The Genus Scaphoideus. 



any record of food plant is given include Crataegus, oak, grape, 

 spice bush, witch hazel, etc., but in very few cases have food 

 plants been carefully determined, especially for the larvse. 



I have had for study collections from the National Mu- 

 seum, the Iowa State College, and some fine series of speci- 

 mens from Mr. K. D. Ball, Mr. E. P. Van Duzee, Mr. Otto 

 Heideman, and Prof. R. H. Pettit, for all of which I take the 

 opportunity to express my obligations. This, with the 

 material in my own and the Ohio State University collections, 

 forms an aggregation of several hundred specimens. 



The genus is strictly American, and the more typical 

 members, immistus and allies, are found mainly east of the 

 Rocky Mountains; scalaris and allies cover a wider range, 

 and with fasciatus extends the range of the genus into 

 subtropical region. 



Synopsis of the Species. 

 A Lorae remote from the margin of the cheeks; common elytral 

 picture cruciate; claval vein straight, meeting suture at acute 

 angle. 



a Face with two dark fasciae, beside frontal arcs, vertex obtuse. 



b Length 4mm. vertex obtuse fasciatus n. sp. 



bb Length 5mm. vertex subacute sanctus Say 



aa Face yellow without cross bands, vertex acute. . . .picturatus Osb. 

 AA Lorae contiguous to, or merging with, border of cheeks, elytral 

 picture not cruciate, outer claval vein curved or hooked at 

 distal end. 



a post nodal cell slightly widened posteriorly, outer ante-apical cell 

 with nearly parallel sides, nodal vein or veins not reflexed. 

 b Post-nodal cell without cross veins, $ plates prolonged into long 

 flaccid or filamentous tips. 



c Nodal vein arising from discal cell auronitens Prov. 



cc Nodal vein arising from ante-apical cell. 

 d Vertex flat with transverse impressed line, 



edges acute jucundus Uhl. 



/ dd Vertex convex, no impressed line, edges rounded. 



e Vertex wider than long, obtuse or rounded. 



f Vertex sub-acute, size large consors Uhl. 



ff Vertex obtuse or rounded, size small, .mexicanus n. sp. 

 ee Vertex as long or longer than wide, acute, .scalaris Van D. 

 bb Post-nodal and costal cells with cross veinlets, elytra with 



numerous ramose lines in the cells lobatus Van D. 



aa Post -nodal cell much widened at distal end, outer anteapical 

 narrowed posteriorly acute or stylate, $ plates not prolonged in 

 flaccid tips. 



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