S6 THE SCOTTISH NATURALIST 



base. Junction of ist and 2nd segments pale green, apices 

 of the remaining segments dark brown. Spines very few 

 and short. Third segment with four large sensoria placed 

 in a line, 4th segment imbricated, without sensoria, 5th 

 imbricated and with primary sensorium near its apex, 6th 

 segment imbricated and with large sensorium at apex of 

 its basal portion; proportions of segments, 4, 3, 24, 16, 12 

 (5+9). Total length varying from i mm. to 1-3 mm., about 

 I the length of the body. Head much broader than long, 

 front convex, a capitate spine on each side of the median 

 stemmata, and a pair of similar spines placed on each side 

 laterally and posteriorly to the median pair. Eyes dark 

 red. Rostrum reaching to the mid-coxae. Protliorax shorter 

 than the head, with a group of four short spines at each 

 side, and two groups of three near the centre. Wings com- 

 paratively short and narrow, in one specimen just as long 

 as the body, in two specimens shorter than the body ; 

 varying in size from i-2 mm. long by 0-35 mm. broad to 

 1-6 mm. by 0-54 mm. Veins brown, very distinct. Abdomen 

 with seven pairs of large brown spots of irregular, quadri- 

 lateral shape along the dorsum, each bearing from three to 

 five short bristles. These spots increase in size to the fifth 

 pair and thence diminish. On the sides of each of these 

 segments there is a smaller spot of the same colour also 

 bearing several short bristles, and much smaller spots of 

 irregular shape sometimes occur between the rows. On the 

 segment preceding the cauda the dorsal and lateral spots 

 amalgamate to form a dark transverse band bearing several 

 longer capitate bristles. The surface of the dark spots is 

 marked by fine transverse lines and by rows of minute spines 

 only visible under high magnification and absent in the 

 oviparous female. Cauda knobbed, and with several long 

 prominent bristles. Anal plate bilobed and with long spines. 

 Cornicles brown, truncate. Legs brownish green, the base of 

 the femora pale green, the apices of the tibiae and the tarsi 

 brown. Length of hind femur (measured from three speci- 

 mens) 0-29 mm. to 0-32 mm., tibia 0-66 mm. to 0-77 mm., tarsi 

 0-09 mm, to o-i mm. Under-surface of body ochreous. 

 Length varying from 1-3 mm. to i-6 mm. 



