150 CALIFORNIA ACADEMY OF SCIENCES. 



with conspicuously obtusely produced lateral angles bear- 

 ing a spine and a long hair; the lateral margin between 

 this lateral angle and the rounded posterior angle slightly 

 concave and bare ; posterior angle with a long hair fol- 

 lowed by a short stiff hair, and by three long pustulated 

 hairs along each half of the posterior margin ; color fus- 

 cous with a darker, narrow, transverse line before the mid- 

 dle, and two similarly colored, narrow, curving lines run- 

 ning subparallel with the lateral margins. Metathorax 

 trapezoidal, with posterior angles projecting beyond the 

 sides of the abdomen; these angles with some short stiff 

 hairs and the first of a series of ten long hairs ranged 

 along the posterior margin; lateral margins bare and with 

 a slight constriction in front of the middle indicating the 

 line of fusion of meso- and metathorax; color fuscous 

 with darker, almost black, triangular blotch in posterior 

 angles, and a rather broad, pale, almost uncolored trans- 

 verse line at line of fusion of meso- and metathorax. 



Abdomen rather broadly elliptical with projecting ends 

 of segments; one long and several shorter hairs on each 

 posterior angle, and a series of about twelve hairs along 

 the posterior margin of each segment. Color pale at su- 

 tures, black interrupted (by sutures) lateral bands, and 

 a dark brown transverse band extending entirely across 

 each segment; ninth segment broadly rounded behind 

 with narrow transparent margin thickly set with a fringe 

 of short sharp-pointed transparent hairs. 



Ancistrona gigas Piaget. (Plate xiii, figs. 1 and 2.) 



Les Pediculines, Supplement, 1885, p. 117, pi. xii, fig. 8. 



Several specimens, & , $ and 0, of this remarkable form 

 from four individuals of the Pacific Fulmar, Fulmarus 

 glacialis vars. rodgersii and glupischa (Bay of Monterey, 

 California). Piaget described the species from a single 



