ZooL.— Vol. II.] 



RISEN— OLIGO CHAL TA . 



209 



It is found in the pine region at Toluca, at an altitude of 

 8,000 feet, and has every indication of being an indigenous 

 form. Its most interesting character is the abnormal posi- 

 tion of the sperm-ducts, which makes the species a con- 

 necting link between Benhamia and Dichogaster . 



Benhamia Bolavi Michaelsen, pacifica, var. nov. 

 Plate X, Figs. 68-73. 



Definition. — Length 30 mm.; number of somites about 95. First dorsal 

 pore V/VI. Clitellum incomplete, in XIII-XX. Penial setae, the longer with 

 six sharp-pointed notches, the shorter spoon-like but with no prongs. Com- 

 mon setce couples equidistant. Oviducts open in a single pore on a median 

 papilla in line between setae a, in center of somite XIV. Gizzards in VIII. 

 Calciferous diverticles, three pairs, in XV, XVI, XVII; the two anterior pairs 

 connected as one. Sperm-sacs in XI and XII. Sperm-masses in X. Micro- 

 nephridia in three rows on either side. Spermatheca, basal part with small 

 stalked diverticle pointed forwards, apical part much narrower than the basal 

 part. Sacculated intestine begins in XIX. Color pink. 



Habitat. — Honolulu, 

 ander Craw. 



Hawaii. Presented by Mr. Alex- 



Ajinity .—This form comes so very near B. Bolavi that 

 it seems best to refer to it only as a variety under that spe- 

 cies. There are a number of minor differences which 

 appear constant and which are of considerable interest. In 

 order to facilitate a comparison of the three forms of B. 

 Bolavi so far recognized, a table is given of the principal 

 differences noted. 



Table of Benhamia Bolavi and Varieties. 



Benhamia Bolavi. 



Length. 



40 to 60 mm. 



Penial Setce. 



The largest with 5 to 8 

 notches, the smaller 

 spoon-like, slightly 

 forked. 



Gizzards. 



Situated in VII. 



Benhamia Bolavi, 

 var. pacifiea. 



Length. 



30 mm. 



Penial Setce. 



The largest with 6 spine- 

 like notches, the smaller 

 spoon-like, not forked. 



Gizzards. 

 Distinctly in VIII. 



Benhamia Bolavi, 

 var. palmieola. 



Length. 



50-60 mm. 



Penial Setce. 



The largest with 4 blunt 

 notches, the smaller 

 spoon-like. 



Gizzards. 

 Distinctly in VIII. 



