256 The University Science Bulletin, 



edges with small teeth, continuous around the tip, about ten on ventral edge; 

 area of ducts inconspicuous, ducts invisible except for circular openings; open 

 along ventral apical edge (six), at extreme apex (one), along dorsal edge of 

 toothed area, and in basal area; the two valves of the pair are joined one to 

 the other by a poorly defined, elongate connection present on the dorsal edge 

 of the basal area, only slightly more heavily chitinized than the rest of the 

 basal area. 



Acinopterns angulatus Lawson. 



(PI. XXXII, fig. 2.) 



Length, 1.2 mm.; greatest width, 0.12 mm. Apical portion only slightly 

 wider than basal portion, narrows slightly caudad at apex; no distinct 

 preapical prominence present; greatly curved, tip narrowed, extreme apex 

 rounded, chitinization moderately heavy, heavier than in A. acuminatus and 

 A. viridis ; strengthening rod extends caudad as far as next to last primary 

 tooth. Toothed area on dorsal edge occupies a little more than the apical 

 third; teeth eight in number, small, rounded, regular in size and shape, some- 

 what unevenly spaced; bear secondary teeth on caudal edge, three to foiu- in 

 mmiber; the margin of valve between primary teeth is notched with small, 

 numerous, regular, secondaiy teeth; tip notched with small teeth on both 

 dorsal and ventral edges, practically continuous around the tip," about fifteen 

 on ventral edge; area of ducts conspicuous, granular in appearance, circular 

 duct openings visible; open along ventral apical edge (five to six), at ex- 

 treme apex (one), along dorsal edge of toothed area, and in basal region; the 

 two valves of the pair are joined one to the other by a distinct, elongate, 

 heavily chitinized connection present on the dorsal edge of the basal area. 



Genus Thamnotettix Zetterstedt. 



The ovipositors of two species of this genus have been examined 

 and found to be generally similar. In each case the basal half is 

 distinctly narrower than the apical half, which narrows caudad at 

 the apex and bears teeth along its dorsal edge. The primary teeth 

 differ in number, shape, and number of secondary teeth they bear 

 in the two species. The tip is notched with small teeth on both 

 edges. The area of ducts is conspicuous, granular in appearance, 

 with the duct openings visible. The two valves of the pair are 

 joined one to the other by a heavily chitinized connection present 

 on the dorsal edge of the basal area. 



Thamnotettix clitellarms (Say). 



(PI.' XXXII, fig. 5.) 



Length, 1.4 mm.; greatest width, 0.18 mm. Apical portion plainly wider 

 than basal portion, narrows caudad toward apex; bears a very small preapical 

 prominence on ventral edge; slightly curved, tip narrowed, extreme apex 

 broadly rounded, chitinization medium; strengthening rod extends caudad as 

 far as fourth dorsal tooth from apex. Toothed area on dorsal edge occupies 

 a little more than the apical half; teeth twenty to twenty-three in number, of 



