1896.] Entomology. 593 
The further question arises, why should an epipharynx be pushed to 
one side and completely shaped to the structures there ? 
I have suggested that the pair of slender parts, called by Uzel and 
others mandibles, may be lobes of the maxille, and urged in explana- 
tion that they are attached to parts regarded by everybody as maxillz, 
and besides that they are composed of two divisions (Professor Com- 
stock does not represent the basal piece at all and hence the slender 
distal part appears in his figures as if free from the maxilla). Uzel 
figures this pair of mouth organs, as I have done, attached to the 
bases of the palpus-bearing parts, and as composed of a short basal 
piece and a long slender distal one. He says nothing of their jointed 
character but represents an articulation in the right one of his figure 
161. They appear to me to be two-jointed and with this true, to con- 
sider them mandibles is to assume a departure from the one-jointed 
condition of the mandible prevailing in Hexapoda. 
_ In the proceedings of the Entomological Club of the American As- 
sociation (Can. Ent., Vol. XXII, p. 216), I am reported as stating that 
two unmistakable teria claws are present in Pleothrips and that the 
vesicle is probably a modified pulvillus. Prof. Comstock says: “ The 
tarsi are two-jointed, bladder-like at the tip, and without claws.” 
Uzel, on the contrary, states that claws are more or less developed in 
all Thysanoptera. “ Beine Kurz; der eine-bis zweigliedrige Tarsus 
am Ende mit zwei mehr oder wenlger deutlichen Klanen, welche an 
Blase anwachsen.” 
Prof. Comstock’s work has been quoted simply because it represents 
the established American view of the structure of Thysanoptera, a 
view which must certainly be changed in some particulars. To what 
extent the asymmetry referred to has been studied by foreign ento- 
mologists I am unable to say, since I have not been so situated as to 
be able to keep close track of the foreign literature. Thus far I have 
seen no reference to it except that in Uzel’s work. 
EXPLANATION OF THF FIGURE. 
Front view of head of Aeolothrips fasciata. A, the unsymmetrical 
labrum; B, the unpaired mouth-part (mandible, according to my in- 
terpretion, epipharynx according to Uzel) ; C, lobe of maxilla (man- 
dible of Uzel and other authors); D, the maxilla; E, the maxillary 
palpus ; F, the labial palpus—H. GARMAN. 
-A New African Diplopod Related to Polyxenus.—While 
collecting insects in the darker parts of the Liberian forests, I have on 
41 
