PLATYGERRIS.—TREPOBATOPSIS, 157 
somewhat twisted on the right side posteriorly, and there produced into a very long 
spiniform process, and the second genital dorsal segment is armed on the same side at 
the base beneath (the left side as seen from above) with a very long,*acute, slightly 
curved spine. The three males seen agree precisely in this respect. 
2. Platygerris ceruleus, n. sp. (Tab. 1X. fig. 25, 2.) 
Winged form. 2. Broad, parallel; black, the head, the anterior lobe of the pronotum, the metanotum, pleura, 
and legs with a greenish or bluish-green lustre, the rest of the pronotum nigro-ceruleous; the head with 
an oval spot between the eyes and the pronotum with a median line on the anterior lobe fulvous; the 
anterior femora at the base beneath, the intermediate and hind cox beneath, a spot on the underside of 
the ante-coxal pieces of the meso- and metapleura, the prosternum, and venter ochraceous; the elytra and 
wings smoky-brown; the under surface and pleura thickly clothed with short silvery pubescence, the 
pronotum and legs with greyish pubescence, the anterior femora with a few long hairs on the lower edge ; 
the head, pronotum, and mesonotum shining, the pleura and under surface opaque. Antenne with joint 1 
very elongate, about three times as long as 2 (3 and 4 broken off). Pronotum gradually widening 
posteriorly, rounded behind, leaving the metanotum exposed, sharply separated laterally from the meso- 
pleura, the hind angles tumid, the anterior lobe broadly depressed in the middle. Mesopleura broad and 
parallel. Elytra as long as the entire body, and about one-third longer than the wings. Anterior femora 
stout, a little shorter than the tibia, the latter considerably produced at the apex within. Posterior 
femora longer than the intermediate femora, the intermediate tibie not half the length of the femora of 
the same pair of legs. Terminal ventral segment with a broad, transverse, vertical, upwardly directed 
plate at the apex, covering the genital segments. 
Length 8, to tip of the elytra 12, breadth 3} millim. 
Hab. Costa Rica, Irazu (Rogers). 
One specimen. Larger and more parallel than P. depressus, with a more elongate 
basal joint to the antenne, and very differently formed terminal ventral segment. 
TREPOBATOPSIS, n. gen. 
Head very broad, short, convex, produced and declivous in front, angularly dilated on each side above the 
insertion of the antennex, broadly emarginate behind for the reception of the pronotum; the eyes finely 
faceted, large, oblique, and widely separated; rostrum short, reaching the front of the mesosternum ; 
antenne nearly as long as the body (exclusive of the genital segments), 4-jointed, 1 very elongate, curved 
at the base, longer than the others united, 2 and 3(¢) furnished with dentiform processes at the apex 
beneath. Pronotum very short, much narrower than the head (with the eyes), subtruncate in front and 
behind, rounded at the sides, and depressed in the middle; the propleura vertical, narrowing downwards, 
and not visible from above. Mesonotum trapezoidal, sinuate at the sides, and trisinuate behind, not 
distinctly separated laterally from the pleura; the latter very broad, rounded at the sides in front, 
extending forwards as far as the eyes and backwards to beneath the metapleura. Metanotum with a 
deep oblique groove on each side; metapleura broad, extending backwards to as far as the apex of the’ 
second dorsal abdominal segment. Abdomen very short, with moderately broad, flattened connexivum, 
the six segments united shorter than the mesonotum; first genital segment ( ¢) very broad, parallel, as 
long as the three preceding segments united, covering two small terminal segments, which are not visible 
from above. Anterior coxe narrowly separated, the ante-coxal pieces received in the cavity beneath the 
eyes; anterior femora ( 3 ) slender, about one-third longer than the tibia, armed with a stout tooth on the 
lower edge; anterior tibie armed with a strong curved tooth at the inner apical angle; anterior tarsi 
2-jointed, about half the length of the tibia, joint 1 short, 2 about three times as long as 1, with the two 
claws inserted at about the middle beneath. Intermediate femora a little stouter than, and about two 
thirds the length of, the posterior femora; the latter extremely elongate, and nearly three times the 
length of the tibiz of the same pair of legs. Mesosternum separated from the mesopleura by a welle 
defined groove, which extends forwards to beyond the middle. Body short, broad, depressed, apterous. 
