228 SMITHSONIAN MISCELLANEOUS COLLECTIONS [V0t. 50 



the terminal segment, as compared with the uropoda, in the shape and 

 length of the coxopodites of the first thoracic segment, in the an- 

 tennae, the fifth article of the peduncle in M. marginatus being much 

 longer as compared with the previous article than in the present 

 species and in the absence of the pearl-like granulation on each side 

 of the thoracic segments, characteristic of M. marginatus. 



MESARMADILLO QUADRICOLORATUS, sp. nov. 



Body convex, contractile into a ball. Surface smooth, but with 

 a small, pearliform granulation on either side of each one of the tho- 

 racic segments. Color, dark brown, with wavy lines of yellow on 

 either side of the median line. There is a large spot on either side of 

 the third thoracic segment on the lateral portion of the segment. On 

 the seventh thoracic segment is a similar yellow spot, one on either 

 side, close to the lateral margin. The basal article of the uropoda 

 and the coxopodites of the first thoracic segment are also yellow, 

 and in some of the specimens there are yellow spots in the median 

 longitudinal line of the thorax. 



Head wider than long, 3 mm. : 7 mm., with the frontal margin 

 slightly rounded in the middle. Front not margined, but con- 

 tinuous with the epistome, which is slightly convex in the middle. 

 The eyes are small, composite, and situated at the lateral margin. 

 The first pair of antennae are minute and inconspicuous. The sec- 

 ond pair have the first article short ; the second article is twice as long 

 as the first; the third is as long as the second; the fourth is one 

 and a half times longer than the third ; the fifth is but little longer 

 than the fourth. The flagellum is composed of three subequal 

 articles. 



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

 those following, which are subequal. The first segment is 5 mm. 

 in length. The second segment is 3 mm. long. The coxopodites 

 form a rather wide lateral border on either side, wider anteriorly 

 than posteriorly and not extending the entire length of the segment 

 on the dorsal side, but almost to the post-lateral angles on the ven- 

 tral side. The coxopodites are cleft posteriorly, the inner portion 

 being smaller than the exterior portion. Coxopodites are also pres- 

 ent on the anterior portion of the second and third segments in the 

 form of a thickened ridge. 



The first five segments of the abdomen are about subequal, the 

 lateral parts of the first two being covered by the seventh thoracic 

 segment. The lateral parts of the third, fourth, and fifth segments 

 are well developed and directed backward. Those of the fifth seg- 



