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THE GENUS PANSCOPUS SCHOENHERR 

 (COLEOPTERA: CURCULIONIDAE) 



By L. L. BUCHANAN ' 

 Bureau of Entomology and Plant Quarantiiie , U. S. Department of Agriculture 



The following descriptions and synoptic keys have been prepared 

 in order that names may be available for several undescribed species 

 of Panscopus in the United States National Museum collection, in- 

 cluding two submitted for identification by W. W. Baker, of the 

 Division of Truck Crop and Garden Insect Investigations, United 

 States Bureau of Entomology and Plant Quarantine. 



Panscopus may be briefly characterized as a group of North 

 American scarred-snout weevils with a prothoracic ocular lobe and 

 a rounded to narrowly elliptic scale in each serial puncture of the 

 elytra. The shape of the serial scale varies considerably, but in only 

 one species {altcr'natus Schaefifer) does it become hairlike. In one 

 subgenus {Para panscopus) there is a well-defined double row of 

 spines at the apex of the hind tibiae enclosing an oblique, narrowly 

 fusiform, subglabrous area (corbellary plate, fig. 2, a). All the species 

 are flightless, and some of them doubtless are in the nature of geo- 

 graphic forms ; but their exact status cannot be determined with 

 certainty at present. The rostral length of the descriptions is the 

 straight-line distance between the tips of the closed mandibles and 

 the point where the upper surface of the rostrum meets the globular 

 basal portion of the head. The terms anterior, posterior, dorsal, and 

 ventral, as applied to the surfaces and edges of the leg segments, 

 indicate the relative positions that would be assumed by these surfaces 

 if the leg were extended in a straight horizontal line at right angles to 

 the longitudinal axis of the body. 



KEY TO SUBGENERA OF PANSCOPUS 



I. Mentum with a single setigerous puncture each side of middle (rarely two) ; 

 metepistenial suture invisible (fused with metasternum) ; rostrum above 

 with a scale-covered, sometimes feeble, median carina in about basal two- 

 thirds ; species east of looth meridian 2. 



^ This is the third contribution to be published by the Smithsonian Institution 

 under the Thomas Lincoln Casey Fund. 



Smithsonian Miscellaneous Collections, Vol. 94, No. 16 



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