604 



Dr. D. Keilin on 



Larva A: Figs. 1 and 2. — Full-grown larvas, seen laterally. Fig. 3.— 

 Anterior portion of tlie larva, showing the thoracic segments, the 

 head or the pseudocephalon, and the bucco-pharyngeal armature : 

 a, antenna ; h, maxillary palps ; c, ventral sensory organ ; d, labial 

 palp ; h, hypopharyngeal sclerite ; i, intermediate sclerite ; /, lateral 

 hooks ; p, basilar or pharyngeal sclerite ; *, prothoracic spiracles. 

 Fig. 4. — Posterior end of the siphon, showing the postabdominal 

 spiracles. The scale represents only the magnification of the 

 tiers. 1 and 2. 



