EXTERNAL ANATOMY OF INSECTS. 361 
a. Vatvuxa (the Valvule). A corneous piece which 
covers the instruments of suction above, represent- 
ing the Labrum in a perfect mouth ?. 
b. Cure. (the Knives). The upper pair of the in- 
struments of suction, which probably make the first 
incision in the food of the insect; they represent 
the Mandibule of the perfect mouth °. 
c. ScaLpELLa (the Lancets). A pair of instruments, 
usually more slender than the Cultelli, which pro- 
bably enter the veins or sap-vessels, and together 
with them form a tube for suction °. 
4, AnTLIA (the Antlia). The oral instrument of Lepz- 
doptera, in which the ordinary Trophi are replaced 
by a spiral, bipartite, tubular machine for suction, 
with its appendages‘. It includes the Solenaria, 
and Fistula. 
A. Sotenaria (the Solenaria). The two lateral subcy- 
lindrical air-tubes of the Anélia®. 
B. Fistuxa (the F%stula). The intermediate subqua- 
drangular pipe, formed by the union of the two 
branches of the Antlia, which conveys the nectar 
to the Pharynx‘. ‘These two branches represent 
the Maville of the perfect mouth.—N.B. M. Sa- 
vigny discovered the rudiments of the remaining 
Trophi in this kind of mouth §. 
5. Rostrutum (the Rostrulum). The oral instrument 
SEcarE VIL, Brc, 5,'6.p'. > Ibid. c’. 
* Ibid. d’. It has not yet been satisfactorily ascertained, whether 
all the ordinary Trophi are represented in every Dipterous mouth, 
the number of the lancets seeming in some cases to vary. 
¢ Prats VI. Fic. 13. © Tbid. a. f Ibid. 4. 
® Ybid. Labrum a’; Mandibule c!; Maxillary Palpus h". 
