185 
Lahiduridac, a family of the Dermwptera.. 
2. Forcipis braccliia ^ parte laminata 
parallela, apice rectaiigula, species 
indica.3. nepalensis. Burr. 
2.2. Forcipis bracchia parte laminata 
in dentem valde aentnm pro- 
ducta, species africana .... 4. Jigini% Burr. 
Faralabidura lividipes, Duf., is a widely distributed and 
familiar species; the development and armature of the 
forceps vary considerably, as would be expected, and 
consequently there are several synonymous names. 
P. tenuicornis, Bonn., is a larger, but allied, species from 
Sumatra. 
P. nepalensis, Burr, has laminate forceps; it is only 
known from Nepal, and is figured in a recent work (Burr, 
I910h fig. 30). 
P. fginii. Burr (1908^-, p. 176), also has laminate 
forceps: it is based on a pair from Eritrea, in the Genoa 
Museum. It is interesting to note that it has a strong 
resemblance to some undescribed species preserved in 
Baltic amber of Oligocene age. 
Genus 2 .—Labidura, Leach. 
This genus now includes only L. hengalensis, Dohrn, 
and the polymorphic L. riparia, with its numerous forms, 
mutations, varieties, races, sub-species, or even species, 
according to the individual opinion of every author. The 
synonymy is consequently very involved, and it is diffi¬ 
cult to assign the correct name to the various forms. 
Kirby (1908) has given a useful preliminary arrange¬ 
ment; he separates the apterous Neotropical race into a 
distinct genus, Demogorgon, and is followed by Borelli, but 
I can hardly agree with either. Personally I cannot 
allow more than specific rank to these large, pale, apterous 
forms, and not even that with a feeling of real conviction. 
I can only say that certain well-marked geographical 
races stand out, as pluvialis, Kirby, from New Guinea ; 
truneata, Kirby, from Australia; a small apterous form 
from India, that I have provisionally identified with “ var., 
inermis" of Brunner, and xanthopus, Stal, from South 
America; hengalensis, Dohrn, from Bengal, is of no higher 
rank. 
