242 The Univeksity Science Bulletin. 



the general shape of a greatlj^ flattened obtuse triangle with a rounded apex, 

 fairly regular in size, shape and spacing, those distad being very flat and in- 

 distinct, bear small; numerous secondary teeth on both cephalic and caudal 

 edges; tip notched with small teeth on both edges, not continuous around the 

 tip, twelve to thirteen present between preapical prominence and apex, area 

 of ducts granular in appearance, circular duct openings visible; open along 

 ventral apical edge, at extreme apex, along dorsal edge of toothed area, and 

 in basal portion of the valve; the two valves of the pair are joined one to the 

 other by an elongate, distinct, heavily chitinized connection present on the 

 dorsal edge at a point a little more than one-third the length of the valve ; the 

 apex is apparently strengthened by a short, narrow rod which can be seen 

 only at the extreme apex, much shorter and lighter than in M. straminca. 



Genus Scaphoideus Uhler. 



The ovipositors of two species of this genus have been examined. 

 They do not resemble each other to the degree that is common be- 

 tween two species of the same genus, though they have many points 

 in common. In each case the ovipositor is about the same width for 

 the entire length, narrows only at the apex, and bears no preapical 

 prominence. The dorsal edge bears teeth along the apical two-fifths 

 of its length, but these teeth differ in number, size, shape, and pos- 

 session of secondary teeth in the two species, the tip bears teeth in 

 one species, none in the other; the area of ducts is granular in ap- 

 pearance and the duct openings are visible. The two valves of the 

 pair are joined one to the other by an elongate, heavily chitinized 

 connection present on the dorsal edge about midway of the valve. 



Scaphoideus scalaris Van Duzee. 



(PL XXX, fig. 1.) 



Length, 1.53 mm.; greatest width, 0.13 mm. Curved basal connection nar- 

 row and rodlike, rest of valve about the same width for entire length, narrow- 

 ing only at apex; beai*s no preapical prominence; slightly curved, tip narrowed, 

 bluntly rounded at extreme apex, chitinization rather heavy ; strengthening rod 

 extends caudad almost to second dorsal tooth from apex. Toothed area on 

 dorsal edge occupies a little more than the apical two-fifths of the length; 

 teeth nine in number, rather large, broadlj^ rounded, rather irregular in size, 

 shape and spacing being farther apart basally; bear no secondary teeth; tip 

 bears no teeth, ducts granular in appearance, circular duct openings visible; 

 open along ventral apical edge, at extreme apex, along dorsal edge of toothed 

 area, and irregularly in the basal region where elongate ducts are visible; the 

 two valves of the pair are joined one to the other by an elongate, heavily 

 chitinized connection present on the dorsal edge about midway of the valve ; 

 this connection occupies a little less than a third of the entire length and bears 

 the first dorsal tooth. 



