260 The University Science Bulletin, 



Genus Balclutha Kirkaldy. 



The ovipositors of two species of this genus have been examined 

 and found to be similar. The basal portion is somewhat narrower 

 than the apical portion. The point of greatest width is between 

 three-fourths and four-fifths the length of the valve, beyond which 

 the valve tapers to a very narrow apex, sharply pointed or narrowly 

 rounded. The valve bears only very small teeth located at the apex. 

 The area of ducts may or may not be conspicuous, is granular in ap- 

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

 are joined one to the other by an elongate, lightly chitinized connec- 

 tion present on the dorsal edge of the basal area. 



Balclutha punctata (Thunberg). 



(PI. XXIV, fig. 10; pi. XXXIII, fig. 4.) 



Length, 0.88 mm.; greatest width. 0.1 mm. Apical portion somewhat wider 

 than basal portion, point of greatest width about three-fomtlis the length, tapers 

 caudad from this point to the apex; distinctly curved, tip greatly narrowed, 

 extreme apex narrowly rounded, chitinization very light; strengthening rod 

 extends caudad to within a short distance of the apex. The valve is toothed 

 only on its dorsal apical edge for about one-sixth the length, teeth numerous, 

 very small, regular; area of ducts inconspicuous, faintly granular in appear- 

 ance, duct openings visible; open along ventral apical edge, at extreme apex, 

 along dorsal apical edge, and in the basal region; the two valves of the pair are 

 joined one to the other by a lightly chitinized, elongate, narrow connection 

 present on the dorsal edge of the basal area. 



Balclutha impicta (Van Duzee). 



(PL XXIV, fig. U; pi. XXXIII, fig. 5.) 



Length, 0.88 mm.; greatest width, 0.09 mm. Apical portio'n slightly wider 

 than basal portion, point of greatest width about four-fifths the length; only 

 slightly curved, tip greatly narrowed, extreme apex very sharply pointed, chi- 

 tinization light, though heavier than in B. punctata; strengthening rod extends 

 caudad almost to apex. The dorsal edge is toothed only for the apical sixth of 

 its length; teeth numerous, very small and regular; ventral edge also bears a 

 few small teeth at the apex, farther apart than those on the dorsal edge, about 

 ten in number; area of ducts conspicuous, granular in appearance, openings 

 visible; open along ventral apical edge, at extreme apex, along dorsal apical 

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

 other by a distinct, elongate, narrow connection present on the dorsal edge of 

 the basal area. 



Eugnathodus abdominalis (Van Duzee). 



(PI. XXIV, fig. 12; pi. XXXIII, fig. 6.) 



Length, 0.72 mm.; greatest width, 0.09 mm. Apical half slightly wider than 

 basal half, point of greatest width is about three-fourths the length, beyond 

 this point the valve tapers to the apex; distinctly curved, tip greatly but 

 unevenly narrowed, extreme apex very sharply pointed, chitinization very 



