472 1NSECTA. 



Strongylium, Kirb. Stenochia, ejusd. Helops, Fab. 



Where the head is neither elongated nor narrowed posteriorly, and 

 the last joints of the antennae somewhat more dilated do not sud- 

 denly differ from the preceding ones; the third is merely somewhat 

 longer than the following one(l). 



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 



Pytho, Lat. Fab. 



Where the antennse 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(2). 



The second tribe, that of the Cistelides, is very closely 

 allied indeed to the first, but the insertion of the antennse is 

 not covered, the mandibles terminate in an entire or une- 

 marginate point and the hooks of the tarsi are pectinated infe- 

 riorly. Several of these Insects live on flowers. The diges- 

 tive canal is shorter than in Helops, and the chylific ventricle 

 presents no papillae. 



This tribe forms the genus 



Cistela, Fab. 

 In some, all the joints of the tarsi are entire. The last of the max- 



men of which I found near Brives, appears to me to approximate closely to the 

 Stenotracheles. The Pdmatopis Ilummelll, Fisch. Entom. Imp. Russ., II, xxii, 

 7 is, I presume, congeneric and closely approaches the first species. 



N.I3. Pelmatopus. M. Fischer, who at first thus designated this genus in his 

 plates, has, in the text, adopted the name of Scotodes, previously given to it by 

 M. Eschscholtz. 



(1) Strongylium chalconatum, Kirb., Lin. Trans., XII, xxi, 16; Stenochia ru- 

 Jipes, lb., xxii, 5. See also the Helop-s splendldus, aurichalceus, azureus, interstitia- 



lis,jlavlcrus, lutelcornis, limbatus, of Germar. 



(2) See Fab., System. Eleuth., II, p. 95; Lat. Gener. Crust, et Insect., II, p. 

 195; Schumh., Synon. Insect., I, iii, p. 55, Frisch., Entom. Imp. Kuss., II, xxii, 1. 



