280 Annals Entomological Society of America [Vol. XIII, 



greater power of resistance to prolonged submersion in fresh 

 as well as in sea-water than other chilopods, such as scolo- 

 pendrids, as has been experimentally demonstrated by Plateau.* 

 After examining only the male of this form from the Ber- 

 mudas, I was inclined to consider it as distinct from the 

 European species; but further study of a female in comparison 

 with one from Banyuls-sur-Mer, France, kindly sent to me by 

 Dr. Brolemann, shows the Bermudan and European forms to be 

 undoubtedly identical. The male and female from the Ber- 

 mudas have respectively forty-seven and forty-nine pairs of 

 legs, the numbers most frequent in European specimens, and 

 measure 32 and 20 mm. in length. They are yellow, excepting 

 the end regions which are ferruginous. Structurally they 

 agree in general with the exhaustive description given by 

 Brolemann and Ribaut (0pp. cit.). In this description no 

 mention is made of definite chitinous pockets in a few of the 

 anterior plates; but the specimens agree in showing these. The 

 Bermudan male, cleared and mounted, shows pronounced and 

 strongly chitinized infoldings, or pockets, in the anterior edges 

 of the ninth to thirteenth sternites, with a much shallower one 

 on the eighth and fourteenth. The prebasal plate in the male 

 is covered; but this is probably due to shrinkage in the alcohol, 

 as it is exposed in the normal manner in the female. 



LITHOBIID.E. 



Lithobius provocator Pccock. 



Ann. and Mag. Nat. Hist., 1891, ser. 6, 8, p. 152. 



Lithobius provocator Pocock, ibid., 1893, 11, p. 122. 



Lithobius bermudensis Pocock, ibid., 1893, 11, p. 126. 



Lithobius provocator Chamberlin, Proc. Acad. Sci. Phil., 1904, p. 653. 



Color varying from light to deep brown, often showing a median 

 longitudinal pale stripe, and the head with first and last one or two plates 

 commonly more reddish, chestnut to mahogany. Prosternum and 

 prehensors brown, the latter rufous distall3^ Antennas brown to 

 mahogany, mostly nearly uniform. Posterior legs concolorous with 

 dorsum, uniform or with last one or two articles paler. 



Head subcordate, widest at or a little in front of marginal breaks. 

 A little wider than long (25 x 24). Hairs short and few. Punctas weak 

 and scattered. Antennae with articles thirty-seven to fift^^-eight in 

 number, forty-six being frequent; reaching seventh or eighth segment. 



* Les Myriopodes marins et la Resistance des Arthropodes a respiration 

 aerieen a la submersion, Jour, de I'Anat. et Physiol, 1890, 26, p. 236-269. 



