2 University of Michigan 



gations. An abrupt offset on outer margin marks the joint 

 between the first and second segments. 



The two penes (Fig. ib) are straight, sHghtly divergent, 

 square in cross section, and extend about to end of second 

 caudal segment. Each bears, on its mesial margin, a stout, 

 curved spine, bearing three or four small teeth on its convex 

 (mesial) margin. These two spines are so placed that a near- 

 Iv circular area is enclosed 1)etween them and the bases of the 

 two penes. 



Female. — Length lo mm. First segment of second antenna 

 about as long as in the male, but more slender, its length be- 

 ing a little more than three times its thickness (Fig. ic). The 

 segment is nearly straight and tapered somewhat in distal 

 third ; it bears on its mesial surface, near the middle, a small 

 thumb-like process extending parallel to the appendage. The 

 second segment is represented by a slightly curved spine, which 

 arises from the inner, distal angle of the first segment. This 

 spine and the thumb-like appendage of the first segment are 

 of about the same size and proportions. 



The ovisac is attached to the ventral surface of the elongated 

 second caudal segment, and has the form of a compact sac, 

 extending very little beyond the caudal end of the segment.- 

 In 22 specimens examined, it never contained more than six 

 eggs. 



In other respects the female closely resembles the male. 



Type Specimens: Cat. No. 52030, Museum of Zoology, 

 University of Michigan; Collected on Stanford Campus, Palo 

 Alto, California, by Professor Harold Heath, April 10, 1922. 



