OETHOPTERA— rORFICULARI^. 213 



T'his species is closely related to L. gilbert!, but may be disting-uished, 

 at least in the male, by the lesser falcation of the forceps. The legs, too, 

 are shorter and smaller, and the joints of the antenna3 less numerous. The 

 sexual difference in the form of the abdomen may be due to the mode of 

 preservation, but is apparently real. 



Florissant. Ten specimens, Nos. 9201, 11172 and 13002, 13549 (c?), 

 5503, 7707, 9442, 9967, 11521 and 13546, 13003, 13548 ($). 



8. Labiduromma lithophilum. 



PI. 16, Fig. 19 ( 9 ). 

 Labidiira lUhophila Scudd., Bull. U. S. Geol. Geogr. Siirv. Terr., II, 259-260 (1876). 



A specimen from Florissant (sent me by A. E. Foote) and figured on 

 the plate was formerly described by me in the following terms: It is a 

 female; the body is much flatter than that of Labidura tertiaria, the abdo- 

 men being equal on a .side view, and the whole surface appears to be 

 minutely punctulate ; the form of the head can not be determined ; the anten- 

 nae approach in length the body [the first joint nearly cylindrical, scarcely 

 eidarging at the tip, about four times as long as broad] ; the comparative or 

 actual length of the succeeding joints can not be determined ; the prothorax 

 has its hinder margin entire and flat ; the tegmina are a little longer than 

 the prothorax, their hinder edge straight and apparently oblique ; the wings 

 appear to liave surpassed the tegmina; the legs are very sliort (especially 

 the femora) and not stout; the abdominal joints are of equal length; the 

 forceps are peculiar, having the appearance of being strongly bowed, 

 although the specimen is a female ; they are very stout at the base, rapidly 

 and regularly diminish in size on the basal half (which is about equal in 

 length to two-thirds the last abdominal joint), beyond wliich they are equal, 

 about half as stout as the base, apparently bent rather strongly inward, and 

 very broadly rounded at the tip, a form of forceps I have never seen in any 

 living earwig. 



Length of body, including forceps, 14.5"""; of antennae, 11""'; prono- 

 tum, 1.85"""; tegmina, 2.5™'"; hind femora, 1.8'"'"; forceps, 2.25™"'. 



I'he portion of the description included above in brackets has since 

 been proved incorrect on closer study, and the whole of the antennae in Fig. 

 19 incorrect. The additional specimens are very imperfect and only serve 

 to show the general resemldance of this species to the others of the series. 



Florissant. Three specimens, Nos. 231, 316, 8837 (cJ). 



