62 INSECTA. 
linear, with the thorax nearly square, and not narrowed posteriorly, 
form two subgenera. 
SrENoTRACHEEUs.—Dryoprs, Payk. 
Where the head is elongated, and narrowed posteriorly almost in 
the manner of a neck; the antenne are abruptly terminated by three 
joints, shorter and somewhat thicker than the rest; the third is 
much longer than the following ones *. 
Srroneyiuium, Airb.—Srenocuia, eyusd.—Hexors, Fab. 
Where the head is neither elongated nor narrowed posteriorly, and 
the last joints of the antennzee—somewhat more dilated—do not sud- 
denly differ from the preceding ones; the third is merely somewhat 
longer than the following one f. 
Those, in which the body is flattened, and the thorax narrowed 
posteriorly almost in the form of a truncated heart, compose the last 
subgenus, that of 
Pytrno, Lat,. Fab., 
Where the antenne hardly enlarge towards the extremity, or are 
filiform, with the last joint almost conical; the third is hardly longer 
than the preceding and following ones. 
Certain species peculiar to Brazil closely approach Pytho; but 
the second joint is much shorter than the third, and the angles of 
the thorax are acute, instead of being rounded or obtuse as in that 
genus f. 
The second tribe, that of the CrsTEtrpxs, is very closely allied 
indeed to the first, but the insertion of the antennz is not covered, 
the mandibles terminate in an entire or unemarginate point, and the 
hooks of the tarsi are pectinated inferiorly, Several of these Insects 
live on flowers. The digestive canal is shorter than in Helops, and 
the chylific ventricle presents no papille. 
This tribe forms the genus 
CisteLa, Fab. 
In some, all the joints of the tarsi are entire. The last of the max- 
illary palpi is merely somewhat larger, and obconical or triangular. 
* Dryops enna, Payk.; Calopus a@neus, Gyll.: Gidemera anea, Oliv. The Agna- 
thus decoratus of Germar—Faun. Insect. Europ., fascic. XII, fig. 4—a specimen of 
which I found near Brives, appears to me to approximate closely to the Stenotra- 
cheles. The Pelmatopis Hummelii, Fisch,—Entom. Imp. Russ., II, xxii, 7—is, I 
presume, congeneric and closely approaches the first species. 
N.B. Pelmatopus. M. Fischer, who at first thus designated this genus in his 
plates, has, in the text, adopted the name of Scoropss, previously given to it by 
M. Eschscholtz. 
{ Strongylium chalconatum, Kirb., Lin. Trans., XII, xxi, 16:—Stenochia rufipes, 
Ib., xxii, 5. See also the Helops splendidus, aurichalceus, azureus, interstitialis, flavi- 
crus, luteicornis, limbatus, of Germar. 
} See Fab., System. Eleuth., II, p. 95; Lat. Gener. Crust. et Insect., II, p. 
195; Schenh., Synon. Insect., IJ, iii, p.55; Frisch,, Entom. Imp. Russ., I, xxii, 1. 
