Vn Heterocera from Costa Rica. 33 



Literature referred to. 



Badat, E. v. — "Die Siisswasser-Mila-ofauna Deutscli-Oat-AMkaa." 



Zoologica, Heft 59, Lief. 3. 1910. 

 EKiiAJf, S.— " Cladoceren und Frielebende Copepoden aiis Aegypten 



und dam Sudan." Swed. Zool. Exped. Egypt, pt. i. no. 8. 1904. 

 GuRNKY, R. — " On the Freshwater Crustacea of Algeria and Tunisia." 



Journ. Eoy. xMicr. See. 1909, p. 273. 

 Keilhack, L. — "Phyllopoda." Die Siisswasserfauna Deutschlands, 



Heft 10. 1909. 

 Sars, G. O. — " Contributions to the Knowledge of the Freshwater 



Entomostraca of South America." Arch. f. Math, og Naturv, 



xxiii. no. 3. 1901. 

 Stingelin, Th. — " Uutersuchungen iiber die Cladocerenfauna von 



Hinterindien, Sumatra und Java." Zool. Jahrb. (Syst.) xii, 



1904. 



EXPLANATION OF PLATE H. 



Fig. 1. Moina dubia, Pilchard. Female from the Blue Nile, X 100, 



Fig. 2. Ditto. First antenna of male, X 260. 



Fig. 3. Moina salinarum, Guruey. Postabdomen of female, X 190. 



Fig. 4. Ditto. Head of male from below, x 150. 



Fig. 5. Alona rectangula. Part of postabdomen of female, X 1050. 



Fig. 6. Chydorua sp. ? Postabdomen, X 260. 



V. — New Species of Heterocera from Costa Rica. — IV. 

 By W. SCHAUS, F.Z.S. 



Eriopyga duruscula, sp, n. 



^ . Head, collar, thorax, and fore winors light brown tinged 

 with lilacine. Abdomen fuscous, the last segment and sub- 

 dorsal tufts brown ; anal hairs yellowish. Fore wings thinly 

 irrorated with black ; a fine black anteniedial shade, incurved 

 in cell, outcurved below cell; orbicular and reniform very 

 large, outlined in buff; the postraedial fine, black, indistinct, 

 slightly incurved below reniform, followed on veins by black 

 and greyish irrorations ; a subterminal straight buff line; the 

 veins terminally irrorated with black and greyish ; base of 

 fringe finely buff. Hind wings thinly scaled, fuscous grey ; 

 the fringe Inteous. 



Expanse 31 mm. 



Hob. Volcano Poas. 



Belongs to the group of E. purpurigera, Gn. 

 Ann. & Mag. V. Hist. Ser. 8. Vol. vii. 3 



