MYRIAPODA 69 



which are natives of alpine districts of limited area. Thus far but two 

 species of this group are known from the northwestern region Cono- 

 tyla atrolineata (Bollman), from Alaska, and C. glomerata (Harger), 

 from Oregon. 



Genus Conotyla Cook & Collins. 

 Conotyla COOK & COLLINS, Ann. New York Acad. Sci., ix, p. 70, 1895. 



CONOTYLA ATROLINEATA (Bollman). 



Craspedosoma atrolineatum BOLLMAN, Proc. U. S. Nat. Mus., x, p. 618, 1887; 



Bull. 46, U. S. Nat. Mus., pp. 35, 183, 1893. 

 Conotyla atrolineata COOK & COLLINS, Ann. New York Acad. Sci., ix, p. 75, 



1895. 

 The type of this species was collected at Glacier Bay, Alaska. 



CONOTYLA GLOMERATA (Harger). 



Trichopetalum glomeratum HARGER, Amer. Jour. Sci. and Arts, iv, p. 118, 



1872. 

 Craspedosoma glomeratum BOLLMAN, Proc. U. S. Nat. Mus., x, p. 619, 1887; 



Bull. 46, U. S. Nat. Mus., pp. 36, 120, 1893. 

 Conotyla glomerata COOK & COLLINS, Ann. New York Acad. Sci., ix, p. 78, 



1895. 



u A single specimen of this species was collected by the writer in the 

 valley of the John Day River, Oregon, in October, 1871 " (Harger). 



Order Zygocheta. 



Diplopoda with 30 segments and upward, the ventral plates generally 

 adnate to but never coalesced with the dorsal part of the exoskeleton. 

 Seminal apertures located in a pair of adnate external ducts inserted 

 below the second pair of legs. The gnathochilarium has the stripes 

 in contact between the mentum and promentum. 



The north-temperate order Zygocheta has superficial similarity to 

 the tropical Anocheta and Diplocheta, but nearly all the details of 

 structural specialization are different. 



There are three families of Zygocheta in eastern North America, 

 the Isobatidse, the true Julidas, and the Parajulidas, but only the last is 

 known from the Northwest. 



Family PARAJULIDJE. 



First pair of legs of male strongly hypertrophied and crassate, the 

 second pair atrophied ; gonapods exserted. In the true Julidae of 

 Europe and eastern North America the males have the first pair of 

 legs atrophied and the gonapods are entirely concealed within the body 

 cavity. 



