30 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 74 



in dorsal aspect than mid dorsal line. Muciferous crypts distinct. 

 The dorsal row from either side of the insertion of the dorsal crest 

 extends obUquely forward and outward to join the principal lateral 

 row which extends from above the middle of the tail musculature to 

 back of the eye. Here it forks, sending a supraorbital branch far 

 past the nostril to snout and an infraorbital branch also to the snout 

 and quite far below the nostril in its course. Below the principal 

 lateral series is a lower one on side around the spiracle but forward it 

 is not veiy distinct. 



Mouth 'parts. — Teeth -§-. Edge of upper labium slightly larger 

 than beak and fringed with teeth. In either corner a row of teeth 

 about one-third to one-fourth of the upper fringe. The outer end 

 of this lateral row usually (abnormal in figure in this regard) does 

 not extend beyond the end of the upper fringe. The median space 

 between lateral rows is one to two times either row, nearer the con- 

 dition in R. pipiens. The third lower row about equal or slightly 

 larger than single row of lower labial papillae, one-third to two- 

 sevenths shorter than first or second rows which are equal and larger 

 than the beak. The tadpole is clearly of the R. pipiens or R. spheno- 

 cepliola type. 



Measurements. — Length of body (28-33.5 mm.) in tail (74-81 mm.) 

 2.15-2.85, average 2.62. Width 13.5-19 mm.) of body in its own 

 length 1.6-2.07, average 1.8. Depth (12-15 mm.) of body 0.88-1.7 

 in body width, average 1.14. Depth of body 1.5-2.4 in body length, 

 average 2.01. Depth (10-18.5 mm.) of tail in length of taii 2.6-3.5, 

 average 3.05. Muscular part (6-9 mm.) 1.45-1.9 in depth of tail, 

 average 1.75. Spiracle 1.1-1.7 nearer base of hind legs or veut region 

 (14-16.5 mm.) than the tip of the snout, average 1.36. Spiracle 

 1.4-2.0 nearer eye than base of hind legs or vent, average 1.55. Eye 

 1.0-1.3 nearer to spiracle (5.0-7.0 mm.) than tip of snout (6-9 mm.), 

 average 1.12. Nostril 1-1.5 nearer eye (2.5-5.0 mm.) than snout 

 (3.0-6.0 mm.), average 1.25. Mouth (3.0-5.0 mm.) usually 0.84-1.26 

 larger than internasal space (2.8-5.0 mm.), average 1.06. Mouth 

 contained 1.25-1.66 (average 1.5) in interorbital distance (4.5-8.0). 

 Internasal space contained in interorbital space 1.3-1.9, average 1.57. 



The dimensions of the largest tadpole are: 



?r,^S Mm. 



Mm. 



Total length 81. 



Body length 29. 



Body depth 14. 



Body width 15. 



Tail length 53. 



Tail depth 15. 



Musculature of tail 8. 



Spiracle to snout - 17. 



Spiracle to.vent 14. 



Spiracle to__^eye 7. 



Ej^e to snout 9. 



Eye to nostril % 4. 



Nostril to snout 6. 



Mouth 5. 



Interorbital distance 8. 



Internasal distance 4. 2 



