94 HETEROMERA. 
1. Argoporis bicolor. (Tab. V. fig. 1, 3.) 
Cerenopus bicolor, Lec. Ann. Lyc. New York, v. p. 148°. 
Argoporis bicolor, Horn, Rev. Ten. N. A. p. 825°. 
Hab. Norrn America, Vallecitas1, Arizona 2, Colorado desert ?.—MeExico, Sonora 2 
(Morrison). 
2. Argoporis rufipes. (Tab. V. fig. 2,2.) 
Dull black, the front of the head reddish brown. Head finely and closely punctured; prothorax about a 
broad as long, moderately convex, feebly rounded at the sides, narrowing a little towards the base, the 
disc shallowly impressed before the base, closely and very finely punctured ; elytra comparatively rather 
short, but little narrowed towards the base, coarsely punctate-striate, the interstices slightly raised and 
costate just before the apex, flat or very feebly convex for the rest of their length, very finely and closely 
punctured ; legs and antenne red or reddish brown. In the male the intermediate and posterior tibie 
are finely, the anterior tibie rather coarsely and closely, denticulate within ; the anterior femora swollen, 
and with a short blunt tooth near the base; the posterior femora much swollen and with three or four 
stout teeth, the inner of which is the longest. 
Length 103-13 millim. (3 2.) 
Hab. Mexico, Hacienda de San Miguelito, San Luis Potosi, Parras, and San Pedro 
in Coahuila, Valle del Maiz (Dr. Palmer). 
Sent in plenty by Dr. Palmer. Allied to A. bicolor and differing as follows :— 
smaller, duller, and comparatively shorter in form; the thorax closely and distinctly 
punctured ; the posterior femora of the male less abruptly swollen, the teeth differently 
arranged (in the same sex of A. dicolor the swollen posterior femur is produced within 
into a large triangular tooth; this tooth is bifid and furnished on each side with 
smaller teeth); the intermediate femora in the male unarmed. 
3. Argoporis brevicollis. 
Dark reddish brown, dull, subopaque. Head very closely and rather coarsely punctured, almost rugulose, the 
epistoma scarcely smoother and sharply defined posteriorly ; prothorax broad, a little broader than long, 
convex in front, strongly rounded at the sides, narrowed towards the base, widest about the middle ; hind 
angles obtuse and almost rounded, the disc slightly flattened towards the base, almost smooth; elytra 
rounded at the sides, strongly narrowed towards the base, the humeri prominent and subdentiform, 
coarsely punctate-striate, the interstices slightly raised and costate just before the apex, flat and almost 
impunctate for the rest of their length ; antenne and legs red. 
Length 114 millim. (9.) 
Hab. Muxico, Ventanas (Forrer). 
Two examples. This species may be known by the close and coarse punctuation 
of the head, the short thorax, and the strongly rounded sides of the thorax and elytra ; 
the male has yet to be discovered. 
4, Argoporis crassicornis. (Tab. V. fig. 3, ¢.) 
Reddish brown or black, convex, shining. Head very coarsely and rugulosely punctured between the eyes, the 
epistoma smoother and sharply defined posteriorly ; prothorax convex, about as long as broad, broad in 
front, narrowed towards the base, the disc flattened or impressed before the base, smooth, almost impunc- 
