168 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 117 



Type genus. — Haiistorius Mliller 1775. 



Component genera. — Haustorius Miiller 1775; Eohaustorius Bar- 

 nard 1957; Protohaustorius, new genus; Parahaustorius , new genus; 

 N eohaustorius, new genus; Pseudohaustorius, new genus; Acantho- 

 haustorius, new genus. 



Remarks. — The status of Le'pidactylus Say 1818 is being clarified 

 elsewhere (Bousfield, in prep.). Despite the wealth of descriptive de- 

 tail, Say's species, L. dytiscus, cannot be identified with certainty 

 with any of the species or even genera herewith proposed as new. 

 Unfortunately Say's type is not available. Recent studies on ma- 

 terial of Haustorius (or near relative) endemic to the Atlantic coast 

 of Georgia and Florida indicate that a common intertidal estuarine 

 species, presently being redescribed, is probably Say's species. 



Antiboreal genera Cardenio Stebbing 1888, Urohaustorius Sheard 

 1937, Urothoides Stebbing 1891, Platyischnopus Stebbing 1888, and 

 Phoxocephalopsis Schellenberg 1931, show characteristics of the 

 present two subfamilies but are distinctive and divergent rather than 

 transitional. Further study of their subfamily afl&nities, based on 

 fresh material, is suggested. 



Key to Genera and Species of Haustoriidae in New England Waters 



1. Body usually slender, peraeon segments not laterally lobate; rostrum weak 



or lacking, eyes usually well pigmented; pleosome and urosome normal; 

 gnathopod 1 subchelate; gnathopod 2 simple or subchelate; peraeopods 

 with small dactyls; peraeopods 3-5, segments 4 and 5 not broadened; 

 uropod 2 spinose, similar to but smaller than uropod 1; maxilliped palp 

 slender, 4-segmented; lower lip, outer lobes with lateral wings. 



PONTOPOREIINAE. 2 



Body usually broad, peraeon segments laterally lobate; rostrum distinct, 

 eyes weakly pigmented or lacking; pleon usually abruptly narrowing 

 beyond peraeon, urosome variously reduced; gnathopod 1 simple, gnatho- 

 pod 2 minutely chelate; peraeopods without dactyls; peraeopods 3-5, 

 segments 4 and 5 posteriorly broadened; uropod 2 setose, much smaller 

 than and unlike uropod 1; maxilliped palp 3-segmented; lower lip, outer 

 lobes laterally rounded Haustoriinae. 7 



2. Antennae 1 not geniculate, peduncular segment 1 shghtly longer than 2 



and 3 combined; peraeopod 3 of normal attitude; uropod 3, outer ramus 



less than twice the peduncle, terminal segment vestigial 3 



Antenna 1 geniculate between peduncular segments 1 and 2, segment 1 

 much longer than 2 and 3 combined; peraeopod 3 doubly geniculate; 

 uropod 3, outer ramus more than twice the peduncle, terminal segment 

 conspicuous 5 



3. Body slender, pleosome smooth or hirsute dorsally; eyes well pigmented; 



accessory flagellum 2-segmented; coxal plates 1-4 normal; gnathopods 1 



and 2 subchelate, dissimilar Pontoporeia. 4 



Body broad, pleosome segments 2 and 3 (occ. 1) mid-dorsally toothed; 

 eyes lacking; accessory flagellum 3-4 segmented; gnathopods 1 and 2 

 subchelate similar Priscillina 



