40 CALIFORNIA ACADEMY OF SCIENCES. 



Colpocephalum maculatum Piaget. (Plate IV, fig. 2). 



Les Pediculiiies, 1880, p. 516, pi. xliii, tig. I. 



A male and a female from a Caracara, Polyborus cher- 

 iv)ay (Baja California), which I refer with much doubt 

 to this species of Piaget, taken from a Polyborus brasil- 

 iensis (Zool. Garden of Rotterdam). Piaget says that 

 maculatum much resembles C. flavescens, the common 

 Colpocephalum of raptorial birds (see Kellogg, New Mal- 

 lophaga, II, 1896, p. 525 pi. Ixxi, fig. 4). My specimens 

 do not resemble fiavescens at all closely, lacking the cross 

 bands of the abdomen, being rather differently shaped, 

 etc. But Piaget's description and figure of maculatum 

 show it also to differ from flavescens in these and other 

 particulars. My specimens measure: Male, body, 

 length 1.62 mm., width .66 mm.; head, length .34 mm., 

 width .53 mm. Female, body, length 2. mm., width 

 .72 mm.; head, length .34 mm., width .53 mm. 



Colpocephalum subaequale Nitzsch. (See Kellogg, New 

 Mallophaga, II, 1896, p. 525, pi. Ixxii, fig. 1). 



Specimens from an American Raven, Corvus corax 

 sinuatus (Baja California). Taken previously by me 

 from Corvus americanus (Palo Alto, California). 



Colpocephalum diffusum n. sp. (Plate IV, figs. 3 and 4). 



A well marked species found upon a surprisingly 

 large number of widely related bird species from Pan- 

 ama. Mr. McGregor brought specimens from the fol- 

 lowing birds: Amblycercus holoscriceus, Arremonops striat- 

 iceps, Saltator albicollis, Phoenicothrampis fuscicauda, 

 Elainea subpagana, Dendroica bryanti, Piaya cayana 

 thermophila (2 specimens), Chiroxiphia lanceolata, and 

 Ardea virescens ! From the condition of affairs I should 

 suspect straggling, but Mr. McGregor informs me that 



