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EXPLANATION OF PLATE II. 
Figures 1-6 belong to the sp. figured in 1726 by Vallisnieri, viz. 
Arge (= Hylotoma) pagana, Pz. (cf. Plates IV, V). 
Fic, 
1. Support. 2. Saw. 3. Apex of support. 4. Apex of saw. 
(Note the lateral comb-like projections, and cf. Fig. 5 !) 
5. The whole excavating organ viewed dorsally. 
6. The whole excavating organ highly magnified and viewed 
laterally—but without pressure ! 
Figures 7-10 are of Réaumur’s sp. figured in 1740, viz. Arge 
rosae, de Geer. (Cf. Plates VI, VII.) 
. Excavating organ viewed dorsally. 8. Saw. 9. Support. 
10, Pencil-like projecting bristles on sides of the support, near its 
inferior margin, and springing from the “costae” which 
strengthen the support. 
~1 
The remaining Figures illustrate various forms of the organ 
in different insects. 
11. Saws and supports of Abia sericea, L., showing their basal 
attachments (hypopygiwm, etc.), flattened out by slight pres- 
sure, 
12. Part of a saw (on left) and support (on right) of T'richiosoma 
tibialis, Leach (the sp. attached to Crataegus /) 
13. Saw of Lophyrus pini, L. (Note the distance between the 
actual upper margin and the sulecate wire-like thickening 
which joins the saw to its support !) 
14. Support of Lophyrus pini. L. (ventral view). (Note the great 
width of the organ at its base in this aspect !) 
15. Supports of Nematus abdominalis, Pz. pressed asunder and 
viewed ventrally. 
16. Saw of Nematus abdominalis, Pz. 
17. Saws of Cladius pectinicornis, Fourcr., showing their basal 
attachments. : 
18. Supports of Cladius pectinicornis, Fourcr. (They are connate, 
practically, at the actual apex.) 
19, Saw and support of Cephus pygmaeus, L. 
20. Apex of “dart” in sting of Apis mellifica, L. (the Hive-bee), 
for comparison with the previous figure. 
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