136 
R. S. BAGNALL 
In the above notes I have pointed ont certain very interesting 
and characteristic features, touching slightly upon phylogeny, but, 
though fully recognizing the importance of Urothrips , I think it desirable 
to reserve full consideration of the systematic position of the Thysa- 
noptera, and possible ancestry, hoping that more material may be 
brought to light in the near future, and so help us to come to some 
conclusion on those important questions. 
The Groves, Winlaton-on-Tyne, Co. Durham, 6. III. 1909. 
N. B. — Since sendig this memoir to press I have received from Dr. Pietro 
Buffa, Borne, a paper: Contribuzione alla conoscenza dei Tisanotteri. (Boll, del 
Laboratorio die Zoologia della B. Scuola Superiore d’Agric. in Portici, III, p. 
194 -196, fìg. 1 — 3. Jan. 1909) in which he describes the two new genera Amphi- 
bolothrips and Bebelothrips , both of which, without doubt, are referable to the 
family Urothripidae. Buffa figures the eleventh abdominal segment as possessing 
the minor intermediate hairs and in his prefatory note says : «Questi Tubuliferi 
sono molto interessanti perchè presentano un numero di articoli delle antenne 
minore del solito che è di 8.» I believe that a more critical examination of his 
specimens will further reveal the single-jointed palpi, the widely-separated pos¬ 
terior coxae and the numerous pairs of stigmata — the chief charactere upon which 
I have erected the family, but which are not mentioned by Buffa. Amphibolo- 
thrips closely approaches Urothrips but has the æntennæ four-jointed. 
19. IV. 1909. 
EXPLANATION OF PLATE El. 
Fig. 1. Urothrips paradoxus nov. gen. et n. sp. Ç , X 65. 
s 1—11 = stigmata present in Urothrips ; sx 1 — 4 = stigmata present in 
previously known species of Thysanoptera. 
« 2. Dorsal view of head, and part of prothorax and left fore-coxa ; head partly 
cut open near base to show position of mouth parts ; Ç X 130. 
« . 3, Dorsal reticulation of head ; X 250. 
" 4. Bight antenna ; X 130. 
5. Apical antennal joint showing sense-liairs ; X 400. 
" 6. Second an third antennal joints showing segmentation ; X 250. 
7. Maxillary palpus ; X 400. 
« 8. Labial palpus ; X 400. 
« 9. Left fore-leg, showing coxa, trochanter, femur, tibia and tarsus ; X 130. 
« 10. End of abdomen; X 130. 
a = cliitinous thickening at base of ninth segment in both sexes ; s — stigma. 
« 11. Eleventh abdominal segment in the Ç, showing simple hairs ; X 125. 
•« 12. Eleventh abdominal segment in the cf> showing whiplike hairs ; X 125. 
« 13. Eleventh abdominal segment ; X 250. 
X — specialized dorsal (and ventral) bristle in both sexes. 
