432 INSECTA. 



This subgenus consists of five or six species, two of which 

 are from New Holland, and the remainder from America*. 



The three first joints of the tarsi in the two following subgenera 

 are in the form of a reversed heart, and have no membranous pro- 

 longation tmderneath ; the fourth is deeply bilobate ; the last, but 

 slightly elongated, exhibits no projecting and silky appendage be- 

 tween its crotchets. The antennae are filiform, simple, or at most 

 pectinated, and never consist of more than eleven joints. 



Ptilodactyla, Jllig. — Pyrochroa, De Geer. 



Distinguished by the semi-pectinated, or serrated antennae of the 

 males. 



The species of this subgenus are peculiar to America f . 



Dascillus, Lat. — Atopa, Fah. 



Only differs from Ptilodactyla in the antennas, which are simple 

 in both sexes \. 



The remaining Ccbrionities have small mandibles which project 

 but little, or not at all, beyond the labrum, a generally soft and al- 

 most hemispherical or ovoid body, and palpi terminating in a point. 

 The antennse are simjile, or but slightly dentated. The posterior 

 legs of several are fitted fur leajjing. They live on aquatic plants. 



In these, the penultimate joint of the tarsi is bilobate. The second 

 and third of the antennae are shorter than the fourth. 



Elodes, Lat. — Cyphon, Fab. Dej. 



The posterior thighs differing but little in thickness from those 

 of the preceding subgenus §. 



ScYRTES, Lai. — Cyphon, Fab, 



Thighs of the posterior legs are very large, and the tibiae terminated 

 by two stout spurs, one of which is very long, a circumstance which 

 enables these Insects to leap. The labial palpi are forked, and the 

 first joint of the posterior tarsi is as long as all the others taken 

 together ]]. 



In those, all the joints of the tarsi are entire. 



Nycteus, Lat. — Hamaxobium, Zieg. — Eucynetus, Schiip. 



The third joint of the antennae very small, and much shorter than 

 the second and following one, the last almost granose ; the four tibiae 



* Rhipicera maryinala, Lat., Cuv., R^gn. Anim. Ill; Kirby, Lin. Trans., XII, 

 xxi, 3 ; — Polytomus marginatiis, Dalm., AnaL Entom. p. 22 ; — P.femoratiis, Id. lb. 

 21 ; — P. Mijstaciniis, Id. lb. 22 ; Hisjm mystacina, Fab. ; Drur. Ins. Ill, viii, 7. I 

 have seen another species in the collection of Count Dejean, entirely fulvous, sent 

 to him from America by Major Le Conte. 



f Ptylodactyla daferina, lUig. ; Pyrochroa nitida, De Geer, Ins., V, xiii, 6 — 17. 



X Atopa cerrina, Fab. : A. cinerea, var.. Id. ; Ptinus testaceo-villosus, De Geer, 

 IV, ix, 8 ; Cistela cervina, Oliv., Col., Ill, 54, 1, 2, a. 



§ The first di\ision of Cyphon, Fab. 



II The second division of Cyphon, Fab. See the Catalogxie, &c. of Dejean. 



