642 PATAGONIAN EXPEDITIONS I ZOOLOGY. 



Pendola of the museum in Buenos Aires, I possess sketches of the caudal 

 flap of Berg's species, which show that it is only very slightly longer than 

 broad. 



4. There seems to be more of a ferrugineous color on the lower side 

 of the body in L. patagonicus. 



5. The size of L. patagonicus is smaller, body 30-35 mm., and includ- 

 ing cercopoda, 43-46 mm., while our species, without cercopoda, reaches 

 46 mm. 



Berg describes a male, while our specimens are females, but I hardly 

 believe that the above differences are due to sex, since it is characteristic 

 in this family that $ and 9 hardly differ, except for the smaller size of 

 the J 1 , and the larger caudal flap of the tf. While the first character 

 would apply to this case, the second does not, the caudal flap being much 

 larger in our 9- On the other hand, the longer abdomen in the J 1 would 

 agree with the same condition found in the J 1 of L. bilobatus. 



For the rest, our species resembles L. angasi Baird (1866, p. 122, pi. 

 12, f. i) from South Australia (Adelaide). Here the general form of the 

 body and the characters of the various parts are almost identical, and I 

 find only the following differences : 



1. L. angasi is much smaller (i inch = 25 mm.). 



2. The body is of horn-color instead of green. 



3. The spinules of the abdomen are curved downward in L. angasi, 

 while they are straight in our species. 



In all other respects, both species are closely allied, especially the fol- 

 lowing important characters agree : 



1. Number of exposed abdominal segments : 12 in L. angasi (accord- 

 ing to figure), 10 in our species. 



2. Eyes of the same size and shape (according to figure of L. angasi}. 



3. Keel of scutum, and fine dentations on posterior part of lateral 

 margins similar in both. 



4. Cervical furrows identical (according to figure of L. angasi}. 



5. Caudal flap absolutely identical in form, but it seems that the margins 

 are denticulated all around in L. angasi. 



The apparently close affinity of our species with the South Australian 

 L. angasi demands an investigation of the relationship of it with the other 

 known species of the genus, and we may state the following : 



i. L. glacialis (Kr.) (see Simon, 1886). Arctic regions. 



