23O SMITHSONIAN MISCELLANEOUS COLLECTIONS [VOL. 50 



This species is close to Mcsarmadillo quadrimaculatus Budde- 

 Lund, 1 but differs in color and the position of the four spots. The 

 spots are described as being on the second and seventh thoracic 

 segments in M. quadrimaculatus, while in the present species thev 

 are placed on the third and seventh segments. According to the 

 figure of the uropoda and the sixth abdominal segment of M. 

 quadrimaculatus, 2 the present species also differs in the length of 

 the apical process of the sixth segment, being much shorter than 

 that of M. quadrimaculatus, and in the shape and length of the 

 basal article of the uropoda, which in M. quadrimaculutus is as 

 long as the apical process of the sixth abdominal segment, is much 

 longer than wide, and has the posterior margin truncate, while in 

 the present species the basal article of the uropoda does not reach 

 the apical process of the sixth abdominal segment, is not longer 

 than wide, and has a deep excavation in the posterior margin, on 

 either side of which the post-lateral angles are produced. 



MESARMADILLO VARIEGATUS, sp. nov. 



Body ovate, contractile into a ball. Surface smooth, punctate. 

 Color, light and dark brown, mottled with yellow spots in no defi- 

 nite arrangement and in no constant relation, so that the body ap- 

 pears quite variegated. 



Head much wider than long, 2 J / 2 mm. : 8 mm. Frontal margin 

 straight and continuous with the epistome, which is flat. Front not 

 margined. Eyes large, composite, situated at the lateral margins. 

 First pair of antennae small, inconspicuous. Second pair with the 

 first article short ; second article about twice as long as the first ; 

 third article about as long as the second ; fourth article about one 

 and a half times as long as the third ; fifth article about one and a 

 half times as long as the fourth. Flagellum composed of three 

 nearly subequal articles. 



The first segment of the thorax is twice as long as any of those 

 following, which are subequal. It is 6 mm. in length, and each of 

 the following segments is 3 mm. long. The coxopodites of the 

 first segment are wide, flat plates not much thickened, separated 

 by a shallow groove from the segment, and not reaching to the 

 post-lateral angles of the segments. They are cleft posteriori}-, 

 the inner portion being smaller than the exterior portion, and the 



1 A Revision of "Crustacea Isopoda Terrestria," pt. 1, Eubelum, 1899, pp. 



14-15. 

 -Ibid., Tab. m, fig. 15. 



