Thompson. — Anatomy of Mosquito. 
i 
PLATE 16. 
Fig. 37. Esophageal valve and cardia of a full grown larva, striated border 
on cardia cells not distinct. 
Fig. 38. Esophageal valve in a pupa four hours old ; the left hand wall is 
ventral. 
Fig. 39. Separation of the degenerated dermis of the epipharyngeal pit (epi) 
from the buccal cavity ; longitudinal section of pupa ten hours old. 
Imaginal muscles (x) are beginning to form in the old masses of the 
retractors of the flabellae and epipharyngeal muscles and the hypo- 
pharyngeal muscles (hyp m) are forming at the base of the salivary duct. 
Fig. 40. Esophageal valve of a pupa eleven hours old. The left hand wall is 
ventral. / res = ventral esophageal diverticulum. 
Fig. 41. Esophageal valve of adult female mosquito; the right hand wall is 
ventral. 
Fig. 42. Surface of ventral food reservoir or diverticulum of adult female 
showing the “striae” of the intima, a muscle fiber, and the nuclei of 
the epithelium. Bismark brown. 
Fig. 43. Esophageal valve in a pupa ten hours old ; the left hand wall is 
ventral, v = valve, f res — ventral diverticulum. 
Fig. 44. Colon and rectum of a larva of the mosquito, longitudinal section. 
Fig. 45. Portion of the wall of the stomach and ileum of a mosquito larva, 
showing ring of naked epithelium ( x ) at the junction of the two regions 
where the Malpighian tubules enter. 
Fig. 46. Transverse section of mouthparts of male mosquito. 
Fig. 47. Transverse section of mouthparts of female mosquito; level of tip of 
palps. The groove on the dorsal face of the labium in which the other 
stylets are received, has been obliterated by swelling during dehydration. 
Fig. 48. Ventral aspect of head of Culex pupa at the moment that the larval 
head cuticle is ruptured. Dissected out and viewed as an opaque 
object, fold = fold in front of labial bud (li), see pi. 15, figs. 34 and 36. 
Fig. 49. Side view of head of Culex pupa at moment when the respiratory 
trumpets free themselves by rupture of the thoracic cuticle ; dissected 
out and viewed as an opaque object. 
Fig. 50. Side view of the head of Culex pupa at a time just prior to the com¬ 
plete release of the mouthparts and legs from the larval cuticle. Their 
apices were still enclosed in the old sheaths. Dissected out and viewed 
as an opaque object. Drawn on a larger scale than the other figures. 
