THE CANADIAN ENTOMOLOGIST. 69 



LitJiobius harrietce Chamberlin. 

 Described originally from specimens collected some miles east of 

 Glenwood Springs (author, 1904). Several specimens of the species have 

 also been received from Prof. Cockerell, who secured them in Boulder Co. 



Lithobius forficatus (Linnaeus). 



Numerous specimens were obtained by the author at Colorado 

 Springs (1910). The species will doubtless be found common in and 

 about towns along the western sides of the mountains, and especially 

 northward. This is the most abundant North American member of the 

 genus, occurring throughout the northern sections, but not ranging into the 

 southern States. 



Lithobius dopaintus, sp. nov. 



None of the dorsal plates with posterior angles produced. 



Articles of antennae 20. 



Ocelli about 15, arranged in f(aur series : i +e,i.5, 3, 3. The ocelli 

 of the most dorsal series distinctly larger than the others. 



Prosternal teeth 2 + 2. 



Last two pairs of coxse laterally armed, the last three pairs dorsally 

 armed. 



Spines of the first legs 1,3, i; of the penult i, 3, 3, 2, the claw armed 

 with a single spine ; of the anal i, 3, 3, i, the claw armed likewise with a 

 single spine. 



Coxal pores round, 4, 6, 5. 5. 



Claw of the gonopods of the female tripartite ; basal spines 2 + 2, 

 apically bi- or tridentate. 



Length, 12-16 mm. 



Locality, ]\lanitou (author, 1910). 



About a dozen specimens were secured. Apparently most closely 

 related to Z. socins Chamb. of Utah. 



Lithobius tivius Chamberlin. 



Angles of none of the dorsal plates produced. 



Articles of anteanae 25-32, but mostly 28 and 30. 



Ocelli mostly 8 or 9, arranged in two series, which form a narrowly 

 elongate patch : i + 4, 3-1 + 5, 3. 



Prosternal teeth 2 + 2. 



None of the posterior coxae armed either laterally or dorsally. 



Spines of the first legs o, i, i ; of penult i, 3, 3, i, the claw armed 

 with one spine; of anal 1,3, 1,0 (mostly) -i, 3, 2, o (rarely i, 3, o, o), the 

 claw armed with one spine. 



