TACHYGONUS.. 131 
Group TACHYGONINA, 
This group has hitherto included two genera only—Tachygonus, Schénh., of the New 
World, and Dinorhopala, Pasc., from Burma &c. Tachygonus is here divided into two, 
and a third unnamed S.-American genus (with the posterior femora strongly and 
abruptly clavate at the apex) is represented in the British Museum. 
TACHYGONUS. 
Tachygonus, Schénherr, Gen. Cure. i. p. 811 (1833) ; Lacordaire, Gen. Col. vii. p. 168; Kirsch, 
Berl. ent. Zeitschr. 1875, p. 252; Leconte, Proc. Am. Phil. Soc. xv. p. 265; Casey, Ann. N. 
York Acad. Sci. ix. pp. 679-681. 
Tachyopus, Sturm, Cat. p. 352 (1843). 
Fourteen species of this genus have been described—six from S. America, one from 
Mexico, and seven from the United States, and many other unnamed Tropical-A merican 
forms are to be found in collections. Tachygonus is here restricted to the species with 
a 7-jointed funiculus * and an ovate antennal club (Tab. VIII. fig. 19¢). Fourteen are 
now recorded from within our limits, seven of which are represented by single specimens. 
The powerful hind legs of these insects, as noted long ago by Zimmermann, are used 
for grasping leaves, and not for saltatorial purposes. 
a. Posterior tibiz arcuate; elytra subcordate. 
a’. Prothorax without dense tufts of erect blackish hairs. 
a’. Elytra with a white scutellar spot. 
a’. Posterior tibize very broadly dilated ; posterior femora 4-dentate. Jaticrus, sp. 0. 
b°. Posterior tibie narrower, not wider than the femora. 
a‘, Sete: of the upper surface coarse ; posterior femora 5-dentate. quinquedentatus, sp.n. 
b*. Setee of the upper surface fine; posterior femora 4-dentate . curvicrus, sp. n. 
6°. Elytra each with a narrow transverse arcuate band of pectinate 
scales, extending down the middle of the disc; posterior femora 
with several long and short teeth . . . . 2 ee ee .) Semirufus, Sp. D. 
B. Prothorax with two dense tufts of erect blackish hairs, i in addition to 
the usual sete. 
c. Elytra simply setose, the pectinate scales few in number, the dorsal 
striz finely punctate and separated by flat interstices ; anterior 
and intermediate femora black; posterior femora 4-dentate . . migrocristatus, sp. n. 
d?, Elytra setose, and each with a whitish tuft near the suture below 
the base and numerous pectinate scales, the strie very coarsely 
punctate throughout. 
® Casey (op. cit. p. 681) states that the funiculus is 7-jointed in the N.-American forms: 7. lecontei is 
figured by Sturm with a 6-jointed funiculus and by Imhoff with 5 joints only. 
SS 2 
