HVLOICUS PINASTRI. 277 



to iimm., with some variation, as 14mm. to n^mm. The joints 

 are about 63 in number in both sexes; the <? antenna is very slightly 

 thicker, that of the $ is more slender towards the base, giving (very 

 slightly) a clubbed appearance. The hair-pockets of the $ antennae 

 are very completely and regularly developed, each like the next, the 

 same on distal and proximal sides, close up to the ventral carina, &c. 

 Though the rows of scales are exceedingly irregular, the scaling is 

 readily recognised as disposed in three rows to a segment, that on the 

 S being a little the more irregular. The front tibise are of about equal 

 size in the two sexes, but the $ spur is about 2 -2mm. long, that of 

 the 2 only i'8mm.; the comb on the $ spur occupies about 1.2mm. of its 

 length, it is proportionally slightly shorter in the female, viz., o'gmm. 

 The scent-fan of the S arises from a narrow area about o^mm. long, 

 on a narrow chitinous slip, apparently in the centre of the membrane 

 between the dorsal and ventral plates of the 2nd (apparently 1st) ab- 

 dominal segment; really, however, this slip is part of the ventral plate, 

 being connected in front with the anterior corner of the plate. The 

 hairs are about 3'8mm. long and lie in a pocket (when at rest) in 

 this and the following segment. On the following segment, similarly 

 situated, is a long narrow hair-bearing area (i^mm. long), that has 

 all the appearance of being a fan like the primary one, the hairs 

 are, however, comparatively short and differ little from those on 

 the general surface. The marginal batons in this species are in 

 several closely packed rows (Chapman). 



Variation. — There is a very wide range of variation in this 

 species, and the British Museum coll. (thanks to the addition of 

 the " Leech coll." specimens) contains a magnificent series of aberra- 

 tions. The pale greyish-white or hoary form with three blackish 

 longitudinal lineolae is the type, but a magnificent pale specimen, with 

 greyish-white forewings and deep brown characteristic lineolae, and, 

 in addition, a dark median band, divided only in its upper half, and 

 labelled "Leech coll., Berlin,"* is exceedingly fine, whilst a second 

 European example of almost exactly the same form, shows the brown 

 shading of the centre of the forewings even more markedly developed 

 into single banded form (=ab. typica-virgata, n. ab.) ; the aberration in 

 which the dark transverse markings take the form of two dentate 

 transverse lines, and with the three characteristic lineolae absent, forms 

 the ab.fasciata oi Lampa. The more common central European form is 

 of slaty-grey hue, and assumes seven principal aberrations: (1) Uni- 

 formly grey, except for the three typical dark lineolae, and with merely the 

 barest trace of the usual darker shading at the base of the inner margin 

 and on the costa (=ab. asiaticus, Btl.). (2) Uniformly grey, without the 

 dark lineolae or transverse shades ( = ab. grisea, n. ab.). (3) Uniformly 

 grey, without the lineolae, but with the transverse shades ( = ab. grisea- 

 transversa, n. ab.). (4) Uniformly grey, without darker shadings, but with 

 a white median spot ( = ab. grisea-mediopuncta, n. ab.). (5) Uniformly 

 grey, without lineolae and with the transverse shades united practi- 

 cally throughout into a single median brown fascia (=ab. virgata, n. ab.). 



* It may be advisable to note that Leech bought the " Miitzell collection" of 

 lepidoptera, and that the specimens which were found therein are now labelled 

 " Berlin." Although Miitzell lived at Berlin, it is quite possible that many of his 

 insects were not captured in the Berlin district. 



