8 RHYNCHOPHORA. 
in the two sexes. In Hilipus and the allied genera the tibie are furnished with two 
matted, long, spine-like tufts of hair near the inner apical angle, these projecting 
forwards on either side of the claw. The males are usually distinguishable by the 
shorter and more rugose rostrum, and often by a longitudinal depression on the first 
ventral segment, or two tufts of matted piliform scales at its apex, as well as by the 
different position of the tibial claw in some cases. Various modifications of structure 
are to be found in H. securiger (a peculiarly;formed antennal club in the ¢ ), H. appen- 
diculatus (the claw of the posterior tibia replaced by a spoon-shaped process in the ¢ ), 
H. strigipectus (a dense brush of long hairs on the first and second joints of the anterior 
tarsi in the 3), H. empiricus, H. penicillatus, &c. 
The genus is characteristic of the forest-regions of Tropical America, the various 
species attacking the branches of fallen trees, by beating which very many forms were 
obtained by myself in Guatemala and the State of Panama. 
The species occurring within our limits may be grouped as follows :— 
I. Tibiz not mucronate, the claw in both sexes forming a continuation of the 
inner apicalangle. . . . 1. 1 6 we we ew ew ew ew eh he) 6) 6 ir ts, 8. str.] 
a. Scrobes not confluent at the base of the rostrum beneath. 
a’. Elytra seriate-punctate. . . 2 1. 2 ee ew 6 ew ew we es). «Species 1-25. 
b'. Elytra irregularly foveolate . . . 2. . . . . + « « « . . . Species 26, 27, 
c’. Elytra simply granulate . . . . . . . a - Species 28, 29. 
b. Scrobes confluent at the base of the rostrum beneath . » © « « « « . Species 30. 
II. Tibiz more or less distinctly mucronate at the inner apical angle (at least in 
the ?), the claw arising from about the middle of the apical margin, 
sometimes from nearer the inner or the outer angle in the @. 
c. First ventral suture straight, or simply sinuate in the middle, the first 
segment sometimes subangularly produced (H. angulosus). 
d’. Eyes large and contiguous above. 
a’’, Antennal club securiform in the ¢, ovate in the 9? - . Species 81. 
bo’, Antennal club ovate in both sexes . 2. 2. . 2. ww wee, Species 32-87. 
e’. Eyes smaller and more or less separated above. 
e’, Prothorax and elytral interstices coarsely tuberculate . 
d’’, Prothorax and elytral interstices granulate or smooth. 
al”, _Rifth ventral segment without longitudinal median sulcus. 
. Hind tibiz with a flattened spoon-shaped process at the apex in 
- Species 38-40. 
the 3 woe ss - + « . Species 41. 
6°. Hind tibiz with a clay at ; the apex in the two sexes, 
a’. Prothorax and elytra with velvety-black patches . . . . , Species 42, 43. 
6°. Elytra, at most, with velvety-black patches. . . . Species 44-75. 
6”. Fifth ventral segment with a longitudinal median sulcus in both 
SEXES . oc 4 . Species 76. 
d. First ventral suture bisinuate, the first segment being broadly produced § in 
the middle in both sexes Species 77 | 
