114 HALF-AN-HOUR 



Plate XXVIH. 



Fig. 1. — Represents the female, Pediculus capitis. 

 ,, 2. — The male of the same, in which it will be observed the limbs 



are both relatively and actually larger than in the female ; 



the anterior pair are especially long and strong. 

 J, 3. — Parts of the mouth when not in use ; a tube is seen capable 



of eversion, with certain backward-pointing hooks. 

 ,, 4. — Part of the mouth everted. 

 ,, 5. — Pediculus vestimenti, after Denny. 

 ,, 6. — Anterior leg, P. capitis, ^ 

 ,, 7. — Posterior leg of the same. 

 ,, 8. — Antenna of same. 

 ,, 9. — Ditto, P. vestimenti. 

 ,, 10. — Posterior leg of the same, $ 

 ,, 11. — Anterior les of ditto. 



Plate XXIX. 



Fig. 1. — Bihio marci, as seen with a low power; the small figures, 1 — 

 13, point to the segments composing the body. 

 ,, 2. — Trophi : at., antenna; mx.p., maxillary palp ; Ih., labium. 

 ^^ 3. — Spiracle of the sixth abdominal segment on the left side. 

 4. — Foot of limb of the second pair, on the left side. 



5. — Illustrates a dissection of the parts of the mouth in a Gad-fly 

 "Stout": Ihr., labrum ; md., md., mandibles; mx., mx., 

 maxillse ; mxp. , mxp. , maxillary palpi ; Ing. , lingua (tongue) ; 

 lb., labium. 



Plate XXX. — Upper Half. 

 Structural details of Aphis (? sp.) from Cineraria, f 

 Fig. 1.— Eye. 

 ,, 2. — " Trophi" (parts of the mouth) : Ih. is the labium, or under 

 lip ; it is formed of four joints, marked respectively 1, 2, 3, 4, 

 and has at its termination a couple of tactile hairs, marked 

 vh. (vibrissfe) ; a deep, narrow channel is seen in its length, 

 in which the rostrum, rst., is lodged ; Ihr. indicates the 

 labrum, or upper lip. The rostrum is composed of four setae. 



,, 3. — Represents the rostrum from another preparation, partly in 

 diagram. The two internal set?e are united, and appear to me 

 to be modified max'dlce — mx. , or inner jaws ; the mandibles, 

 md., play up and down in lateral grooves of the maxillue. 



