AMBATES., 157 
prothorax, extending over the whole of the flanks; one, large and oblique, at the sides 
of the elytra before the middle, extending downward over the sides of the metasternum ; 
one below this, transverse, and another at the apex ; and one on each side of the second 
ventral segment. The posterior tibie have a dense fringe of long ochreous hairs along 
the inner edge from the middle to the apex in the male, and a fringe of short whitish 
hairs in the female. The ventral depression of the male is shallow. 
The variety is represented by a single specimen ( ) presented to us by Dr. Heller. 
2. Ambates polymorphus, sp. n. (Tab. IX. figg. 11, ¢; 12 ¢,13 9, vars.) 
Elongate, shining, black, the legs sometimes in part ferruginous ; the prothorax with a broad vitta on each 
side, extending forward on to the head and rostrum, and another on the lower part of the flanks, the 
elytra each with a broad sinuous submarginal vitta extending from the base to the apex, a large patch 
at the side of the metasternum, another at the side of the second ventral segment, and a small lateral 
spot on the second or second and third segments, densely clothed with oval yellowish-white scales, the 
vestiture of the rest of the surface very fine, blackish or fuscous, the metasternum and abdomen with a 
broad space down the middle almost bare. Rostrum very stout, strongly arcuate, bent downwards at 
one-third from the tip, carinate and coarsely punctate to about the middle and more finely punctate 
thence to the apex, a little smoother in the 9. Prothorax nearly as long as broad, subconical, slightly 
rounded at the sides; closely, finely punctate, and with indications of a smooth median line. Elytra 
elongate, with rows of fine punctures placed in shallow stri, the interstices flat and minutely punctate, 
the subapical callosities prominent. Ventral segments 1 and 2 broadly excavate down the middle, and 5 
with a large shallow depression, and the posterior tibis strongly ciliate within, in the ¢. 
Var. a. The sinuous elytral vitta connected laterally with the metasternal patch. 
Var. 6. The sinuous elytral vitta interrupted at the middle, the apex of the anterior portion extending more 
or less inward towards the suture, the posterior portion curved. 
Length 84-104, breadth 33-33 millim. (¢ @.) 
Hab. Costa Rica, Irazu (Rogers: var. a); Panama, Chiriqui (coll. Fry: var. {3), 
Bugaba, Volcan de Chiriqui (Champion: all three forms). 
Nine specimens, four belonging to the form selected as typical. The broad, complete 
or interrupted submarginal stripe, which always reaches the apex, the maculate sides 
of the body beneath, the prominent subapical callosities, and the ciliate posterior tibie 
of the male, readily distinguish 4. polymorphus. Several species of Hilipus vary in a 
somewhat similar way. ‘The propleural stripe is evanescent in the varietal forms. 
3. Ambates heilipoides. (Tab. IX. figg. 14, 14a,¢; 15,¢, var.) 
Ambates heilipoides, Chevr. Ann. Soc. Ent. Fr. 1877, p. 343. 
Var. The white sinuous lateral vitta of the elytra interrupted posteriorly. 
Hab. Mexico, San Andres Tuxtla (Sad/é), Teapa (Pilate1, H. H. Smith); Guaremata, 
Teleman in Vera Paz (Champion). | 
Of this species we possess five specimens from Teapa, one from San Andres, and 
one from Teleman, the last-named (fig. 15) having the broad whitish stripe on the 
outer part of each elytron abruptly interrupted posteriorly. In this insect the 
vestiture of the under surface is entirely brownish. The first two ventral segments 
