HYLIDA. — CVII. 183 
a. Forehead and crown bony, rough; skin slightly tuberculate; sacrum not 
co-ossified with coccyx ; vomer with teeth: heel with a spadelike pro- 
cess covered by a horny sheath; toes more or less webbed. 
SCAPHIOPUS, 263. 
263. SCAPHIOPUS Holbrook. (ocxadn, spade; zovs, foot.) 
515. S. holbrooki Harlan. Spapkr-root. Olive brown, a 
yellowish band on each side. E. U.S., rare W. of Penn.; bur- 
rows in the ground; extremely noisy in spring. ‘“ The machinery 
for producing sounds equal to an ordinary steam whistle is ap- 
parently confined to the throat of this rare and curious Batra- 
chian.” (Abdott.) L.3. (To Dr. J. E. Holbrook.) 
Famity CVII. HYLIDAG. (THe Tree Froes.) 
Fingers and toes more or less dilated into viscous disks at their 
tips; upper jaw and vomer with teeth; lower parts usually covered 
with small warts; ear well developed. Genera 14; species 170; 
found in most warm regions, especially abundant in tropical Amer- 
ica; noted for their loud and varied voices, some of them being 
heard at all times from early spring until frost comes. 
a. Disks small; fingers not webbed; palustrine. 
b. Toes broadly webbed; tympanum indistinct... . . . . Acris, 264. 
bb. Toes scarcely webbed; tympanum distinct. . . CHOROPHILUS, 265. 
aa. Disks round, conspicuous; fingers somewhat webbed; skin roughened ; 
MEWOUEH Mer in iag Vial sp rel oye a) cir i ar oe Meena teil ctor in) as.| SAMS emia 
264. ACRIS Dumeril & Bibron. (dxpis, locust, from its 
sharp note.) 
516. A. gryllus Le Conte. Cricket Froc. Hind legs very 
long. Brownish above; middle of back and head bright green 
or reddish brown; a dark triangle between the eyes; sides with 
three oblique blotches ; a white line from eye to arm. L. 1}. 
E. U.S., in swamps, not on trees; var. gryllus, S., N.to S.Tll. The 
northern form is var. crepitans Baird. Its snout is more blunt and 
the inner surface of thigh not reticulate; its note resembles the 
rattling of pebbles. (ypuAXos, a pig.) 
265. CHOROPHILUS Baird. (yopds, chorus; didos, lover.) 
517. C. triseriatus (Wied). Swamp TrEE Frog. Bluish ash, 
a dark dorsal stripe from snout backward, bifureating above middle 
of body ; a stripe on each side of this and one on side of head 
and body, the later pale-edged below. L.1. Variable. In swampy 
ground, rarely in trees. Its voice is a “rattle with a rising inflec- 
tion at the end” (Cope), or like the scraping of a coarse-toothed 
comb. (Lat. 3-rowed.) 
