MB. W. r. KTRBY OK EOKriCULID^. 503 



extremely important for their classification, being almost always 

 more or less broken. In many cases tbe sexes difEer consider- 

 ably, especially in tbe sbape of the forceps. This usually varies 

 considerably in the sexes, as well as in different individuals of 

 the same sex, and yet there seems reason to believe that it will 

 ultimately prove to be an important generic character. But for 

 this purpose much larger series of specimens of both sexes and 

 in different stages of development are required ; and therefore I 

 have refrained for the present from creating a multiplicity of 

 new genera, though the mass of species included by Dohrn in 

 Forjicula is greatly in need of subdivision. 



I consider the best method of measuring these insects to be 

 from the point of the head to the end of the forceps, and also 

 from the base of the last dorsal segment to the end of the forceps. 



The number of species at present known is 348, including 39 

 described as new in the present paper, but exclusive of one or 

 two doubtful larval (?) forms, perhaps not strictly belonging to 

 the Eorficulidse {Gondylopalama, Sund., and TypTilolahia, Scudd., 

 the latter of which probably = lapyx (Thysanurd) . 



The genus Pyragra, Serv., which is imperfectly known at 

 present, is likewise excluded from the Table. It is a South- 

 American genus, probably allied to Lahidura, and may be dis- 

 tinguished from Demogorgon by the presence of well-developed 

 wings. (A few species, doubtfully referred to various genera in 

 the following pages, may not always fully conform to the cha- 

 racters given in the Table.) 



G-enus I. Apachtus, Serv. 

 Serv. Ann. Sci. Nat. xxii. p. 35 (1831). 



Apachya, Serv. Orth. p. 54 (1839) ; Dohm, Stett. ent. Zeit. 

 xxiv. p. 42 (1863). 



Type, Forficula depressa, Beauv., from "W. Africa. 

 Not represented in the Museum Collection. 



G-enus II. Tagalina, Dohrn. 

 Dolirn, Stett. ent. Zeit. xxiv. p. 44 (1863). 



Type, T. grandiventris, Blanch., from the Solomon Islands. 



There is one immature and imperfect specimen from Dinner 

 Island, in the Museum Collection ; probably a new species, but 

 it would be useless to describe it. 



