no. 2381. 



CRUSTACEA FROM VENEZUELA— PEARSE. 



461 



AEGATHOA LAZZARI, new species . 



Aegathoa lazzari Pearse (nomen nudum), Univ. Wisconsin Studies in Science, 

 No. 1, p. 39, 1920. 



Type. — University of Michigan, Museum of Zoology, Cat. No. 52001. 

 In Lake Valencia, Venezuela, at mouth of Rio Bue, July 20, 1918. 

 Parasite on Sardina Paleta {Astyanax bimaculatus Linnaeus). (Para- 

 type, Cat. No. 53772, U. S. N. M.). 



Body. — 3.7 mm. long; 1.3 mm. wide. Head wider than long, and 

 narrower posteriorly. Eyes large, ellipsoidal; with about 48 facets; 

 almost covering postero-lateral angles. First antennae with seven 

 segments, second antennae with eight segments. MaxilHpeds bearing 

 a two-segmented palp, which is armed at the tip with two hooks. 

 First maxilla slender, armed at tip with three pairs of hooks; second 

 maxilla robust, armed at tip with two pairs of hooks. First segment 



Fig. 2.— Aegathoa lazzari, new species. M 1 , first maxilla; M», second maxilla; Mp, maxil- 



lipeb; T, telson; U, uropod. 



of thorax longest, 0.5 mm. The following segments progressively 

 shorter. The epimera of all segments except the first separated on 

 the lateral margins. Abdomen somewhat narrower than the thorax; 

 length, 1.8 mm. Segments as long as those of the thorax. Sixth or 

 terminal segment broadly rounded and obtusely pointed posteriorly. 

 Uropoda extending beyond tip of terminal segment. Both rami of 

 uropoda rounded posteriorly. Posterior margins of the uropoda and 

 the terminal abdominal segment are fringed with hairs. All the legs 

 are prehensile and end in long curved dactyli. They are without 

 spines. 



This species was also found on a sardina (Gephyrocharax valenciae 

 Eigenmann) collected in shallow water near Maracay (Lake Valencia) 

 July 24, 1918. 



