DIESTOTA. 253 
fifth each about as long as broad, of fifth to tenth each is slightly broader than its pre- 
decessor, so that the tenth is rather strongly transverse; terminal joint large and stout, 
quite as long as the two preceding together. Head broad and short, a good deal narrower 
than the elytra, very dull, densely and indistinctly punctate. Thorax strongly transverse, 
narrower than the elytra, straight at the sides, hind angles indistinct; surface densely 
and obsoletely punctate, extremely dull. FElytra longer than the thorax, very densely 
punctate, the sculpture not so obsolete as that of the thorax. Hind body with the 
basal segments deeply transversely depressed, only very feebly punctate. Legs dark, the 
the tarsi pale, the front tibie also pale, and the other tibize more dilute in colour at the 
base and apex. 
This insect has very much the facies of the species of Silusa ; but the middle coxe are 
very widely separated, and the mesosternal process is extremely short and broad with 
quite broad straight extremity; so I have placed it in Diestota. I have seen three 
individuals ; one of them is a male, and has the hind margin of the seventh dorsal plate 
finely crenulate, and at each side provided with a very slender spine. 
14, Diestota convexa. 
Convexiuscula, nigra, antennarum basi pedibusque rufis; prothorace valde transverso, convexo, angulis 
posterioribus rectis, basi in medio impressa ; abdomine irregulariter punctato, segmentis secundo et tertio 
ad basin profunde transversim depressis. 
Long. 3 millim. 
Hab. Guaremata, Teleman (Champion); Panama, Bugaba 800 to 1500 feet 
(Champion). ° 
Antenne short and stout, much thickened outwardly ; third joint about equal to the 
second ; fourth about as long as broad; from the fifth to tenth, each is broader than 
its predecessor, the fifth evidently, the tenth strongly transverse ; terminal joint thick, 
elongate, longer than the two preceding together. Head narrow, only about half as 
broad as the elytra, obsoletely punctate. Thorax very short and broad, a little narrowed 
towards the front; the base in the middle somewhat lobed, and deeply transversely 
impressed; the hind angles distinct and rectangular, the surface extremely finely 
punctate. Elytra longer than the thorax, coarsely and closely punctate. Hind body 
convex beneath, the second and third segments each very deeply transversely impressed 
at the base, and with crenulations in the depression, elsewhere sparingly and rather 
finely punctate, but with a distinct pubescence. 
This is a peculiar species, readily recognized by the depressions on the hind body 
and by the form of the thorax. Only two specimens have been found. In the male 
the sixth dorsal plate has a longitudinal carina on the middle; the hind margin of 
the seventh segment is closely crenulate, and has a very short tooth on each side. 
