fcl'TklCHA QUERClFOLiA. 203 



of Macrothylacia rubi or Cosmotriche potatoria is represented by a 

 very short baton about one-fourth the length of the bristles and not 

 twice its thickness in length. There is, however, an important 

 primitive character shown, for, instead of the dorsa of the plumules 

 being naked, as is the rule in Lachneids, and as is the case also 

 in this species in the lower set and the further of the upper 

 (or shorter set), the dorsa of 24 joints, at least, nearest the base 

 of the antenna, carry very long dark scales. The scales are pointed 

 at their attachments, to which they narrow very regularly from their 

 not very broad apices, being thus long narrow triangles. They 

 are most abundant at the ends of the plumules, and are but 

 one row towards their base, and appear to be rather fugitive, 

 so that some are obviously missing how many being doubtful. 

 2 . About 58 segments, length 9mm. — 10mm. The character 

 of the pectination approaches that of the $ much more than 

 in most Lachneids. The longer pectinations are about i*3mm., 

 the shorter about o^mm. in length. The upper ones are 

 shorter throughout, but not markedly for the distal half of the 

 antennae. The short plumules carry scales as in the $ . The 

 hairs of the plumules are much shorter and fewer than in the $ , 

 but very similarly disposed. The short terminal batons are about 

 half the length of the accompanying bristles. 



Gynandromorphism. — The following are the records we are 

 able to find of gynandromorphous examples of this species : 



a. £ left, ? right. Body on right side with ? , left side with $ genitalia. 

 Wings of S side smaller. Antennae equal in length, the $ thicker. Body from 

 above to beneath divided by a sharp line. Head strikingly oblique ; £ side more 

 arched, the eyes larger. Abdomen on the ? side more extended, thinner haired, 

 with more perceptible segments ; $ side more slender, somewhat bent in, more 

 strongly haired, with anal hairs. Middle line with erect hairs on the shai ply-marked 

 suture. On the anus some points visible as "rod " (Rute), on each side thereof a 

 small, rounded, brown, corneous plate as in the $ . Hind margin broadly truncated 

 as in the <? . Internally on the ? side a twisted :< egg-bag" with 18 normal eggs ; 

 on the $ side 2 testicles connected by a passage. Bred. In the Berlin Museum. — 

 Klug, Verh., p. 368 ; Klug, Jahrb., p. 235 ; Burm., p. 340 ; Rudolphi, p. 55. 



/3. Left side £ , right ? . Size of the wings diffei-s greatly. Left side <$ . 

 In form the wings agree with both sexes ; the colour is uniform, but the ? side has 

 sharply marked bands. Antennas equal in length, that of the £ thicker. Abdomen 

 "with the left side thin and more slender than the right, which is stout and swollen. 

 Terminal end crooked towards the left side. Bred in Offenbach. In AViskott coll. 

 Breslau (Wiskott, Festschr. Schles. Ver. Ins., 1897, p. 120). 



y. An apparent ? , containing eggs, but with one $ antenna (Dorfmeister, 

 Mitt. Steiermark, iv., p. 70). 



Variation. — The variation ot this species is comparatively 

 great ; in colour the British examples vary from a delicate ochreous, 

 with a distinct rosy tinge, to a deep purple, with intermediate forms 

 of ochreous-red, red-brown, and reddish-purple. Besides these, some 

 examples are very richly tinged with a grey bloom, whilst other 

 examples are entirely greyish in tone, and these are usually rather 

 poorly scaled. Knaggs records a curiously pale specimen almost 

 albino. James notes that of 20 bred from Waldringfield, the 2 s varied 

 considerably, one being of quite a greyish tint, another with the 

 colour of the male, whilst two or three others are more or less suffused 

 with the same coloration. Chapman notes that in Constant's 

 collection the specimens labelled alnifolia, from central France, are 

 much darker than usual, and the purple bloom is so pronounced 



