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differ scarcely or only slightly from the same parts in the adults, 
and it will therefore often be possible to refer such stages to their 
species. 
This family has in all probability an almost world-wide di¬ 
stribution. In Europe it has been found at least from the Southern 
third of Sweden to Calabria, in America from Massachusetts to 
Paraguay, Chile and Argentina, and it is common in Siam. 
I refer all my twenty three species to two genera. The genus 
Pciuropus contains twenty one, but I have not subdivided it further, 
as many species must be discovered and studied before the charac- 
teis of generic value can be pointed out with tolerable certainty. 
Conspectus of the Genera. 
The lower antennal branch has the anterior margin considerably 
longer than the posterior; its anterior flagellum is longer than the 
other, and the stalk of the globulus is considerably longer than the 
transverse diameter of the globulus itself. The sternum of the 
anal segment has only the posterior pair of setæ. 
I. Stglopauropus Cook. 
The lovver antennal branch has the anterior margin shorter 
than the posterior; its anterior flagellum is shorter than the poste¬ 
rior, and the stalk of the globulus is never longer, almost always 
considerably to very much shorter than the transverse diameter of 
the globulus. The sternum of the anal segment with two or three 
pairs of setæ. II. Pauropus Lubb. 
I. Stylopauropus Cook, 1896. 
Diagnosis. The lower antennal branch has the anterior mar¬ 
gin considerably longer than the posterior; its anterior flagellum 
is longer than the other, and the transverse diameter of the glo¬ 
bulus is considerably shorter than its stalk. The penultimate seg¬ 
ment of the trunk with six pairs of dorsal setæ, three of which 
between the tactile setæ. The sternum of the anal segment has 
only the posterior pair of setæ. 
