106 CALIFORNIA ACADEMY OF SCIENCES. 



Oncophorus. 

 Oncophorus bisetosus Piaget. (Plate VII, fig. 6). 



Les Pediculiues, 1880, p. 217, pi. xviii, fig. 4. 



Several specimens from the Californian Clapper Rail, 

 Rallus obsoletus and the Virginia Rail, Rallus virgin- 

 ianus (Palo Alto, California). Piaget's specimens were 

 taken from Rallina plumheiventris , R. tricolor and R. 

 isabellina. He also found specimens on a Yellow Rail, 

 Porzana noveboracensis (from North America, in the 

 Maseum of Leyden). The specimens from this last 

 bird are distinguished by the varietal name porzance, 

 being slightly larger than the type specimens and show- 

 ing certain small differences in hairs and markings. Our 

 specimens from Rallus obsoletus and R. virginianus agree 

 with var. porzance in departing in the matter of size 

 and hairs of dorsal surface of abdominal segments from 

 the type specimens, but go farther in differing and must 

 be distinguished by a varietal name. 



Var. californicus Kellogg and Chapman, (Plate VII, 

 fig. 6). From the Californian Clapper Rail, Rallus obso- 

 letus (Palo Alto, California) and the Virginia Rail 

 Rallus virginianus (Palo Alto, California). (In the fol- 

 lowing list of measurements the figures in parentheses 

 are those given by Piaget for the type specimens). 

 Female. Body, length 1.72 mm. (1.35 mm.), width .5 

 mm. (.47 mm.); head, length .53 mm. (.47 mm.); 

 width .4 mm. (.38 mm); seven hairs on margin of fore- 

 head, of which two are longer and dorsal, instead of six 

 with one dorsal as in the types; a prominent hair in 

 the eye not mentioned in the description of the types; 

 two median hairs on dorsal aspect of each abdominal 

 segment, as in the variety porzanw Piaget, instead of 

 four as in the species type. The female has large 



