113 



Figure 2k. Oral scleritas of Musea domestica shewing the 

 intermediate scleri te( I . ) , the lateral hooks 

 (L.H.), the median ventral arc (M.V.A. ) , and 

 the oral grooves (O.G .) . 



igure 25. Oral sclerites of Ophyva x&r.esaens shewing the 

 lateral hooks (l_. H. ) , the nedian ventral arc 

 (M.V.A. ), the oral bars (0. B. ) , the anterior 

 r i bbon (A. R. ) , and the cutaneous teeth(C.T.). 



