210 TERTIARY INSECTS OF NORTH AMERICA. 



mina, and in the specimen examined are partially opened on the right side, 

 so as to show incompletely the peculiar rayed arrangement of the nervnles. 

 The legs are short, the femora broadest in the middle, the tibia? moderately 



O mj 



slender and slightly bowed ; but the tarsal joints are too obscure to deter- 

 mine their structure ; the faintness of the legs probably shows that they 

 were paler than the body, which is of a griseous brown. The joints of the 

 abdomen can readily be distinguished, although a portion of some of them 

 are injured, and especially of the third segment; this renders it impossible 

 to decide certainly whether plications were present on this segment, but 

 there are no signs of any either on this or on the better-preserved second 

 segment; it would seem as if such plications should be seen, if present, at 

 least on the second segment, for the abdomen is preserved on a partial side 

 view, and the portion of the second segment where plications are to be looked 

 for is perfectly preserved. The abdomen appears to have been equal as 

 viewed from above, although the greater fullness in depth of the middle 

 joints gives the specimen a great height in the middle ; the last segment is 

 large, scarcely narrowing, and furnished with a pair of stout, straight, 

 tapering, bluntly-pointed forceps as viewed from the side, not so long as 

 the tegmina, and apparently curved inward at the tip. The insect is slightly 

 smaller than the common Labidura riparia (Pall.) Dohrn. 



Length of body, excluding forceps, 17 mm ; of head, 2.2 mm ; breadth of 

 same, 1.75 mm ; length of pronotum, 1.9"""; breadth of same, 2 mm ; length of 

 tegmina, 3.G niin ; extent of folded wings beyond tegmina, 2.o mm ; length of 

 hind femora, 2.75 mm ; of hind tibiae, 1.75"""; of forceps, 2.5 " im . 



Since the above description was published I have seen and studied four 

 or five more specimens, serving to modify and extend the characters before 

 given, as follows : The head is fully as broad as and not narrower than the 

 pronotum. The antenna? reach back to the posterior margin of the closed 

 tegmina, and their joints are cylindrical and about four times as long as 

 broad. The pygidium is rounded subtriangular and moderately large. 

 The forceps of the male are very simple, being straight, with parallel 

 sides at the very base (as far as the tip of pygidium), then narrowing 

 rather rapidly on the inner side only, the blunt apex incurved. Of the fe- 

 males all the specimens are imperfect, but in the one figured the forceps 

 appear to be laminate, tapering, entirely simple, and not incurved at the tip; 

 the apical parts, however, are exceedingly obscure and may be wrongly 



