GYROPHANA. 261 
humeral spot ; with a few granules, especially near the suture, in the male, and a very 
few punctures in the female. 
The dorsal plate of the seventh segment is formed much as in G. pollens, except that 
the projections are rather longer, and the central lobe is flatter and more truncate at 
the extremity and reaches as far back as the lateral teeth. In the female the corre- 
sponding part is quadridentate, as in G. pollens, but the teeth are longer, the lateral 
ones more convergent, and the middle pair reach nearly as far back as those at the 
sides. 
Like G. pollens, the specimens show variation in the colour of the hind body; but in 
none of them is it black. 
14. Gyrophena miranda. 
Convexa, nitidula, haud pubescens, picea, antennis fulvis, basi, pedibus, elytrorumque humeris testaceis; an- 
tennis articulo quarto parvo, 4°-10™ haud transversis ; prothorace quadripunctato ; abdomine picescente 
vel rufo. 
Long. 34 millim. 
Hab. Mexico, Toxpam and Cordova (Sallé); GuaTEMALA, Zapote (Champion); Nica- 
RaGua, Chontales (Janson); Panama, David (Champion). 
This insect is extremely similar to G. humeralis, and, in fact, differs only by the sexual 
characters. These in the male are very similar to those of G. humeralis ; but the tubercles 
on the elytra are rougher, and the middle lobe of the seventh dorsal plate is broader 
and is more distinctly (but still only slightly) emarginate behind. The females of the 
two species are, on the contrary, very distinct: in G. miranda the elytra are tuberculate, 
though less coarsely than in the male, and the middle of the seventh dorsal plate forms 
a large triangular projection, the apex of which is divided by a short and narrow 
fissure; on each side there is an elongate spine directed much inwards, so that it runs 
nearly parallel with the side of the triangular projection, and has the same length. 
The Amazonian G. convera was described by me from a single individual, supposed 
on account of its remarkable sexual peculiarities to be a male; but the discovery of 
the two sexes of G. miranda indicates that the Amazonian individual is a female. It 
is indeed excessively closely allied to G. miranda, but shows some slight differences in 
the sexual characters, the chief of which are that in each sex it possesses a kind 
of canaliculation along the middle of the seventh dorsal plate, and that the notch 
dividing the apex of the middle lobe of the female is about twice as long as it is in 
G. miranda. 
Of G. miranda I have seen two Mexican specimens, which differ very slightly from 
the typical or Central-American form, fourteen specimens from Zapote, one from Panama, 
and three from Nicaragua. Of these latter two are entirely ferruginous in colour, but 
do not differ in other respects. 
