ANNALS. 



OF 



The Entomological Society of America 



Volume III DECEMBER, 1910 Number 4 



DIPLOPODA FROM THE WESTERN STATES. 



By Ralph V. Chamberlin. 

 Brigham Young Univ., Provo, Utah. 



FAMILY CALLIPODIDAE. 



Lysiopetalum mutans sp. nov. 



General color of body above dark brown to almost black; a narrow 

 median line of yellow extending from the anterior margin of the second 

 dorsal scutum to the end of the anal scutum; a broader pale stripe of 

 darker caste than that of the median line along each side from the 

 anterior margin of the first segment to the end of the body; lower por- 

 tion of sides and the entire venter yellowish. Legs yellow on inner 

 or ventral surface proximally, the distal articles commonly darker; 

 dorsally brownish, likewise darker distally. General color of head 

 brown; vertex areolate with dark-brown over a lighter ground; a 

 smok}'- or blackish brown area between eye and antenna of each side 

 and those of the other, the area narrowing to a median point down the 

 front, the region each side of this elongation areolate like the vertex; 

 clypeus and labrum light brown to yellow. Antennae deep brown 

 or blackish excepting the two distal articles which are whitish. 



Vertex of head crossed by a narrow median longitudinal furrow 

 which is subdivided by a fine line-like elevation; head depressed trans- 

 versely a little ventrad of bases- of antennae ; subdcnsely hirsute with 

 short stiff hairs or setae which are somewhat longer in the clypeal 

 region. 



Gnathochilarium broad; greatest width of mentum 33^ times as 

 great as the median length; lingual lamellae, exclusive of its processes, 

 twice as long as the greatest width. 



Eyes well developed, black, subtriangular; "the ocelli numerous, 

 compactly and seriately arranged. Below eye area proper on each 

 side is what appears to be an organ of sense; it is much larger than an 

 ocellus, convexly elevated and transparent, the convex portion appar- 

 ently covering a pit in which is a conical body like a sense-cone of the 

 antennae. 



Antennae long and moderately clavate; clothed with mostly short 

 hair intermixed with some longer ones; length 2 mm. 



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