250 CALIFORNIA ACADEMY OF SCIENCES. 



Th.e prostate ghmd is one of the most characteristic parts 

 of this species, but unhappiW all the specimens were con- 

 siderably macerated, and the finer structure could not be 

 made out. Specimens from Tamaju, in the highlands of 

 Coban, showed the same characteristics as the specimens 

 from Guatemala city, and I believe the form and size of 

 the prostate constant. In structure the prostate gland 

 agrees with the same organ in O. Beddardi, sotiorcs and 

 Hendriei, but in size it is quite distinct, being even 

 smaller than the prostate in O. Hendriei. At the male 

 papilla it is only about four times as wide as the width of 

 the seta, and at the inner apex it attains double that 

 size. It gradually increases in size from the male 

 pore, but still it is very slender, and compared to the 

 prostate of O. Beddardi, is not half as long and less than 

 one-third as thick. It is entirely confined to one somite. 

 The structure appears to resemble that of O. Beddardi, 

 the lower or narrower part being furnished with tubular 

 glands, resembling those of the upper muscular part 

 only smaller. 



There is a seta close to the male pore. The outer one 

 in the pair is wanting. In this it differs from O. Bed- 

 dardi, in which the inner seta of the couple is wanting, 

 but resembles O. sonorce. It also differs in this respect 

 from O. Hendriei, in which species both setae of the 

 inner couple in somite xvii are wanting. There is no 

 enlargement of the sperm duct at the male pore. 



Habitat. In garden soils in the city of Guatemala, 

 Central America, April, 1882. Also at Tamaju, on the 

 river Polochic, on the Atlantic side of the same republic. 

 In Guatemala city it occurred in the same locality as O . 

 agricola, but was found about a month later. It is a real 

 soil species, and I never found it in wet places. 



