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ART. XX. — Cnjptocephalinarum Boreali-americae diagnoses cum speciehus novis 

 musei kconiiani. Auctore S. S. Haldeman. 



An examination of the North American species of Cryptocephalus and Pachijbrachis 

 seems to indicate that the characters which are usually regarded as of generic value, 

 are subject to considerable variation, and to some difficulty in the application. 

 Several additional sections are here proposed, chiefly because the species cannot be 

 placed in the former genera ; but as it will be necessary to examine a much laro-er 

 number of species, including both sexes, before this sub-family can be placed upon a 

 permanent generic basis, several of the sections are allowed to remain in the old 

 genus Cryptocephalus, instead of being provided with distinct names. The genus 

 Chlamys would have been included in this paper, had it not been already 

 monographed by Lacordaire in the second volume of his large work on the 

 Phytophaga. 



Caput deflexum, fronte plana, antennis distantibus : abdomen basi utrinque 

 prolongatum, epimeris metathoracis amplectens, articulo ultimo majore : tarsi 

 unguiculis simplicibus, vel appendiculatis : coxae anticae distantes. 



§1. Prosterno lato, bisulcato, postice angulato, rotundato-acuminato, - - GRiBURius|Lec. 



2. Prosterno sulcato, _.--.-_-_- Pachybrachys. 



3. Prosterno postice dentibus 2 longis armato, (Crypt. G — h.) - _ - Canthostethus. 



4. Prosterno piano, lato, -_-----_-- Cryptocephalus. 



5. Thorace pone oculos acute lobato % 9 ; prosterno maris cornu compresso 



inter coxas, coxis posticis % perlongis, apice spiniferis, _ - _ - Bassareus. 



6. Thorace maris non lobato, prosterno % cornu compresso ante coxas, 

 coxisque % posticis spiniferis, (C. formosiis.) 



7. Prosterno spina acuta inter coxas % 9 (C. amatus, recurvus.) 



8. Thorace pone oculos late lobato, lobo brevissimo, truncate, (C. sulphuripennis.) OdoxtoderusjCAu.? 



In the European genus Stylosomus Suffrian, 1847. Lin, ent. 2,8; the scutellum 

 is not apparent, 



GRIBURIUS Hald. 



1. C. scuTELLARis F. 2,54 :72. Niger, antennarum basi, capitis maculis, 

 thoracis margine maculis 2 basalibus, lineaque antica, scutello, elytrorum macula 

 transversa marginali ad medium apice, pygidio macula magna laterali, abdominis 

 maro-ine pedibusque^ayf^ ; pronoto sparsim subtilius punctate, basi utrinque oblique 

 impresso : elytris punctato striatis, apice fere laevibus. Long. 2i lin. 



