NO. 4 FEEDING MECHANISM OF LEPIDOPTERA SCHMITT 



27 



great length of the hypostoma in Lepidoptera elevates the tentorium 

 to a higher position in the head, with respect to other cephalic struc- 

 tures, than is common. 



6. The antennal muscles arise on the anterior arms of the tentorium 

 and vary in number from one to five pairs. They are always well 

 developed, sometimes at the expense of other head structures and, in 

 moths with obsolete feeding structures, are often the only functional 

 muscles within the head. 



ABBREVIATIONS USED ON THE FIGURES 



Ant, antenna. 

 ant mcl, antennal muscle. 

 Ant Nv, antennal nerve. 

 ^7?, antennal ridge. 

 AT, anterior tentorial arms. 

 at, invagination of anterior arm. 

 atp, anterior tentorial proboscis ex- 

 tensor. 

 BuC, buccal cavity. 

 Br, brain. 

 Cd, cardo. 

 Clp, clypeus. 



cp, cranial proboscis extensor. 

 Cv, cervix. 



dlhc, dilator of buccal cavity. 

 dlcb, dilator of cibarium. 

 dplp, depressor of palpus. 

 dlphy, dilator of pharynx. 

 E, eye. 



fm, food meatus. 

 Fr, frons. 



Fr Con, frontal connective. 

 Fr Gng, frontal ganglion. 

 HBr, hypostoma! bridge. 

 Hphy, hypopharynx. 

 HphyR, hypopharyngeal ridge. 

 HR, hypostomal ridge. 

 hs, hypostomal suture. 

 Hst, hypostoma. 

 Lb, labium. 

 Lb Pip, labial palpus. 

 Iplp, levator of palpus. 

 Ipm, lateral pump muscle. 

 Lrm, labrum. 

 MP, median plate. 

 Mth, mouth. 



Nv, nerve. 

 Oc, occiput. 

 OcR, occipital ridge. 

 ocs, occipital suture. 

 Oe, oesophagus. 

 OVm, oral valve muscle. 

 PBm, proboscis base muscles. 

 PC, pressure chamber. 

 Phy, pharynx. 

 Plf, pilifer. 

 Pip, palpus. 

 Poc, postocciput. 

 PoR, postoccipital ridge. 

 pos, postoccipital suture. 

 Prb, proboscis. 

 Prb Ext, proboscis extensor. 

 Prtl, parietal. 



PT, posterior tentorial arms. 

 pt, invaginations of posterior arms. 

 ptp, posterior tentorial proboscis ex- 

 tensor. 

 rao, retractor of mouth angles. 

 rhphy, retractor of hypopharynx. 

 rn(RNv), recurrent nerve. 

 IS, anterior salivarium muscle. 

 2s, 3s, posterior salivarium muscle. 

 SID, salivary duct. 

 Slv, salivarium. 

 sin, salivary meatus. 

 Soc Gng, suboesophageal ganglion. 

 SP, sucking pump. 

 SR, stipital ridge. 

 St, stipes. 



tpm, transverse pump muscle. 

 Tr, trachea. 

 vlv, valve. 



