208 



THE MYRIAPODA OF NORTH AMERICA. 



Pig 



The color of this species is a very dark brown, sometimes with a reddish, sometimes with 

 an olive or even bluish tint. The head is quite deeply emarginatc. The vertex furrow 

 is pronounced. The first scutum is margined with deep red both anteriorly and posteriorly. 

 The posterior borders of the other scuta are furnished with a narrow, dark brownish, red 

 imagination. 



The male appendages (Fig. 35) are formed of two outer parts and the yoke-like piece 

 which connects them. The former are composed of the following parts : 

 First. A thin plate bent around the inner portion; this is deeply 

 notched laterally, but presents on one aspect a long, low, smooth sur- 

 face ; on the other it is produced into a broad process, rapidly narrow- 

 ing and terminating distally in a very narrow, blunt portion, which is 

 abruptly bent on itself, but does not form a hook. Next within this 

 is a large, thick, blunt, curved process, composed of a plate so bent on 

 itself as to make a sort of sheath, in which lies a thin, flat, blunt, 

 slightly falciform process. 



Hub. United States. 



M. Girard has described two species of lulus from the Southwest, atratus and ornatus. 

 His description of the latter applies to 1. marginatus. I have seen the type of I. atratus, 

 but unfortunately in such a bad state of preservation that I am unable to decide with cer- 

 tainty its claims to rank as a species ; it is, probably, however, nothing more than a 

 variety. The descriptions of M. Girard arc given below in full. 



I. ORNATUS. 



" Spec. Char. — Ground-color bluish black ; segments narrowly margined posteriorly with 

 reddish ; anterior margin of segments rather blue, whilst the middle is rather black, thus 

 giving the appearance of three rings of color. The anterior portion, which is covered by 

 the articulation, is fulvous. Feet deep chestnut-brown. Antennas rufous at base, blackish 

 at tip. Stigmata not conspicuous, marked by a series of small obsolete blackish spots." 



" Remarks. — This species is allied to lulus marginatus of Say, but the body is propor- 

 tionally much stouter. The ocelli are disposed upon a subtriangular space quite different 

 in shape. The antennae themselves are slenderer in proportions. The labrum (upper lip) 

 is also less emarginated than in lulus marginatus, and the marginal punctures much less 

 conspicuous." 



I. ornatus, Girard, Marcy's Report, Exploration lied River of the Houth, p. 274. 



I. ATRATUS. 



" Spec. Char. — Body, feet, and antennas, uniform dee]) blackish brown ; antennae and feet 



