86 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 85 



Brown, paler below and with 3 pale transverse diffuse areas on 

 body. Fins more or less brownish. Dorsals and anals, also head 

 and body, with obscure pale to whitish spots and blotches, very 

 variable. Caudal blackish on outer portion, with row of small 

 whitish spots transversely. Pectoral with broad white subbasal band, 

 adjoining blackish area over branched rays and another terminally; 

 lower detached rays with dark spots. Ventral blackish, little paler 

 basally. 



Type.—V.S.'NM. no. 98905. (22403.) Canmahala Bay. March 11, 

 1909. Length 57 mm. 



Reraarks. — Greatly like Iniinicus fUamenfosus^ but only the upper- 

 most pectoral ray ending in a filament, which reaches well beyond 

 the depressed pectoral fin. 



{bis, two + -filum, thread.) 



Family APLOACTIDAE 



ANALYSIS OF GENERA 



a}. Preorbital with 2 strong spines both projecting back behind 



eye; A. i, 7; ventral I, 2 Acanthosphex 



a*. Preorbital with single strong spine ; A. spines III ; ventral I, 



4 or 5 Prosopodasys 



a*. No preorbital spine; first 3 dorsal spines not set off from rest 



of fin; D. VII, 15 to 18 Aploactoides 



ACANTHOSPHEX, new genus 



Type. — Prosopodasys leim/nnis Jordan and Seale. 



Body elongate ellipsoid, compressed. Head moderate, compressed. 

 Fine teeth in jaws and on vomer, none on palatines. Two short 

 barbels at cli<in. Suborbital spines long, both project backward 

 behind eye. Preopercular spines all enlarged and long. Spines of 

 first dorsal longest of dorsal seiies, first fin also separated from sec- 

 ond spinous section. A single, feeble, short anal spine. 



{aKavda, spine + tr^i?^, wasp; with reference to the long spines of the 

 head.) 



Genus PROSOPODASYS Cuvier 



PROSOPODASYS CYPHO. new species 



Figure 39 



Depth 21/,; head 21/0, width 2. Snout 4 in Iiead from snout tip; 

 eye 4, subequal v, ith snoui;, greater than interorbital; maxillary 

 reaches i/o in eye, expansion IV3 to V/o-, length 2 in head from snout 

 tip; patch of finely villiform teeth on vomer and each palatine; 

 interorbital 5i/^, moderately low, depressed or slightly concave; sub- 

 opercular and uppermost preopercular spine subequal or i/o of eye; 



