178 PROCEEDINGS ENTOMOLOGICAL SOCIETY 



Many questions readily arise in the mind concerning these 

 organs or their parts. The answer to such however must be re- 

 served until more extensive and more minute studies have been 

 completed. Above all things what seems to be of no little sig- 

 nificance is that, so far, we have found a striking conformity of 

 type within the genus and at the same time most widely diver- 

 fent forms within the same family. 



The writer is greatly indebted to both Dr. .Boving and Mr. 

 Heinrich for many valuable suggestions and especially to the 

 latter for material for study. 



EXPLANATION OF PLATES. 



PLATE XVII. 



Fig. 1. Lagoa crispata Pack. 



Fig. 2. Coleopohora veroniceella Chambers. 



Fig. 3. Gracilaria sp. 

 PLATE XVIII. 



Fig. 4. Acrocercops strigifinitella Clemens. 



Fig. 5. Ectoedemia heinrichi Busck. 



Fig. 6. Sesiid larva. 



Hx = : Hypopharynx; L = Fleshy lobes; B = Blades; Am = Arms of 

 mentum. 

 PLATE XIX. Telea polyphemus, Cramer. Anatomy of lower lip. 



Fig. 7. Side view of labium and hypopharynx. 



A -- Mental-zygomatic muscle; B = Mental-tentorial muscle; Am 

 Arm of mentum; L =-- Fleshy lobe; S == Spinneret; C, C', C" -- Tracheae; 

 Sd == Salivary ducts; /', /" = : Dilator muscles of the threadpress; G 

 Filippi's glands. 



Fig. 8. Threadpress. 



/', and I" - A few of the muscle attachments. 



