114 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



Sperm-ducts are not enlarged near the pore. Ovipores in front of and some- 

 what dorsal to setae b. Septal glands of about equal size. Sacculated intes- 

 tine in XII. Diverticles of the oesophagus are not divided into chambers. 

 Prostates, one pair, very thick and large. 



Habitat. — The type is from Fresno, California. In the 



collection there are also a number of specimens from 



Durango, Mexico, collected by Mr. James Ainsa in the 



parks of the city, in January, 1899. 



It is interesting to note that the specimens from Durango 

 resemble those from California rather than those from 

 Arizona. 



My former description of this interesting species was 



based on dissections and not upon sections, and, therefore, 



some characteristics escaped observation. Having since 



sectioned specimens from the original locality as well as 



from Durango, a more detailed description can now be 



given. 



Detailed Description. 



Set(£. — The ventral setse in the clitellum are a little farther 

 apart than the corresponding setae anterior and posterior to 

 the clitellum, the distance a-b being a trifle greater than 

 the distance c-d. This arrangement is more pronounced in 

 the Durango specimens. 



Sexual Zone. — The specimens from Durango which had 

 been placed directly in alcohol have in the centre of XVII 

 a markedly depressed sexual zone, which encloses the two 

 male papillae. This depression is much less pronounced in 

 the specimens from Fresno. In the middle of the zone the 

 two male papillae stand out boldly. The papillse are oblong- 

 rounded, with a narrow wedge-shaped prolongation towards 

 the median line. The main part of the papillse is situated 

 immediately dorsal to the ventral set^ ab, which are both 

 present. 



Septal Glands. — The septal glands, in V to VIII, are all 

 of about the same size. The species differs in this from the 

 var. arizoncB, in which the posterior glands, in VIII, are 

 much smaller than those anterior. The dorsal part of the 

 suprapharyngeal glands is continuous with the dorsal part of 

 the septal glands in V. 



