1898.] APPENDAGES IN THE ARTHROPODA. 943 



Scudder (72) seems to have been the first to make experiments 

 on the reproduction ol: the legs. In Diaplieromera he found that 

 amputation at any point below the femoro-trochanteric suture 

 resulted in the reproduction of the lost parts with the tarsus in a 

 4-jointed condition. Bordage's experiments on Alonandroptera 

 inuncans and RhapJiiderus scabrosus show that the reproduced 

 tarsus is invariably 4-jointed in these species. Through the 

 kindness of Dr. David ^harp, I have been able to examine 

 two nymphs of Anchiale, recently obtained in New Britain by 

 Dr. A. Willey. Each of these has one leg reproduced with the 

 tarsus 4-jointed. A third specimen is apparently in the same 

 condition, though the tarsal articulations are not clearly defined. 

 In the two former specimens, as in all the cases which have been 

 figured or described in detail by the several authors above named, 

 the terminal joint of the tarsus (J J resembles the terminal joint 

 of the normal tarsus (J.) and possesses the normal double claw. 

 J, resembles ,;\, and J., and J3 are like the intermediate joints 

 of the normal tarsus. In view of this evidence it seems not 

 improbable that Fortnum (25) overlooked the tarsus in the case of 

 a Diura which he describes as having renewed one of the legs with 

 " all the joints perfect." 



Blattidce. — My own previously published observations that 

 experiment shows that the reproduced legs in this family bear 

 4-jointed tarsi may be added to the evidence from captured 

 specimens collected by Brisout de Barneville (16), quoted in ray 

 previous paper. I have also noticed the 4-jointed tarsus in 

 apparently reproduced legs in Loboptera. Newport mentions a 

 Panesthia with one tarsus apparently in a 3-jointed condition, 

 which was probably an instance like the " crippled " tarsi in 

 Stylopyga described above. 



Hemijitera-Heteropoda. — Douglas (23) has described an extensive 

 series of unilatei'al abnormalities in antennce which he considers 

 were for the most part the results of reproduction after loss of 

 the normal antennae. His cases were collected from more than 

 twenty species belonging to the sections Lygaeina, Coreina, and 

 Scutatoria. The characteristic features of the apparently re- 

 produced antenna? were that, whether the normal number of joints 

 was 4 or 5, the abnormal antenna possessed one joint less than the 

 normal, and that the actual terminal joint resembled the normal 

 terminal one. As a rule these antennae had the intermediate 

 joints of different relative lengths from those of the normal, the 

 most frequent variations being that J.^ was longer than j., and 

 J^ than_/,. But there was a considerable want of uniformity in 

 the conditions observed. In some cases the antennae were 

 apparently of normal structure with the terminal joint wanting, 

 while in others with the normal number of joints he found partial 

 fusions between two joints and abnormally short single joints. 

 On the whole it seems probable that while most of the cases were 

 reproductions having the general features described under (b), 

 some of them were merely instances of injured normal antennae. 



