146 SHYNCHOPHORA. 
A. cavisternum, A. mexicanus, &c. all four tubercles are well-developed; A. biolleyt 
might easily be mistaken for a Phytobuid. 
a. Metasternum deeply excavate and emarginate (the cavity open behind in 
A. cavisternum), the rostral canal sometimes extending to far beyond the 
middle coxe. 
a’. Eyes very large, subcontiguous ; prothorax 4-tuberculate ; elytral inter- 
stices rugulose; pygidium (¢) deeply foveate . . . . + + + + 
b'. Eyes smailer, distant. 
a’. Elytral interstices with small setigerous tubercles ; prothorax bituber- 
culate, without prominences on the disc. . . . - «+ + «© * 
b’. Elytral interstices rugulose. . 
a’. Prothorax 4-tuberculate. 
i. Head sulcate between the eyes: upper surface shining. . . - 
. Head not sulcate between the eyes: upper surface dull 
b°. "Drothorae bituberculate, the disc convex . . . . o 8 ee 
b. Metasternum at most shallowly depressed between the middle coxe, the 
rostral canal not extending beyond the mesosternum ; elytral interstices 
rugulose. . 
ce’. Prothorax 4- or 6-tuberculate. 
ce’. Mesosternum with a prominent ridge on each side between the coxe; 
rostrum comparatively slender and almost straight, much smoother 
inthe @ thaninthe¢@ . . .. . 2. 6 6 ew we te ee 
d’. Mesosternum at most feebly carinate on each side between the coxe. 
c’. Rostrum stout, rugose in both sexes; mesosternal depression 
deeper. 
c'. Elytra indistinctly cinereo-variegate ; intermediate tibie of the ¢ 
sharply unguiculate. . . . . 1 ee oe ee 
dad‘. Elytra distinctly cinereo-variegate ; intermediate and posterior 
tibie of the ¢ sharply unguiculate. . . . eo ee 
d*, Rostrum comparatively slender, rugose in the g and almost smooth 
in the 2 ; prothorax 6-tuberculate; mesosternal depression almost 
obsolete 2. 2 1. ew we ee ee ee 
d', Prothorax bituberculate, the disc at most obsoletely binodose. . . . 
e'. Prothorax without tubercles ; mesosternal depression very shallow . . 
1. Auleutes megalops, sp. n. 
megalops, sp. 0. 
asperipennis, Sp. D. 
sulcifrons, sp. 0. 
cavisternum, sp. 1. 
instabilis, sp. D. 
inspersus, Sp. N. 
mexicanus, 8p. Nn. 
similis, sp. n. 
biolleyi, sp. n. 
dispersus, sp. D. 
inermis, Sp. N. 
Short ovate, broad, black, variegated above with rufo-piceous, the tip of the rostrum, antenne, apical margin 
of the elytra, knees, and tarsi ferruginous; the vestiture very fine and scattered. Head densely, minutely 
punctate, feebly carinate on the vertex; eyes very large and prominent, almost contiguous in front ; 
rostrum strongly arcuate, stout, very little longer than the prothorax, depressed at the base, rugulosely 
punctate, smoother at the tip. Prothorax subconical, finely punctate, the disc gibbous and strongly 
binodose, the lateral tubercles prominent, the anterior portion narrow and tubulate, with two small 
tubercles at the middle of the anterior margin. Elytra very broad, short, compressed at the sides before 
the middle and transversely depressed at the base, the base itself sharply margined on each side of the 
scutellum ; deeply striate, the stria finely punctate, the interstices rather convex and densely punctate. 
