454 Prof. R. Newstead on a new Southern Nigerian Psocid. 
22.ix.17. See pp. 418-20 for an account of the habits of 
this and two other species. 
This somewhat remarkable species is nearly allied to 
Psocus kiboschoénsis Knderlein; * but the fore-wings are 
much longer and the structural characters of the pygidium 
of the female, together with the greater number of “ cteni- 
diobothrien ” on the tarsi, readily distinguish it. 
* Der Schwedischen Zool. Exp. Kilimanjaro-Meru; 3B, p. 31, 
taf. 5, figs. 2, 8 (1910). 
EXPLANATION OF PLATE XI. 
Psocus nigeriensis Newst. 2: a, maxillary palpus; 6, maxillary 
process; c, mandible; cl, compound tooth-plate; d, lingua; dl, 
chitinous chord; e, compound spines (ctenidiobothrien); el, tar- 
sus with the ventral compound spines; /, pygidium in profile; 
fl, spine-like processes ; f2, one of the quadrate sclerites ; /3, median 
selerite; /4, the dotted ovate line indicates the position of one of 
the faecal pellets. g, 5: rosette-like platelette and hair on the anal 
lobes. 
