BACTRIDIUM. 577 
Hab. GuateMata, Cubilguitz (Champion); Panama, David (Champion). 
This peculiar insect is readily distinguished from our other species by the great 
development of the head and mandibles. Jt hasa character peculiar to itself, inasmuch 
as the coxal lines are not only detached and distinct, but are connected together behind, 
so that they enclosea shield-shaped space. ‘The colour is somewhat variable, the elytra 
being more or less indistinctly striped with red. The antenne are remarkably thick, 
the ninth joint not at all detached from those preceding it. Head thick, the genal 
prominences in the male greatly developed, the mandibles so shaped beneath as to 
form a protecting cavity for the mouth-parts; the hind angles of the head free; the 
surface rather numerously punctate, a few of the punctures on the middle confluent, so 
as to form two very short obscure lines. ‘Thorax quadrate, transversely convex, rather 
coarsely punctate, with a transverse impression behind; before this there is a short 
smooth space, in front of which the surface is very slightly depressed and more nume- 
rously punctured. The elytra are alutaceous and regularly crenate-striate. 
Eight examples. The one from Panama has the surface more shining. 
8. Bactridium eumorphum, sp.n. (Tab. XVIII. fig. 6.) 
Sat elongatum, haud depressum, ferrugineum, nitidum; prothorace sat crebre irregulariter punctato, absque 
area levigata discreta; elytris sat elongatis, subtiliter punctato-striatis. . 
Long 24-3 millim. 
Hab. Guaremata, Capetillo, Zapote, Cerro Zunil, Panajachel (Champion). 
This and the two following are readily distinguished from most of our other species 
by their more Rhizophagoid form and sculpture. Antenne short, penultimate joint not 
larger than the others. Head rather sparingly and finely punctured ; there exist small 
free angles, but only obscurely. Thorax nearly straight-sided, transversely convex, 
shining, rather finely and not densely punctured ; a few of the punctures on each side 
of the middle behind are arranged so as to form an obscure line, converging towards its 
fellow at the base, and on the area between these obscure lines the punctures are more 
sparing. ‘The elytra are elongate, a little paler in colour than the head and thorax ; 
‘their sculpture consists of fine striz, in which punctures can be distinguished. The 
male is rather broader and more deplanate than the female, and has a larger head; 
the terminal ventral segment has a rather broad impression extending the whole 
length. Thirteen specimens. 
9. Bactridium germanum, sp. n. 
Sat clongatum, angustum, haud depressum, ferrugineum, nitidum; prothorace elongato, sat crebre punctato, 
medio area angusta levigata; elytris sat elongatis, striatis, striis subtiliter punctatis. 
Long. 24-23 millim. 
Hab. Guatemata, Mirandilla (Champion). 
Closely allied to B. ewmorphum; a little narrower and less depressed, with the 
BIOL. CENTR.-AMER., Coleopt., Vol. II. Pt. 1, February 1900. 4 E* 
