172 ISOTOMA. 



scattered pale spots, and one or two pale lines, along 

 the side. Basal segment of the antennae rather shorter 

 than the other three, which are nearly equal in length. 

 Body covered with short hairs, and some longer setse, 

 especially on the thorax, and the posterior abdominal 

 segments. 



Length, ^ of an inch.!?-) 



Found, during winter and spring, under logs of 

 wood. 



Some specimens, however, are paler, and more 

 reddish-brown, wanting apparently the dark green ; 

 others are more green, from a deficiency of brown. 



The body is about two and a half times as long as 

 the antennae. The mandibles are respectively four 

 and five teeth. The maxillse are short and stout. 



The three feet are similar ; they have no tenent 

 hair ; the large claw has an external tooth, and two 

 small ones on the inner edge. The small claw has a 

 single tooth on the outer margin. 



The saltatory appendage reaches forward as far as 

 the ventral tube. 



Isotoma grisea, Lubbock. 



Isotoma grisea, Lubbock. Trans. Linn. Soc, vol. xxvii. 



Plat^CXXIX. 



Uniform grey ; eyes on a black patch ; hairs short, 

 simple, pale, scattered uniformly over the surface. 

 Third segment of antennae shorter than the second or 

 the fourth. Feet like those of I. anglicana, but the 

 large claw has only a single tooth, no tenent hairs. 

 Terminal segments of spine reaching to the ventral 

 tube, straight, or turned slightly outwards. 



Length, '082 of an inch. 



Under boards, and in similar places. 



Winter and spring. Common. 



I long thought this was the young of some larger 



