ARMADILLO VOLGA RIS. 493 



Armadillidium wdgare. MILNE EDWARDS, Crust, iii. p. 184. BUR- 



GERSDIJK, Annot. p. 51. ZADDACH, Syn. 



Crust. Pruss. p. 19. JOHJTSSON, Syn. 



Framst. Sver. Onisc. p. 34. 

 Armadillium vulgare. KINAHAN, Nat. Hist. Rev. vol. iv. 1857, 



p. 276, pi. xxi. figs. 3, 913. 



Oniscus cinereus. ZENKER, in Panzer, Heft. 62. n. 22. 



(Var.) Armadillo variegatm. LATREILLE, Gen. Cr. et Ins. i. p. 72, n. 2. 



KOCH, Cont. Panzer, Heft. 178 n. 15, 



and 186, n. 2. 

 Armadillidium Zenkeri, BRANDT, Consp. Mon. Crust. Onisc. Bull. 



Mosc. vi. 185. 



(Var.) Armadillo opacus. KOCH, Cont. Panz. Heft. 180, n. 3. 



(Var.) Armadillo Willii. KOCH, Cont. Panz. Heft. 186, n. 1. 



Armadillo pulchellus. SCHNITZLER, Onisc. Bonn. p. 26 (?). 



THIS very widely dispersed species is subject to great 

 variation in the amount of its pale markings, which has 

 led to the establishment of a great number of supposed 

 species, as appears from the citations quoted above. 

 We have not been able to recognize more than a single 

 species amongst them, which is well distinguished by the 

 perfectly globular form in which it is able to roll itself 

 up when alarmed, as represented in the lower left-hand 

 figure of the accompanying wood-cut. The extremity 

 of the tail and of the flattened truncated appendages of 

 the last caudal segment exactly coincides with the front 

 margin of the head, completely concealing the deflexed 

 antennas and legs. 



The head is produced on each side immediately below 

 the eye into a short transverse ridge, forming the upper 

 edge of a groove, within which the basal joints of the 

 antennae are lodged; the lower edge of the groove 

 being also produced into a moderately prominent 

 rounded lobe. The labrum or upper lip is triangular, 

 and transversely prominent along its straight upper edge. 

 The inner antennae are very minute and apparently 

 three-jointed, the middle joint being the smallest, but 



