232 The University Science Bulletin. 



occupies nearly all of broadened area or about half the total length; teeth 

 thirteen in number, rather small, in the general shape of a greatly flattened 

 obtuse triangle with the caudal side much longer than the cephalic, regular 

 in spacing; bear secondary teeth on both edges, five to eight on caudal edge 

 and one to two on cephalic edge, those on the caudal edge are much the 

 larger; tip notched with small teeth on both dorsal and ventral edges, not con- 

 tinuous around the tip, twenty present on ventral edge; ducts rather incon- 

 spicuous, though more conspicuous than in C. hieroglyphica, elongate, few in 

 number, distinctly curved; open apically, along dorsal edge in and near teeth, 

 and in face of valve back from edge. 



Genus Kolla Distant. 



The ovipositors of three species of this genus have been examined 

 and found to be similar. In each case the ovipositor consists of a 

 curved, narrow, rodhke basal attachment and a broader, flat, apical 

 shaft bearing teeth along its dorsal edge. The teeth are triangular 

 in shape and bear small secondary teeth along their caudal sides. 

 The tip is notched in each case with small teeth present on both 

 edges, but not continuous around the tip. The ducts may or may 

 not be visible; when visible they are elongate, rather straight, and 

 few in number. 



Kolla bifida (Say). 



(PI. XXII, fig. 13; pi. XXVIII, fig. 3.) 



Length, 1.5 mm.; greatest width, 0.22 mm. Basal connection narrow and 

 rodlike ; apical shaft broad, flat, narrowing gradually to the apex ; no preapical 

 prominence ; only very slightly curved beyond curved basal attachment ; apex 

 narrowed with extreme apex rounded, only lightly chitinized; strengthening 

 rod extends caudad as far as and beyond last apical tooth. Toothed area on 

 dorsal edge occupies entire length of apical shaft and more than two-thirds of 

 the entire length; teeth fourteen in number, medium in size, in the general 

 shape of a greatly flattened obtuse triangle with the caudal edge much longer 

 than the cephalic and the apex rounded, not distinctly more heavily chitinized 

 than the rest of the valve; bear small secondary teeth along the caudal edge 

 only, seven to twenty-one on each tooth; the tip is notched with small teeth 

 on both dorsal and ventral edges, not continuous around the tip, fourteen to 

 fifteen on ventral edge; ducts inconspicuous, only apices and circular open- 

 ings visible; open apically, along the doi-sal edge in and near teeth, and a few 

 in the face of the vahe back from the edge. 



Kolla geometrica (Signoret). 



(PI. XXVIII, fig. 2.) 



Length, 1.17 mm.; greatest width, 0.17 mm. Basal portion narrow and rod- 

 like; apical shaft broad, flat, tapers to apex; no preapical prominence; not 

 curved bej'ond base; tip greatly narrowed with extreme apex rounded bluntly; 

 chitinization light though somewhat heavier than in K. bifida; strengthening 

 rod extends caudad as far as last dorsal tooth. Toothed area on dorsal 

 edge occupies entire length of broadened shaft; teeth seventeen to nineteen in 



