58 HYDROPHILIDA. 
lata, parum elongata; femoribus ad basin sat late pubescentibus; tibiis posterioribus haud ciliatis, facie 
interna superne serie punctorum delimitata ; abdominis apice valde carinato, carine apice parum spinoso- 
producto. 
Long. 54, lat. 3 lin. 
Hab. Nicaragua, Chontales (Janson). 
This is one of a series of species in which the posterior tibie are without swimming- 
hairs, but have their smooth inner face traversed at the upper edge by a closely placed series 
of punctures, each of which bears a spine, the basal spines being coarse and depressed, 
while those at the apex are fine and erect or suberect, so as. to be like extremely short 
coarse hairs. The sternal spine is short and rather flat, projecting, however, distinctly a 
little beyond the hind margin of the basal ventral segment ; itis but little punctate; and 
its apex bears two or three minute sete. The last ventral segment is armed with a 
very strongly elevated ‘carina, the apex of which is free, however, only for a short 
distance, so that it is but little spinose. 
11. Tropisternus oculatus. (Tab. II. fig. 6.) 
Superne olivaceus eeneo tinctus, antennarum basi palpisque testaceis; pedibus rufis, femoribus basi nigra ; 
subtilius punctatus, pernitidus; oculis majoribus, valde convexis; elytrorum linea marginali subtiliter 
crenato-punctata, punctis pone humeros minutis; abdominis apice longius spinoso. 
Long. 53-6, lat. 3 lin. 
Hab. Mexico, Presidio (forrer).—Soutu America, Colombia (coll. Sharp). 
The species may be readily distinguished from all others known to me by the larger 
eyes; the colour appears to vary but little, if I may make such a statement on the 
authority of an inspection of but few examples. The ventral spine is remarkably 
elongate. The male has a slender tooth, placed near the base of the under claw on the 
middle and hind feet. In an individual labelled “Nov. Grenada,” the systematic 
punctures near the side of the thorax are not concentrated into so minute a space as 
they are in the other individuals. 
A specimen from Presidio is figured. 
12. Tropisternus fuscitarsis. 
Sat latus et convexus, posterius subattenuatus, nitidissimus, niger ; pedibus plus minusve rufo variis; crebre 
subtilius punctulatus; margine pleurali basi impunctato, pone medium angusto sed crebre punctato; 
pedibus posterioribus modice elongatis, tibiis ciliatis, femoribus ad basin area parva pubescente ; spina sternali 
sat elongata, acuminata, levigata ; abdominis apice fere mutico. 
Long. 43-53, lat. 24-3 lin, 
Hab. Muxico, Oaxaca, Jalapa (Hége), Cordova, Parada (Sallé); GuatemMaa, Guate- 
mala city 5000 feet (Champion); Nicaragua, Chontales (Janson). 
This species varies somewhat in colour, the upper surface having sometimes an 
obscure metallic reflection, and the legs being occasionally nearly entirely red; but the 
characters mentioned in the above diagnosis are distinctive when this species and 
TL. concolor are compared. 7. Suscitarsis is more elongate, has the surface a little more 
