ArT. 8. BUPRESTID BEETLES OF MEXICO—FISHER. 93 
finely and densely reticulate-striolate; last segment broadly rounded 
posteriorly, with two sharp, widely separated spines at the apex. 
Prosternum finely transversely striolate anteriorly; prosternal proc- 
ess nearly smooth, with a few widely separated punctures. 
Length, 4.75 mm.; width, 2.75 mm. 
Type locality —Trinidad River, Panama. 
Type.—Cat. No. 25132, U.S.N.M. 
Described from a unique specimen collected at Trinidad River 
Panama, June 2, 1912, by August Busck. 
Tribe MASTOGENINI LeConte and Horn. 
Mastogenini LeConre and Hory, Classification of the Coleoptera of North Amer- 
ica, Smiths. Misc. Coll., vol. 26, No. 507, 1883, pp. 199-200. 
This is a very small tribe and contains only five described genera, 
two of which have been found within the area covered by the 
present paper. All of the known genera are included in the key, 
since Micrasta described by Kerremans from Brazil, and Trigonogya 
described by Schaeffer for a single species from Brownsville, Texas, 
may be found in Mexico and Central America in the near future. ‘The 
genus Ankareus was erected by Kerremans for a number of species 
found in Madagascar. 
The species of this group have the body somewhat cylindrical, 
nearly parallel, and scarcely narrowed behind. The front of the head 
is rather strongly narrowed by the insertion of the antennae; antennal 
cavities large and situated a certain distance from the eyes; base of 
pronotum truncate; sternal cavities for the insertion of the prosternal 
process, formed entirely within the metasternum, the mesasternum 
being scarcely visible; hind coxae scarcely dilated internally; tarsal 
claws broadly toothed. 
So far, very little is known about the habits of any of the species 
of this group. Burke® records Mastogenius as a twig-borer in fire- 
killed saplings of Spanish oak (Quercus digitata) in the Southern 
States, but none of the larvae were collected. 
KEY TO THE GENERA. 
1. Prosternum with distinct antennal cavities, and a carina on each side of middle. 
Trigonogya Schaeffer. 
Prosternum without antennal cavities or carina at middle.............---.-. 2 
2. Eyes a little oblique, slightly converging on the occiput.........------------ 3 
LOK ecto fe Pe AOR, ee ee ee ae a ee See iy Sets eo eee er 4 
3. Antennae serrate from the fourth joint ..........-.......-- Mastogenius Solier. 
Antennae serrate from the third joint .......-..-.-...-.-. Ankareus Kerremans. 
4, Antennae with the serrate joints triangular ............--- Micrasta Kerremans. 
Antennae with the joints elongate, and scarcely serrate on the inner side. 
Exaesthetus Waterhouse. 
°U. 8, Dept. Agri., Bull. No. 437, 1917, p. 7. 
