MELOIDAE. 41 1 



portion sometimes pectinate ; very rarely tliey arc armed witii a 

 tootli. 



The genus Ilornia, of tlio third sub-tribe, makes an exception 

 to nearly all of the above characters. It is an entirely anomalous 

 form, and is placed here by reason of its uncovered sternal side- 

 pieces. 



Sub-tribes may be separated as follows: — 



Front not prolonged beyond the base of the antennae ; Labrum small, 

 scarcely visible. Hokiini. 



Front prolonged ; frontal snture distinct ; labrum always distinct ; 

 Mandibles prolonged, acute ; maxillary lobes often prolonged. 



Kemogxathixi. 

 Mandibles not prolonged, usually obtuse ; 



Elytra rudimentary. Sitarixi. 



Elytra entire ; 



Antennae arcnate and thickened externally. Mylabkixi. 



Antennae straight, not clavate. Gaxtharixi. 



Sub-Tribe 1. — Iloriilii. 



Head largo, squarely truncate behind ; front without suture, 

 scarcely extending beyond the insertion of the antennae, which 

 are not very long, and not thickened towards the extremity; the 

 eves are transverse, and suln-eniform ; the mandibles extend be- 

 yond the labrum, and in some males of Horia are quite large; 

 the lobes of the maxilljB are not elongated, and the palpi are not 

 dilated; the claws of the tarsi are cleft to the base, the upper 

 portion is finely pectinate, the lower one is very slender; the 

 tarsi are clothed with stiff hairs or bristles beneath. 



Two genera occur in our fauna: — 



Head large, trapezoidal ; last joint of maxillary palpi shorter than the 



third. Horia. 



•Head moderate, triangular; last joint of maxillary palpi longer than the 



third. Tricrania. 



Of Horia one species, H. macuJafa Swed., occurs in south- 

 western Arizona, also in Mexico and S. America; it is a large 

 insect, reddish testaceous in color, with black spots on the elytra, 

 forming three transverse arcuate series, the tip is also black. 

 Three species of Tricrania are known, from the Atlantic region, 

 Colorado, and Oregon. 



27 



