64 NORTH AMERICAN MALLOPHAGA 



a median group of six spines on the posterior margin. Second to seventh 

 segments each with a transverse row of spines divided into three distinct 

 groups, the median group containing from six to eight spines and each 

 lateral group five to seven spines. Eighth segment with a continuous 

 transverse row of ten or twelve spines. Ninth segment with numerous 

 short spines at the tip. First and second segments with several short 

 spines along the lateral margins, the second to eighth segments each with 

 a pair of spines near the middle of the lateral margin, those on the sev- 

 enth and eighth segments being longer than the others. On the ventral 

 side the spines in the transverse rows are more numerous, there being 

 from twelve to fourteen in the median groups. 



Genitalia conspicuous, the basal plate consisting of two chitinous 

 bars which are widened and thickened at their posterior ends. Penis long 

 and stout, the arms not diverging widely and being but slightly longer 

 than the shaft. Beneath the penis a short, cuneiform, backward-pointing 

 plate, with the posterior end deeply bifid. 



Trichodectes retusus Nitzsch. 

 Trichodectes retusus Nitzsch, in Giebel, Ins. Epiz., p. 55, pi. 3, fig. 4, (1874). 



Reported by Osborn from a weasel (Ames, Iowa). It was originally 

 described from an Old World weasel. 



Trichodectes octomaculatus Paine. 



Trichodectes octomaculatus Paine, Ent. News, vol. 32, pp. 438-439, pi. 20, fig. 1, 



(1912). 

 Trichodectes procyonis Neumann, Arch, de Parasit, vol. 15, pp. 624-626, fig. 14,, 



(1913). 



This species was described from a raccoon, Procyon psora (Stanford 

 University, Calif.), and we have since met with it on the same host. We 

 have not seen specimens of Neumann's T. procyonis, but the comparison 

 of our specimens with his description and figure has convinced us that 

 T. procyonis is identical with T. octomaculatus. Neumann's specimens 

 were from Procyon lotor (British Columbia). 



Trichodectes quadraticeps Chapman. 



Trichodectes quadraticeps Chapman, Ent. News, vol. 8, p. 185, fig., (1887). 



Specimens from Urocyon cinereo-argenteus sequoiensis (Freestone r 

 Sonoma county, Calif.). Originally described from specimens taken 

 from the same host. 



