256 



THE SCOTTISH NATURALIST 



and (c) the hindmost part of the antennal band proper, which 

 as in the male bears a heavy peg-like spine. This portion of 

 the band is in the 9 exceedingly short, with the result that 

 the heavy spine is placed above the insertion of the antenna ; 

 so that the figure formed by the spines is not, as in the £ , a 

 square, but rather trapezoidal. 



The internal transverse bands do not meet in the ? , so 

 that the rounded apex of the signature is distinctly seen. 



First antennal joint rather shorter than the trabecula, and 

 equal to the second ; third and fourth short, fifth longer (see 

 comparative lengths in table). 



Abdomen. — The 1st segment much narrower than the 

 others, with rounded angles. The following segments (2-7) 

 strongly angulated. The 9th segment is fringed with hairs. 



The genital mark covers segments 7 and 8. On the 7th 

 it is entire while on the 8th it is tripartite, the median portion 

 being joined on to the band on segment 7. The two lateral 

 spots have a dark external margin, which seems to cover 

 some internal chitinous structure. 



Legs. — Femora short and broad. Tibiae longer than 

 femora. 



Measurements of Mackayia dimorpha. 



