58 DIPLOPODA. 
This species was based upon a single female specimen. Subsequent examination 
proved it to possess the characters of the genus Paraiulus, and provoked the remark 
that it might be referred to the same species as P. olmecus. ‘The uncertainty in this 
verdict leaves both specific names in an unsettled state, and it is a matter for regret 
that with the type-specimens available for comparison, no definite conclusion was 
arrived at. If the two forms are the same, the name farascus, having nine years’ 
priority, must supersede ol/mecus. 
6. Paraiulus filicornis. 
Julus filicornis, Sauss. Mém. Soc. Phys. Genéve, xv. p. 377, t. 5. figg. 388, 38 a—-d (1860) , 
? Julus filicornis, Humb. et Sauss. Miss. Sci. Mex., Myr. p. 92 (1872) °. 
Hab. Mexico, Vera Cruz! 2, Cuernavaca ?. 
It must be regarded as doubtful whether the specimens from Cuernavaca are 
specifically the same as the type from Vera Cruz. 
From the description it appears that this species, whether one or more is of no 
great moment, was based upon an immature (Pseudoiulus) stage of Paraiulus. 
In the case of the Cuernavaca examples the size, form, and coloration are said to be 
the same as in P. olmecus, and the statement that the first legs of the male are shorter 
and thicker than the others excludes the species from Judus and places it in the same 
category as the immature form of Paraiulus. Moreover, since in other particulars the 
immature male of the latter genus does not appreciably differ from Julus, and since 
the immature female resembles Judus in all respects, no further justification need be 
- sought for the assumption stated above. 
The only structural character mentioned which sharply differentiates the Cuernavaca 
specimens from the types of P. olmecus, P. amulensis, P. aztecus, and P. stylifer is the 
position of the pores in front of the sulcus. 
The description of the type from Vera Cruz enumerates no features opposed to the 
view that the specimen was an immature Paraiulus. 
Number of segments in Vera Cruz specimens 47, length 28 millim.; number of 
segments in Cuernavaca specimens 43-44, length 20-23 millim. 
7. Paraiulus rasilis. 
Julus rasilis, Karsch, Zeitschr, ges. Naturwiss. (3) vi. p. 17 (1881) ’. 
Hab. Mexico, Puebla !. 
It is not possible by the description to differentiate this species from any of the 
foregoing. The statements that the segments are longitudinally sulcate up to the 
pores, which are situated behind the complete transverse sulcus, and that the caudal 
process is straight, subacute, and surpasses the anal valves, coupled with what is said 
‘yegarding the appendages of the anterior somites, forcibly suggest that the types were 
immature males and female of some species of Paraiulus. Number of segments 48. 
Length 27 millim. 
