THE CANADIAN ENTOMOLOGIST. 67 



THE LITHOBIOMORPHA OF COLORADO. 



RALPH V. CHAMBERLIN, BRIGHAM YOUNG UNIVERSITY, PROVO, UTAH. 



The records given in the present paper are based upon a study of 



collections made by Prof. T. D. A. Cockerell, chiefly in Boulder Co., and 



by the author during brief periods spent near Glenwood Springs (1904) 



and at Colorado Springs and Manitou (1910). The list is necessarily but 

 partial, and when collecting for Myriapoda has been done in other sections 

 the number of species will undoubtedly be considerably increased. 



Family Henicopidce. 

 In addition to the Lamyctes listed below, another member of the 

 family will in all probability be found at upper elevations in the Colorado 

 Mts. This is Zygethobitis doHchopus Chamb., which has been found by 

 the author in the Uintah Mts., as well as in the Wahsatch and Sierra 

 Nevada Ranges. It may readily be distinguished from the Lamyctes by 

 its larger size, by having the posterior angles of the ninth, eleventh and 

 thirteenth dorsal plates produced, whereas they are straight in the 

 Lamyctes, and by having the tarsi all biarticulate instead of those of the 

 first thirteen pairs being undivided. 



Lamyctes fidvicoi'tiis Meinert. 

 Two specimens, agreeing fully with some from Wisconsin, 111., etc., 

 were taken by the author at Colorada Springs (Aug., 19 10). 



Family LithobiidcB. 

 But one genus of this family is represented by the species thus far 

 found within the State, namely, Lithobius. None of the species conforms 

 to Monotarsobius, which Verhoeff would separate from Lithobius. 

 Probably Vothropolys will be found in the western or north-western parts 

 of the State, where B. bipunctatiis and possibly also B. permimda or an 

 allied species may be expected. The following key will aid in showing the 

 relations between species thus far known from the region. 



Key to Species of Lithobius. 

 a. Angles of the 7th, 9th, nth and 13th dorsal plates produced. 

 Articles of antennae 30-40 ; prosternal 



teeth, 6 + 6, 7 + 7 • . . L. 7nordax Koch. 



aa. Angles of the 9th, nth and 13th dorsal plates produced. 



b. Claw of anal legs armed with a single spine or accessory claw 

 at base. 



February, 1911 



