20 



normal ovarian functions by replacing male stimuli. 



51. Cuellar, H. S. 1978. Continuance of circannual reproductive 

 refractoriness in pinealectomized parthenogenetic whiptails (Cnemido - 

 phorus uniparens ). 3. OF EXPERIMENTAL ZOOLOGY 206(2): 207-2U, 



The pineal organ does not play a role in the endogenous circannual 

 reproductive cycle of this lizard but may be involved in thermoregula- 

 tion. 



52. — . 1979. Disruption of gestation and egg-shelling in delutein- 

 ized oviparous whiptail lizards Cnemidophorus uniparens (Reptilia, Tei- 

 idae). GENERAL & COMPARATIVE ENDOCRINOLOGY 39(2): 150-157. 



Corpora lutea evidently function to control gravidity and shelling 

 in this reptile and a corpus luteum hormone is probably responsible for 

 this control. An undescribed ovulation behavior and its possible hor- 

 monal control is also discussed. 



53. — . and O. Cuellar. 1977a. Absence of gonadal refractoriness in 

 the lizards Cnemidophorus uniparens and Sceloporus graciosus . COPEIA 

 1977(1): 185-188. 



The results suggest that the physiology of sexual refractoriness 

 in C. uniparens (collected in Socorro County, NM) is mediated by the 

 neuroendocrine system. 



54. — . and — . 1977b. Evidence for endogenous rhythmicity in the 

 reproductive cycle of the parthenogenetic lizard Cnemidophorus uni- 

 parens (Reptilia: Teiidae). COPEIA 1977(3): 55i*-557. 



Lizards from Socorro County, New Mexico, were maintained in cap- 

 tivity under either short (10L:l'tD) or long (1^L:10D) photothermal re- 

 gimes. Some lizards from both groups experienced two consecutive repro- 

 ductive cycles. This demonstrates the existence of an endogenous circ- 

 annual rhythm in the reproductive cycle of this species. 



55. — . and — . 1977c. Refractoriness in female lizard reproduc- 

 tion: a probable circannual clock, SCIENCE 197(4302): 495-497. 



Postreproductive Cnemidophorus uniparens maintained under free- 

 running conditions of constant darkness for 7 months became reproductive 



