474 WALTER E. COLLINGE. 



of L. natalensis of 7—9 mm. in length I note that this latter 

 species has only 12-15 joints in the flagellum. 



In young L. oceanic a {Linn.) of from 7-9 mm. in length 

 both the antennae and uropoda are proportionally shorter than 

 in the adult and there are always fewer joints in the flagellum 

 of the anteiina3. 



The original description of gracilipes is as follows : 



" Speciei prsecedenti afhnis, forma et habitu simillima. 



" Antennas extei'iores gracilliinaB, corpus longitudine quarta 

 parti superantes. Flagellum 22-articulatum ; articuli longiores. 



" Pedes caudales anales perlongi, corpora paulo longiores. 



" Long. 7-9 mm. 



" Patria : Africa meridionalis ; e ' Laudana ' exampla pauca 

 in Museo Simon asservantur.'^ 



1. Ligia natalensis 71. .§];. PI. XXYIII, figs. 9-18. 



Body (fig. 9) elongated, more than twice as long as it is 

 broad, moderately convex and slightly granulated ; metasome 

 abruptly contracted. Cephalon (figs. 10, 11) semi-oval from 

 above with posterior transverse groove ; epistome with three 

 prominent transverse ridges, the ventral one with two small 

 upwardly directed spines. Eyes large and convex. Anten- 

 nulse (fig. 12) small, first two joints subequal, third joint 

 nodiform. Antennae (fig. 13) slender and elongated, first 

 three joints small, 4th and 5th elongated, flagellum consisting 

 of 21 joints and short terminal style. First maxilla (fig. 14) 

 small, outer lobe with six stout, elongated, pointed spines 

 and four inner ones varyingly denticulate, inner lobe with 

 three elongated, setose, terminal spines, and prominent 

 setaceous knob. Segments of the mesosome sub-equal, 1st 

 to 3rd with pleural plates truncate terminally, 4th some- 

 what similar, but with posterior angles pointed, terminal 

 portion of 5th to 7th curved backward and terminating in 

 sharp point. Appendages (figs. 15 and 16) comparatively 

 small and fragile, gradually enlarging from before back- 

 Avards. Uropoda (fig. 17) elongated and slightly curved 



