268 SELECTED NOTES FROM 



Fig. 5. — Sheath of Wasp-Stiiig, evidently homologous at the posterior 

 end of the body with the mandibles (I) at the anterior, the 

 Btings representing the serrate pair of organs (maxilhe, ?). 



,, 6. — Diagrammatic section of the latter : s., sheath ; st., stings. 



,, 7. — A dissection, giving a natural view of the parts connected 

 with a Wasp's Sting : d. , duct for bringing the poison from 

 its secreting gland to pr. , a large, sub-pyriform organ, 

 covered with spirally-arranged and interlacing voluntary 

 muscles ; hence it is carried hj p.d., the excretory duct, to 

 the base of the sheath of sting ; sh. , sheath ; st. , lancets, 

 which are moved backwards and forwards in grooves in the 

 latter by mm. , powerful muscles, longitudinal and trans- 

 verse ; it. , end of intestine ; ap. ap. , anal palpi. 



Drawn by Tuffen West. 



Plate XXI. 



-Weevil of Pine-trees {Hylobius ahietis), slightly enlarged. 



-Dissection from same, showing head, namely : — Ihr., labrum ; 

 711(1., mandible ; s.cd., situation of antenna; or., eye ; os. , 

 oesophagus ; pr. , proventriculus (gizzard) ; bk. bk. , portions 

 of back. 



-Diagrammatic section of Gizzard of a Weevil, seen from above. 



-Figure of Gizzard taken from slide, showing the eight double 

 lines of scale-like teeth, bent at a right angle at about half 

 their length, horny, deep-brown in their free portions ; of a 

 pale transparent yellow at the j^art attached to the walls of 

 the gizzard. 



,, 5. — Some of the teeth from another specimen, showing the den- 

 tations at their " free extremities, and the strite on the 

 expanded portion. , - 



,, 6. — Represents a Gizzard removed from its attachments, and 

 looked into from above, one of the six teeth is seen to be 

 much larger than the remaining five, and to represent an 

 anvil on which the others play. 



,, 7. — Another Gizzard, cut open, showing the six teeth and ten- 

 dinous attachments for the powerful muscles which move the 

 organ, t.m.a. and m.m. The portion of intestine leading on 

 to the stomach proper is seen at the lower part of the figure ; 

 it is of a funnel shape, and guarded by six ciliated valves, v.v. 



,, 8. — In which these valves are better shown, it having been taken 

 from a recent dissection, Figs. (3 and 7 being from dried spe- 

 cimens, in which the parts are somewhat shrivelled and 

 obscure. 



DraAvn by Tufien W^est. 



,, 9. — Adysia dytlsci, represented as seen unprepared, x 20. 



,, 10. — The same, more enlarged, and prepared by pressure and 

 washing. 



,, 11, — Palpi of same. Drawn by T. Ball, 



