

 its basal corners besides conspicuous black pubescence. Belly with 

 numerous conspicuous white scales on the fourth, fifth, and sixth segments, 

 covering all the fourth segment and the hindmargins widely of the fifth and 

 sixth segments, but the seventh segment with less conspicuous more scattered 

 scales ; the three basal segments have less conspicuous yellowish scaled hind- 

 margins, and also numerous less conspicuous yellow hairs, and on the seventh 

 segment are fairly numerous longer black hairs ; but at first glance the belly 

 appears to have a black fascia across the fifth and sixth segments which 

 is extended at its middle to the tip of the abdomen ; ovipositor orange. 



Legs with the pale scales on the inside of the hind tibia? more regularly 

 numerous and conspicuous, and the black scales less splayed out. 



Wings as in the male, but the dilated base of the costa with more 

 numerous tawny scales except on the front part. Squama? and hal teres 

 as in the male. 



Length about 12 mm., but varying from 10 mm. to 14 mm. 



This species varies but very little. Occasionally a specimen of either 

 sex may reach 14 mm. in length, but usually the size is very regular ; in 

 these large specimens the silvery patch at the base of the wing has a 

 tendency to become obscure, and the pale scales against the hindmargin 

 of the eyes to be less silvery. One female has conspicuous pale hairs 

 beneath the basal joint of the antennae, and one taken by Colonel 

 Yerbury at Barmouth on September 4, 1902, has the pubescence on 

 the sides and back part of thorax more tawny (like the fur collar), and 

 has a small prsealar spine at the base of the costa, and the whole margin 

 of the dilated costal base more spinose ; a female taken at Sidmouth by 

 Mr Fred. Smith in August, 1871, has the prsealar spine distinct and the 

 costal base as spinose as in the Barmouth specimen just mentioned; and a 

 large female also taken by Mr Fred. Smith at (probably) Southend in 1870 

 has the pubescence on the pleurae rich tawny, and the middle of the face 

 unusually black haired. An immature female taken at Barton Mills on 

 July 9, 1901, has white scales all over the third to sixth segments of the 

 belly, but at present I have seen no other female from that locality ; other 

 very fresh females have unusually numerous tawny scales on the fifth 

 and sixth dorsal abdominal segments. 



Some closely allied species occur in Britain, of which I now recognise 

 A. circumdatus and A. cing^datus, both of which have obvious bands on the 

 abdomen in both sexes ; both are also rather smaller, and A. circumdatus 



2 L 



