L. Harrison 25 
Tetrophthalmus. ' Grosse, Zeit.J. wiss. ZooL, xlii, 1885, p. 534. Type, 
T. chilensis Grosse. 
Thricodedes, Bezzi, Eev. Ital. Sci. Nat., xiii, 1893, p. 97, = Tri- 
chodectes. 
Trabeculus. Rudow, Zeit. /. do ges. Nat., xxvii, 1866, p. 466. 
Type, T. schillingi Rudow. 
Trichodectes. Mtzsch, Germar's Magazin, iii, 1818, p. 294. Type, 
T. canis Degeer. 
Trichophilopterus. Stobbe, Ent. Rundschau, xxx, 1913, p. 105. Type, 
T. babakotophilus Stobbe. 
Trimenopon. Cummings, Bull. Ent. Research, iv, 1913, p. 39. 
Type, T. jenningsi Kellogg and Paine. 
Trinotion. Perry, Proc. Lit. Phil. Soc. Liverpool, xxx, 1876, 
p. Ixxx, for Trinoton Nitzsch. 
Trinoton. Nitzsch, Germar's Magazin, iii, 1818, p. 300. Type, 
T. conspurcatum Nitzsch. 
Trinotum. Burmeister, Handbuch der Entomologie, ii, 1838, 
p. 440, emendation of Trinoton Nitzsch. 
Trochiloecetes. Paine and Mann, Psyche, xx, 1913, p. 21. Type, 
T. prominens Kellogg and Chapman. 
IV. 
Scheme of Classification. 
The classification adopted must be looked upon as provisional. 
My unpublished work convinces me of the very close relationship 
between the biting and sucking lice, which has already been fore- 
shadowed by Borner, Cholodkowsky, Eulmek and others, so I reduce 
the Mallophaga to the level of a Sub-order, retaining the names of 
Kellogg's sub-orders for the two super-families into which the group is 
clearly differentiated. The Amblycera I divide into six equivalent 
families, Boopidae, Trimenoponidae, Gyropidae, Menoponidae, Laemo- 
bothriidae, and Ricinidae; the Ischnocera into three, Trichodectidae, 
Nesiotinidae and Philopteridae, the last of which I again divide into 
a number of sub-families. As long as many genera still enclose a vast 
number of heterogeneous forms, it is not possible to make a satisfactory 
classification. But I have for the present left the large genera alone, 
preferring to make this list a basis for future revisional work rather 
than to impair its value by an attempt at revision now, I have rejected 
altogether three genera, M6nacanthus Neumann, Oxylipeurus Mjoberg, 
and Pseudonirmus Mjoberg. The first of these comprises a hetero- 
geneous assemblage, and, though it may be possible at a later date to 
