. Smithsonian miscellaneous collections. short distancebefore the middle of the pronotum, occur many comparatively smalland low serrations arranged in concentric rows and decreasing in sizetowards the summit. Behind the summit the surface of the i)r()notumis covered with punctures. There are two kinds of punctures; theone comparatively coarse in contrast to the other but fine comparedto those in other nearly related genera; the other, minute and only 3 32 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 82 visible under higher magnification. The coarser punctures are sparse,deep and distinct, the mi
. Smithsonian miscellaneous collections. short distancebefore the middle of the pronotum, occur many comparatively smalland low serrations arranged in concentric rows and decreasing in sizetowards the summit. Behind the summit the surface of the i)r()notumis covered with punctures. There are two kinds of punctures; theone comparatively coarse in contrast to the other but fine comparedto those in other nearly related genera; the other, minute and only 3 32 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 82 visible under higher magnification. The coarser punctures are sparse,deep and distinct, the minute ones closely placed giving this part ofthe pronotum a more opaque appearance. The posterior margin isslightly arcuate. Immediately anterior to the posterior margin thereis an impressed line giving the intermediate space the appearance ofa low ridge. This raised margin served as one of the main charactersin placing this genus near Pityophthorus and allied genera. The pro-notum is covered with inconspicuous hairs which are longer and. Fig. 14.—Gnathotrichus sulcatus Lee.: Prothoiax, ventral aspect. a, anterior foramen; b, posterior foramen; c, anterior margin of pronotum; d, posteriormargin of pronotum; CxC, coxal cavities; Epm, epimeral area; Eps, episternal area; process; Peps, preepisternal area; Pst, poststernal area; St, sternal area; T,tergum or pronotum. coarser anteriorly. Posterior to the summit occurs a shallow trans-verse impression. The lateral limitations of the pronotum are notclearly defined Init near the postero-lateral angle is a longitudinal ridgewhich may be considered as a remainder of the pleuro-notal suture. Pleural area.—^The propleural area (fig. 14) is represented as onecontinuous plate in the shape of a trapezium of which the base isformed by the remainders of the pleuro-notal suture. Ventrally thepleural area is completely fused with the prosternum (St). Externallyno sufficiently distinct lines are present to justify the distinct
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Keywords: ., bookauthorsm, bookcentury1800, bookdecade1860, booksubjectscience
