AMERICAN COLEOPTERA. 149 



more or less curved near the base as in Agra. It is difficult in many of 

 the genera to say how many joints are truly pubescent as the hairs extend 

 nearly to the base of the first joint. 



The head assumes three forms, the first is that typified by Galerita in 

 which the head is elongate-oval, considerably prolonged behind the eyes 

 then constricted to a very narrow neck which dilates to a semiglobular 

 condyle, the second is the Zuphium type where there is a moderate pro- 

 longation behind the eye and then very suddenly constricted to a narrow 

 neck which is cylindrical, while in Drypta the constriction is close to the 

 eyes, not abrupt and the neck rather stout and cylindrical. The latter 

 genus is further remarkable in having the setae of the clypeus entirely 

 wanting, their function being replaced by those of outer side of the 

 labrum which ac([uire an unuBual development, a similar occurrence has 

 been observed in Pelecium. 



This tribe through Galerita and Stenochila shows a relationship well 

 marked with the Odacanthini, and by Thalpius to the Helluonini through 

 Folyatichus which must be placed in the latter tribe. 



Our genera are not numerous and may be known by the characters 

 of the following table : 



Neck very narrow. 



Head prolonged behind the eyes, neck inserted in thorax by a semiglobular 



condyle. Clypeus with two setigerous punctures each side Galerita. 



Head triangular scarcely prolonged behind the eyes, very suddenly constricted 

 to a narrow cylindrical neck. Clypeus with but one setigerous puncture on 



each side with a long seta Zii|> Ilium. 



Neck stout, head very little constricted. 



Thorax truncate at base, antennae with third joint shorter than the fourth. 



Diapliurus. 

 Thorax subpedunculate at base, antennse with joints 2—4 nearly equal. 



Thalpius. 



The above genera are represented on both sides of the continent. 



Tribe XXXI.— Mormolycini. 



Antennse slender, nearly as long as the body, the base exposed, four basal joints 

 glabrous, the following densely punctured and very finely pubescent, first joint 

 elongate pyriform, second short, third as long as the head, fourth a little shorter, 

 5—11 much shorter, subequal. Head very long behind the eyes, forming a flat- 

 tened neck which is moderately constricted at base and expanded semiglobularly 

 at its insertion in the thorax, front with two small supra-orbital setae. Clypeus 

 moderately prolonged, feebly emarginate, a setigerous puncture each side. Eyes 

 round, moderately prominent, distant beneath from the buccal fissure. Labrum 

 nearly square, feebly emarginate and sexsetose in front. Mandibles stout, arcuate, 

 tip acute, a small tooth at middle on the right side, near apex on the left, outer 

 side concave at base, without setigerous puncture, upper side with a short but deep 

 cicatrix-like fissure at the end of the carina. Maxillae moderately short, hooked 

 at tip, inner edge densely ciliate, outer lobe slender, biarticulate, the palpi stout, 



(33j 



