822 Mr. G. R. Waterhouse on some new genera and 
so: tarsi slender; the hindermost but little shorter than the 
tibize. 
Presternum rather narrow, with a longitudinal groove, and not 
produced posteriorly beyond the hinder margin of the anterior 
COXxe. 
In having the scutellum distinct, the eyes not crossed by the 
lateral keel of the head, the tibize Alifor m, the thorax contracted 
behind, and the clypeus rounded in front, this genus approaches 
Tentyria ; it has the head proportionately larger, the thorax more 
strongly margined at the sides, the antenne longer, and the se- 
cond joint not so distinctly shorter than the rest ; its more direct 
affinity I believe to be with Hylithus, Thinobatis, Evaniosomus and 
Melaphorus. Megalophrys evinces its affinity to these insects in 
having the eye nearly round, more convex (as compared with Ten- 
tyria), , and with the lenses very large (they appear to be positively 
larger and more distinct in the small insect, Megalophrys patago- 
nica, than in a Tentyria of at least five or six times the bulk) : the 
lateral lobes of the head, or folds which cover the base of the an- 
tenne, are more produced, and separated from the clypeus by a di- 
stinct notch in all these genera with the exception of Thinobatis. 
None of these insects have the comparatively hard wing-cases 
which we find in Tentyria and its approximate genera. The prin- 
cipal distinctive characters of the South American genera above 
alluded to, may be thus expressed :— 
I, Antenne cylindrical, the terminal joint smaller than the others. 
A. Antenne with the three basal joints equal or very nearly so; the 
head elongated ; thorax without lateral keel. 
dus, Melaphorus, Guerin. 
a. Bye minute.s..........c00.csceeeee Le {eee Solier. 
Ds, OVE NALD C: eenaaspeagrccnscensaneee 2. Evaniosomus. 
B. Antennz with the second joint shorter than the first or third, and 
the third the longest ; head as broad or broader than long ; thorax 
with a distinct lateral keel ............ Megalophrys. 
IJ. Antenne incrassated at the apex, the last joint as large, or larger than 
the penultimate. 
A. Antenne with the three basal joints nearly of equal length ; clypeus 
truncated in front; anterior tibiz short and distinetly dilated at 
PRC. DDEX. wana og ins cgabhasasoskmaspeanbees Thinobatis, Eschsch. 
B. Antenne with the second joint short, the third longer than the other 
joints; clypeus rounded in front .., Hylithus, Guerin. 
Megalophrys patagonica. Megaloph. picea; antennis pedibusque 
piceo-rufescentibus ; capite thoraceque crebre punctatis ; thorace 
subquadrato, postice angustiore, marginato, angulis anticis posti- 
cisque acutis, supra subconv exo; elytris elongato-ovatis, convexis, 
seriatim punctatis interstitiis subseriatim punctulatis ; corpore 
subtus punctato.—Long. corp. 44 lin. ; lat. 1? lin. 
In general form this insect somewhat resembles a Tagenia, but 
