J. E. Hull 177 



furrows) are generally well marked. This is the case in Lophomma 

 herbigradum ; and accordingly in our gynandromorph the right post- 

 ocular furrow is present, quite normal in form and dimensions. But on 

 the left side there is a corresponding longitudinal impression, very slight 

 but still obvious, which of course does not exist in a normal female. This 

 I take to be a merely mechanical effect, and not due to a subordinate 

 male element on the left side. 



The normal female exceeds the male more in breadth of cephalothorax 

 and abdomen than in length, so that there is less displacement of the axis 

 of the body than in Kulczyiiski's Oedothorax (where the difference of the 

 sexes in length is considerable); but the difiference in breadth makes 

 itself visible in carapace, sternum, and abdomen. In the last, the sexes 

 being reversed, the lateral gibbosity is of course on the right side. It 

 will suffice to give illustrative dimensions of the sternum. The greatest 

 width of the left half is 263 /i, of the right 236 /i. 



The legs present no special feature, but I append measurements of 

 the five distal articles — tarsus, metatarsus, tibia, patella, femur — in the 

 order named. As it is the proportiatis that matter, I take no definite 

 unit of measurement but use the length of metatarsus I (= 100) as a 

 standard of reference : 



To these three I must add a fourth of more dubious nature — an 

 example of Oedothorax retusus Westr. taken by Mr W. Falconer on the 

 sandhills near Southport in May 1904, and included by him in the paper 

 on Ahnormality in Spiders already quoted above (see Naturalist, 1910, 

 p. 199). He describes it thus : 



The cephalothorax is raised behind the eyes as in a normal male, but the eleva- 

 tion is much less lofty, not so massive and totally devoid of the lateral impressions 

 which are [noty so conspicuous in the latter, while the descent to the ocular area is 

 also less abrupt. Both palpi are of the male form, but some of their parts, including 

 the palpal organs, are abnormal in shape, size, and structure. In a normal example 

 the tibial joint is shorter than the patella, and provided at the extremity with an 



1 The brackets are mine. The 'not' is obviously a printer's error. 



