1988] 
Wolfe — Hydrovatus methlini 
331 
Figure 2. Abdominal structure of C. hubelli (60X) A) Acute, pointed, spear- 
shaped dorsal lamina of tergite 8. B) Ventral lamina. C) Ventral view of terga 6 
and 7 showing apodemes on tergum 7. D) Composite illustration of terga 7 and 8. 
been postulated for larval methlines because of the peculiar poste- 
riorly extended lateral tracheal trunks located at the abdominal 
apex (Spangler 1973). 
Discussion 
Wolfe (1985) presented considerable evidence that Hydroporinae 
is monophyletic. Among taxa examined (Table 3), Laccornis, Meth- 
lini, Hydrovatini, Canthyporus, and Lioporeus were considered the 
