THE MTRIAPODA OF NORTH AMERICA. 



197 



of a long, very slender, almost setiform process, and a shorter straighter one. The former 

 at its base is bent at right angles to itself; and distally it is somewhat spirally arched over 

 the other. 



The female (Fig. 29) appendages consist of two broad, robust, pilose processes, with a 

 pair of very slender, almost filiform, feet-like 



F\g. 28. 



Pig. 21). 



bodies, springing from their conjunction and 

 equalling them in length. The major por- 

 tion of each appendage is composed of a 

 single plate. This is folded on itself, so as 

 to constitute an irregular, flattened cylinder, 

 wliich is open at its end and along the outer 



edge. It presents on one aspect an unbroken, tolerably regular surface, but on the other 

 is proximally abbreviated. Through the opening thus afforded projects a pair of subcir- 

 cular, somewhat globose plates, fitting together much as the shells of a bivalve. The fili- 

 form processes are on the former surface. Length, 2 inches. 



Bab. Illinois. Smithsonian Institution. — R Kennicott. Georgia. Coll. A. N. 8. — Dr. J. L. Le Conte, U.S. A. 



T\a. 30 



In the Kennicott collection I have seen a male lulus very closely resembling the for- 

 mer, but differing so much in its genital appendages that it probably represents a dis- 

 tinct species. The outer of the two parts, forming each appendage;, consists of a thin, 

 flat, crooked, very irregular process, and a shorter, robust, pilose, and 

 strongly elavate one. The former, proximally, is quite broad, and narrows 

 from the base, but distally is but at a right angle to itself, and is rapidly 

 contracted, so as to terminate in a nearly cylindrical crooked point. The 

 main procejs (Fig. 30) of the inner portion is somewhat cylindrical proxi- 

 mally, but is distally expanded. At first bent at a right angle to itself, it 

 next has the swan-neck curve, and is then bent at an acute angle to itself 

 to be straight the remainder of its length. At this angle there is a minute sharp spine. 

 Shielded, as it were, by this process, there is another, very slender and acute. 



It is most probable that /. venustus, Wood, is the species intended to be indicated by 

 Mr. Say under the name of impressus, although his description is so meagre that it could 

 be applied to other species. The locality would seem to fix it, however. Mr. Say's de- 

 scription is given below in full. 



"lb-own, a scries of lateral black dots, beneath yellowish white; ultimate segments 

 mucronate." 



" Body cylindrical, emarginate, above brownish, beneath yellowish white, appearing 

 glabrous; segments each with a lateral black spot, whitish lines and dots sometimes obso- 



