Species of Argas. 17 



f(i\v!-li(iuse. llie latter api)ear. so far as examined, to be 

 indistiniruisliable from Arc/a-^ persiriix, but the larvae are un- 

 doubtedly similar to those described above as Argas vlc- 

 toriensis, n. sp. There is as yet no proof of any connection 

 between these adults and larvae, althon<ih such may certainly 

 be suspected — and at the earliest opportunity I shall endeavour 

 to hatch out the adults from such larvae in order to test the 

 point. On the other hand, the great difference in the chelicerae 

 and hypostome from those descril)ed for the larvae of Arga& 

 persicus, points to the validity of this new species. Under the 

 circumstances the following table seems desirable, showing 

 individual width and length, and the character of the hypos- 

 tome : — 



Width Lenjfth 



1. — 1.1 mm. - .9H mm. Tips of chelicerae only, visible dorsally. 



2. — 1.3 mm. - 1.3 mm. Tip of hypostome visible dorsally. 



3. — l.G mm. - 1.6 mm. Hypostome and chelicerae not visible dorsally 

 4. — 1.1 mm. - .96 mm. ,, ,, ,, ,, „ „ 



5. — 1.5 mm. - 1.76 mm. Tip of hyjiostome visible dorsally. 



6. — - .96 mm. - .96 mm. Hypostome and chelicerae not visible dorsally 

 7. — 1.2 mm. - 1.2 mm. „ ,, ,, „ „ „ 



8.— 1.05 mm. - 1.01 mm. 

 9.— 1.32 mm. - 1.36 mm. 



10. — 1. mm. - .89 mm. Tijj of hypostome visible dorsally. 



11. — 1. mm. - .93 mm. Extreme tip of hypostome visible dorsally. 



Nos. 5 to 11 are those referred to in this addendum. 

 BiHLIOGRAPHY. 



Nuttall, Warburton, Cooper and Robinson, 1908. 



" Monograph of the Ixodoidea, Pt. I., Argasidae." 

 Salmon and Stiles, 1901, U.S. Dept. of Agriculture. 



Seventeenth Annual Re])ort. Bureau Animal Industry. 



EXPLANATION OF PLATE IL 



Fig. 1. — Argas victoriensis, n. sp. — Larva — dorsal view, x 20. 

 Two posterior legs on left-hand side somewhat distorted 

 in appearance through fore-shortening. The tips of the 

 chelicerae oulv are seen at the anterior border. 



