AMERICAN COLEOPTERA. 135 



Tribe XXIII.— Pogonini. 



AntennfE slender arising under a feeble frontal ridge, the third joint usually 

 very little longer than the second, the first two joints only glabrous. Head some- 

 times constricted behind the eyes, two supra-orbital setse. Eyes (sometimes absent), 

 rarely prominent, distant beneath from the mouth. Clypeus moderately prolonged 

 and with a setigerous puncture each side. Labrum short, truncate or broadly 

 emarginate, plurisetose in front. Mandibles moderately prominent, feebly arcuate, 

 acute at tip and with a setigerous puncture on the outer side. Maxillse slender, 

 acute at tip, ciliate with a few stiff hairs inside, the outer lobe biarticulate, palpi 

 moderate or long, the terminal joint variable but hot subulate, the penultimate 

 joint not pubescent. Mentum broad, its basal suture often obsolete, deeply emar- 

 ginate and toothed, the tooth bifid or simple, the epilobes often dentiform, ligula 

 moderately prominent, usually broad the tip free and arcuate, uni- or bisetose 

 {Pogoni) or even plurisetose (Trechi), the paraglossije slender, very little longer 

 than the ligula and not ciliate within [Pogoni) or slender, long and ciliate within 

 at tip [Trechi), the palpi slightly variable the last joint not subulate. Thorax 

 with a seta at the sides and at hind angle. Body not pedunculaie, scutellum 

 distinct. Elytra sometimes margined at base, sides narrowly inflexed, margin 

 posteriorly entire or with a very feeble sinuation and without internal plica, disc 

 more or less striate, dorsal punctures distinct. Prosternum not prolonged at tip. 

 Mesosternum declivous in front, moderately separating the coxse, the epimera 

 narrow. Metasternum variable in length, the epimera distinct, the posterior coxae 

 contiguous. Legs moderate or slender, the tibiae not spinulose externally, the 

 anterior deeply emarginate within the inner spur remote from the apex. Tarsi 

 slender, claws simple. 



The anterior tarsi of the males have two joints dilated and squamulose beneath. 

 As above constituted the tribe contains in our launa two <;roii])t^, 

 separated in the following manner : 



Terminal joint of palpi more or less cylindrical and obtuse at tip, that of the 



labial palpi as long as the preceding Pogoni. 



Terminal joint of palpi slender, acute at tij), that of the labial pal])i shorter than 



the preceding TiiKcni. 



In addition to the above characters the form of the paraglossas 

 and the setae of the ligula add some weight to the separation of 

 the two groups. 



The group Pogoni contains in our fauna two genera : 



Head more or less constricted behind the eyes or transversely impressed. Elytra 

 not margined at base l*atrobus. 



Head not constricted behind the eyes. Elytra usually margined at base. 



I'OgOIIUM. 



This group has been the subject of a special essay by Baron Chaudoir, 

 (Ann. Belg. xiv, pp. 21 — 61), in which he divides the species of the 

 former genus in our fauna into two genera Patrohus and P/(ttidius, and 

 the latter into Pogomis, Foyonistes and Diplochsefus. I have given 

 elsewhere a review of our genera and species in which will be found 

 my reasons for not adopting the genera suggested by Chaudoir, ( Trans. 

 Am. Ent. Soo. v. pp. 180 and 248). 



