. Classification of the Coleoptera of North America [microform]. Beetles; Beetles; Coléoptères; Coléoptères. UI8TEKIDAE. 73 Fam. XLâHISTERIDAE. Mentum corneous, sometimes large and covering the base of the maxilla), flat or slightly concave, subquadrate, some- times emarginate or tridentato in front; ligula almost con- cealed behind the mentum; palpi 3 jointed, cylindrical. Maxillas with two ciliated lobes, the internal one much smaller; palpi 4-jointed, cylindrical. Antenna) geniculate, capable of being retracted, short, in the second sub-family with the first joint thick, but in the firs
. Classification of the Coleoptera of North America [microform]. Beetles; Beetles; Coléoptères; Coléoptères. UI8TEKIDAE. 73 Fam. XLâHISTERIDAE. Mentum corneous, sometimes large and covering the base of the maxilla), flat or slightly concave, subquadrate, some- times emarginate or tridentato in front; ligula almost con- cealed behind the mentum; palpi 3 jointed, cylindrical. Maxillas with two ciliated lobes, the internal one much smaller; palpi 4-jointed, cylindrical. Antenna) geniculate, capable of being retracted, short, in the second sub-family with the first joint thick, but in the first with the first joint long, the eighth and following ones forming a compact, annulated, rounded, or (rarely) triangular club. Prothorax closely applied to the elytra; side pieces not distinct;* in most of the genera with two cavities to receive the club of the antennae; prosternum frequently lobed in front, produced behind, articulating with the mesosternum; coxal cavities open behind. Mesosternum separating widely the middle coxae; side pieces large, not divided, sometimes visible from above. Metasternum very large, almost connate with the meso- sternum anteriorly; episterna sometimes narrow, sometimes broad, occasionally curved; epimera broad, large, separated by a fine suture, which is sometimes effaced. Elytra truncate behind, leaving two segments of the ab- domen uncovered; scutellum small in the first sub-family, entire in the second. Abdomen with five free ventral segments, the first very large, the fifth very short, closely applied to the lasi. dorsal segment, which is triangular and deflexed. Anterior coxae transverse and not prominent in the first sub-family, globose in the second; middle and posterior coxaa widely separated, not prominent, rounded, or rather sub- quadrate, the latter not extending to the sides of the body. Legs short, retractile; tibito compressed, anterior ones usually toothed, posterior sometimes toothed; spurs distinct, those of the ante
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Keywords: ., bookauthorlecontejohnljohnlawre, bookcentury1800, bookdecade1860
