THE PUPAL STAGE OF CULEX. 71 



DESCRIPTION OF PLATE V., 

 Illustrating Mr. Hurst's Paper on the Pupa of Culex. 



Fig. 1. Side view of the male pupa (X 10). 



Fig. 2. Ventral view of the female pupa partially extended (x 10). 



Fig. 3 to 6. Successive stages in the metamorphosis of the epithelium 

 of the hinder part of the stomach ( X 225). 



Fig. 7. Sagittal section of a very young female pupa (x 50). 



Ant. Antenna. Ao. Aorta. At. Respiratory siphon. B. Buccal 

 chamber. CG. Cerebral ganglion. D. Gastric pouch. F. Fin. Fe 1. 

 Femur of the first leg. G. Ganglia. Gn. Outgrowth of "ninth 

 segment," within which the gonapophyses develop. Hr. Halter. 

 H. Head. Ht. Heart. In. Intestine. Lb. Labium. Lbr., Lr. Labrum. 

 M. Malpighian tube. M.Ap. Its opening into the intestine. MS. 

 Mesosternum. ML Metasternum. Mx. Maxilla (first). Mxp. Its 

 palp. N.C. Nerve commissures and ventral cord. Oc. Ocellus. 

 Od. Median oviduct. Op. Compound eye. P. Prosternum. R. 

 Rectum. S. Aperture of salivary duct. SD. Salivary duct. SG. 

 Subcesophageal ganglion. Si. Larval respiratory siphon introverted 

 into eighth segment. Sp. Spermatheca. St. Stomach. Ta 1, Ta 2. 

 Proximal joints of tarsi. Ti 1, Ti 2, Ti 3. Tibiae. Tr. Trachea. 

 W. Wing. 



I., II., III., etc. First to eighth segments of abdomen. 



