NO. 1156. VARTATI0N8 OF HYLA REfilLLA—TEST. 483 



and tarsi, but not alwayH, and rarely one or two small spots on the 

 rami), posterior to the lonj^itudinal stripes, as shown in a small male of 

 No. 11498, U.S.N.M., from Walla Walla, Washington. 



Style III (li^'. >) has the lonj,atudinal stripes only about two-thirds 

 as long as in style II, there are additional dorsal blot(;lies, the bars on 

 the hind legs are always present and pronounced, and the arms and 

 forearms possess light bais. The dorsal spots, as admirably shown in 

 specimens of No. 14727, U.S.N.M., from J^'ort Klamath, Oregon, are 

 irregularly arranged in three rows, two continuing out the line of the 

 stripes, and the third beginning about the middle of the body and run- 

 ning back along the median line, tlie last one being frefjuently h)cated 

 just above the anus. Two small s[)ots are situate above the tympana 

 midway between them and the cephalic blotch, and even with the end 

 of the Y stem. The cephalic blotch is less often Y or T shaped, and 

 rather a concavesidcid triangle. A few minute spots may be exterior 

 to the larger blotches. One individual referred to style 111, from 

 No. 1194.'{, IJ.S.N.M., "Oregon," has the cephalic triangle reduced to a 

 cross band, and the dorsal blotches broken uj) into over 30 irregular 

 small sjiots with tlie ground color showing through their centers, pro- 

 ducing a most curious, mottled appearance. 



Styles IV (fig. .'5) and V are natural sequences of style HI. in style 

 IV the anterior dorsal stripes are longer than in style 111, resembling 

 the condition in style II, and the posterior blotches are confluent into 

 one or two more short strii)e8. There are also more 8i)ots on the top 

 and sides of the rump and the dorsolateral spots are larger. In this 

 and V as in III, the bars and bands on the limbs are well marked. 



Style V (fig. Ci) passes easily from IV, the stripes lengthening, and 

 the larger blotches becoming stripes, so that there are three longitudi- 

 nal dorsal series of more or less broken stripes, one medial and two 

 lateral, with numerous blotches and 8i)ots, especially about the rump. 

 The lateral stripes begin above the tympana. 



Of these, style I is distinct and sharply outlined by the absence of 

 any dorsal markings whatever, and II is usually unmistakable, but 111, 

 IV, and V have a tendency to run into each other, and fre(|uently can 

 be se])arated only in a general way. 



The different styles have been described, beginning with the light- 

 est, as though those with more markings were the result of evolution 

 in the adding of color. Yet, as a matter of fact, it is probable tliat 

 the darkest style of coloration is closer to the ])rimitive appearance, 

 for notonly do the majority of the other North American hylas i)ossess 

 the triangular blotch on the head, or two spots corresponding to it, 

 with often dorsal markings also, but this condition is found as well in 

 Chorophilutt, Acris^ and lianas showing the wide extent of more color. 

 It is a curious fact that the larger individuals are the darker, as indi- 

 cated l)y figures drawn from the comparison of many S[)ecimens. There 

 are exceptions, but that the averages from the bulk of individuals 



