70 Annals Entomological Society of America [Vol Vv; 
The egg of Caraphractus cinctus as dissected from the female 
is white, elongate-ovate, and provided with a short pedicel at 
its larger end (Fig. 3). Length .16 mm.; width .043 mm. 
The ovaries contain a large number of eggs. 
Caraphractus cinctus Walker is an older name for Polynema 
natans Lubbock. Upon finding that our specimens agreed with 
the figures and description of the latter as given by Lubbock 
(1863) we forwarded specimens to him for identification. Lord 
Avebury kindly sent these specimens to Mr. Fred Enock for 
comparison with British examples. After examination Mr. 
Enock informs us that he is of the opinion that they are identical. 
LIST OF KNOWN AQUATIC HYMENOPTERA. 
CHALCIDID. 
Prestwichia aquatica Lubbock, 1863. Parasitic on the eggs 
of Notonecta, Ranatra, Dytiscus, and Pelobius. 
Hydrophylax aquivolans Matheson and Crosby, 1912. Para- 
sitic on the eggs of Ischnura. (New York). 
PROCTROTRYPID. 
Limnodytes gerriphagus Marchal, 1900. Parasitic on the 
eggs of Gerris spp. (France and New York). 
Limnodytes setosus De-Stefani Perez, 1902. Parasitic on 
the eggs of Gerris sp. (Sicily). 
MyYMARID&. 
Caraphractus cinctus Walker, 1846. (Polynema natans Lub- 
bock, 1863). Parasitic on the eggs of Notonecta. (England 
and New York). 
Anagrus subfuscus Heymons, 1908. Parasitic on the eggs 
of Calopteryx virgo L. (Germany). 
BRACONID. 
Gyrocampa stagnalis Heymons,1908. Host unknown. (Europe) 
Dacnusa rousseaut Schulz, 1907. (Europe). 
-~ Chorebus natator Schulz, 1907. (Europe). 
AGRIOTYPID. 
Agriotypus armatus Walker, 1836. Parasitic on larve of 
Trichoptera. 
