Hyla andersonii 239 



MATING 



Male. — {From life). Upper parts (dorsum, upper lip, angle of mouth and 

 dorsal surfaces of limbs) cress green to a light cress green, in sides lighter to 

 deep chrysohte green. Stripe along side, behind vent, along limbs, upper 

 jaw cartridge buff, ivory yellow or marguerite yellow or seafoam yellow. Area 

 back of and along side of vent vinaceous drab, purple drab becoming over 

 tympanum dark purplish drab. A little of same color scattered on throat. 

 Tops of forefeet and hind feet deep brownish drab except for first two digits 

 which have the cadmium yellow spots on the top. Fore part of under side of 

 antebrachium and under part of brachium with cadmium yellow — deep 

 chrome or orange spots, also a little area in axilla ; also groin and most of fore 

 and hind part of femur, whole undersides of tibia and inner side of foot. All 

 these orange or deep chrome spots on a raw sienna or mars yellow background. 

 Iris more or less vinaceous drab or purple drab with vinaceous tawny spots. 

 Under parts white except for dark purplish drab of throat. 



Female. — {From life). Throat white, grayish or with slight purplish drab 

 tinge. Green patch below angle of mouth usually white edged, usually absent 

 in males. 



Structural differences. The differences in color already noted, and larger 

 females than males are the perceptible differences. Noble and Noble (1923, 

 p. 433) note that the male has minute asperities on inner and upper side of 

 thumb. They gave average length from vent to snout of ten females as 40.9 

 mm. (extremes 44 and 38 mm.), of fifteen breeding males as 36.7 mm. (ex- 

 tremes 35-38 mm.). The females, as in most of our Hylas, are larger. Al- 

 though some authors have spoken of them as "about 2 inches in body length, I 

 have seen none over 47 mm. in length. The range of males seems to be from 

 30 mm.-4i mm. in body length; of females 38-47 mm. No doubt sexual 

 males below 30 mm. and females somewhat below 38 mm. will be found. 



Duration, night or day. Amplexation. All the records of mating by Bar- 

 bour, Davis and Noble and Noble were for the evening. In each case ap- 

 parently the pair broke after laying. In no instance are abnormal embraces 

 recorded or mentioned. All doubtless are axillary or supra-axillary. The last 

 authors speak of "a normal supra-axillary amplexus" and describe the 

 amplexus. 



OVULATION 



Habitat and period. Barbour (19 16, pp. 6, 7) the first to record a mated 

 pair and secure eggs writes "Up to this year (1915) I have known nothing 

 regarding the breeding habits or the time of egg-laying of these Hylas, but 

 have assumed that it was in May, as Davis reported them singing very plen- 

 tifully at that time. This year, however, we did not get down to Lakehrust 

 until the 8th of July, when we found the Hylas in goodly numbers in the white 

 cedars about the lake. After capturing a number of singing males (I had 

 never taken a female before), my light flashed by the merest chance upon a 

 pair of Hylas sitting well up in a pine tree, in embrace. This, and another 

 taken, in a similar situation, were the only females secured, although we took 



