TRIFIDJi. 47 



elevated ; each segment wrinkled transversely and having a 

 distinct lateral skinfold ; on the back of the second segment 

 is a semicircular corneous plate. Colour of the head wains- 

 cot-brown, reticulated with black at the sides, urabre-brown 

 in front, this latter colour bordered by two parallel lines, one 

 on each side of the median suture. Dorsal surface dull 

 ochreous or ochreous-brown, delicately reticulated with black; 

 on each segment from the iifth to the twelfth is a somewhat 

 diamond-shaped mark, either dull reddish-brown, dull umbre- 

 brown, or bistre-brown ; this is very indistinctly marked on 

 the fifth and sixth segments, and on the twelfth is reduced to 

 a triangle, the apex of which points forward ; through this 

 series of marks passes the slender ochreous dorsal line, edged 

 on each side by a fine dark line ; it is usually obliterated in 

 the centre of each segment, reappearing for a short distance 

 on each side of tlie segmental division ; at the division itself 

 it forms a dark spot only visible when the larva is in motion ; 

 subdorsal lines indistinct, ochreous, interrupted, only visible 

 on the posterior segments ; they are bordered above by a fine 

 brown line, which ends on each segment in a slight curve at 

 the lateral angle of the dorsal diamond ; sometimes the pale 

 lines are altogether absent, and their places only indicated by 

 this fine curved line ; on the eleventh and twelfth segments 

 the place of this fine line is occupied, in each, by a conspic- 

 uous black mark on each side of the dorsal line, on the 

 eleventh as an elongated wedge, on the twelfth larger and 

 more triangular, the apices of the triangles pointing forward, 

 and the bases united by a dark brown line forming the an- 

 terior boundary of a transverse ochreous band across the back 

 of that segment. Lateral surface of the colour of the dorsal 

 diamonds, and. like the back, delicately reticulated with black. 

 Ventral surface and claspers dingy ochreous-grey : legs 

 ochreous-brown ; usual raised dots small, black, each accom- 

 panied by an ochreous spot. 



September to the beginning of May. In the autumn on 

 dock, chickweed, wood spurge, and other low-growing plants ; 



