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Show 904 MR. H. H. BRINDLEY ON THE REGENEUATION [Nov. 30, The femur very frequently, and the tibia always, have a conspicuous armature of spines. The tarsus in all the Blattidse is five-jointed. The proximal joint is the longest and stoutest, the next much smaller, and tbe succeeding two very much smaller, while the distal joint approaches the proximal in length and bears a pair of claws. Between the claws many species have a thin rounded projection, the arolium. In other Orthoptera the number of tarsal joints is 3 in Forfi-culidse, Hernimeridse, and Acridiidse, 2 or 3 in Gryllidae, 4 in Locusticke, and 5 in Mantidae and Phasmida3'. The occasional occurrence among Blattida? of tarsi possessing only four joints, but in other respects normal, has been noted by entomologists from time to time. In the last century Geoffroy 2 specially characterized the genus Bluttu as having four joints in the tarsi of the posterior pair of legs and five in those of the other pairs, though, in spite of this statement, he figures both sexes with five-jointed tarsi on all the legs. His description was doubtless based on one or two abnormal individuals. This error was corrected by Serville \ who does not allude, however, to the occasional occurrence of abnormal tarsi. A few years later Brisout de Barneville 4 called attention to the occasional presence of four-jointed tarsi in several species of Blattidae. H e gives the following table, in which, as elsewhere in this paper, I have followed the nomenclature of Brunner D:- Nyctibora latipennis .jY sericea Kpilampra cinerea Leucopkcea surinamensis ... Monuchoda grossa Paucsthia javanica Total number of individuals examined. 1 11 10 3 11 51 10 1 14 Number of individuals with one or more of the tarsi four-jointed. 1 5 2 2 1 10 1 1 4 1 Brunner von Wattenwyl, ' Prodr. Europ. Orthop.' 1882. ' Hist, abregee des Insectes,' 1764, i. p. 379. 3 Hist. nat. des Insectes, 1839, p. 58. 4 Ann. de la Soc. Entom. 1848, ser. 2, vi. Bulletin, p. xix. 5 'Nouveau Systeme des Blattaires,' Vienne, 1865, and "Revision du Systemo des Orthopteres," Ann. Mus. Genova, 1893, ser. 2, xiii. |