74 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 1 39 



of which are dorsal and one ventral. In Aedes aegypti the dorsal 

 diverticula (A, ddv) are small, flat, elongate sacs with slender necks 

 diverging forward and laterally from the oesophagus (C). The single 

 ventral diverticulum (A, vdv) has a long, slender neck which ex- 

 pands into a large sac in the anterior half of the abdomen. This 

 ventral diverticulum corresponds with the usual "crop" of other 

 Diptera. 



Mai 



\ Reot 



Fig. 29. — Alimentary canal and salivary glands of the adult female of 



Aedes aegypti. 



A, Sectional view of body showing alimentary canal and salivary system 

 (glands on left displaced). B, The salivary glands. C, The oesophageal 

 diverticula, ventral. D, Rectal sac and papillae. 



AInt, anterior intestine ; CbP, cibarial pump ; ddv, dorsal diverticulum ; 

 Hphy, hypopharynx ; Lb, labium ; Lm, labrum ; Mai, Malpighian tubules ; Oe, 

 oesophagus ; PhP, pharyngeal pump ; Red, rectum ; rp, rectal papillae ; SIDct, 

 salivary duct ; SlGld, salivary glands ; SIP, salivary pump ; vdv, ventral di- 

 verticulum; Vent, ventriculus. 



The ventriculus (fig. 29 A, Vent), which is the functional stomach 

 of the insect, for most of its length in the female mosquito is a 

 narrow tube that extends upward through the thorax and then turns 

 backward into the abdomen where it ends in a saclike enlargement that 

 joins the intestine. The first part of the latter, or anterior intestine 

 {AInt), is a short, slender tube thrown into a small loop. Its anterior 

 end, the pyloric region, joins the ventriculus by a funnel-shaped ex- 

 pansion. At the other end the anterior intestine is continued into the 



