CHAROXUS.—TACHYUSA. 225 
is the true ally of Charoxus, and that by this genus it is connected in a satisfactory 
manner with the Myrmedoniates. The maxillary lobes are elongate; and their palpi 
differ little from the ordinary Aleochariniform type, the terminal joint being very 
slender in proportion to the penultimate joint, which, however, is not dilated, but 
slightly more slender and much longer than the preceding. The eyes are placed quite 
at the base of the mandibles; and the antenne are inserted at the front of their inner 
margin. ‘The anterior tarsi are very slender and are four-jointed; the front tibie are 
densely armed externally with coarse spines. The middle cox are moderately sepa- 
rated ; and the mesosternum is produced between them, as is also the metasternum ; the 
extremity of the mesosternal process is truncate, and does not quite touch the meta- 
sternal prolongation, the two being separated, just at about the middle of the length of 
the coxee, by a very short intercoxal isthmus. ‘The middle tibiz are very slender; and 
though in comparison with the front ones they may be said to be unarmed, yet they 
really bear on their outer edge a series of very fine rather long spines. The hind tibiee 
are quite without spines; their tarsi are very slender and about as long as the tibie ; 
they are five-jointed, the four basal joints being subequal in length, the fifth distinctly 
but not greatly longer than any of the others. 
1, Charoxus fodiens. (Tab. VI. fig. 4.) 
Elongatus, subparallelus, haud depressus, glaber, nitidus, testaceus, elytris ad latera posterius, abdomine ante 
apicem antennisque fuscis, his basi rufo-testacea, capite brunneo; prothorace elongato, parallelo, trans- 
versim convexo, basi rotundata, sparsim punctato; elytris quam hic paulo longioribus. 
Long. 3} millim. 
Hab. Panama, Volcan de Chiriqui 4000 to 6000 feet (Champion). 
Antenne short and extremely stout, even the fourth joint, though much narrower 
than those following, is transverse, the fifth to tenth are very strongly transverse, terminal 
joint not acuminate. Head elongate, coarsely punctate. Prothorax straight at the 
sides, very convex transversely, longer than broad, shining, very sparingly punctate. 
Elytra and hind body almost impunctate. 
The only individual found is immature and in very fragile condition, so that its 
examination, even in an imperfect manner, has been difficult. 
TACHYUSA. 
Tachyusa, Erichson, Kif. Mark. i. p. 307; Gen. et Spec. p.69; Rey, Col. Fr., Brév. Myr. ii. p. 380. 
This genus possesses about twenty species in the European region ; and four species 
from North America and two from Chili are supposed to belong to it. The South- 
American 7. picticornis and T. extranea, Sharp, must be removed from the genus and 
placed in Myrmedonia. 
BIOL. CENTR.-AMER., Coleopt., Vol. I. Pt. 2, Judy 1883. 2GG 
