BALCLUTHA — BLOCKER 



51 



longer than style, stem and arms approximately equal in length; style 

 with preapical lobe rounded, apical extension slightly cm-ved, tapered, 

 rounded apically; aedeagus with dorsal apodeme and preatrium absent 

 or inconspicuous, ventral margin produced basally, curved dorsally 

 then anteriorly, shaft slender. 



The male holotype, Gamboa, Canal Zone, in the DeLong collection 

 has been examined. The holotype of A^. sandersi dubiata, Puerto 

 Rico, in the U.S. National Museum has also been examined. Addi- 

 tional specimens examined were from Mexico, Puerto Rico, British 

 Honduras, Panama, and Chile. 



B. sandersi (Davidson and DeLong) appears to be closely related to 

 B. incisa (Matsumura) but can be distinguished by the connective 

 which is bifid apically in sandersi and by the shape of the aedeagus 

 (see key). Linnavuori (1959) listed B. sandersi and A^. sandersi 

 dubiata as synonyms of B. incisa. 



Figure 33. — B. sandersi: a, aedeagus, lateral view; b, style and connective, dorsal view; 

 c, valve and plate, ventral view; d, male pygofer, lateral view; e, f, female abdominal 

 sternum VII, ventral view. 



Balclutha incisa (Matsumura) 



Figure 34 



Gnathodus incisus Matsumura, 1902, Term^szetr. Fiizetek, vol. 25, p. 360. 



Eugnathodus lacteus Baker, 1903, Invert. Pacifica, vol. 1, p. 2. 



Eugnathodus rninuius Osborn, 1929, Journ. Dept. Agric. Porto Rico, vol. 13. 



p. 101. [New synonymy.] 

 Eugnathodus 7ieglecta var. pallida DeLong and Davidson, 1933a, Ohio Journ. 



Sci., vol. 33, p. 56. [New synonymy.) 



