56 BULLETIN 1107, U. S. DEPARTMENT OF AGRICULTURE. 



external margin serrate; anterior pair terminating in a hooklike spur, the mid- 

 dle and posterior pairs differing in having two tibial spurs. Tarsi 5-jointed, 

 first joint very short, last longest, distal end bearing simple claws. 



Abdomen: Tergites eight, first longest, anal or pygidium nearly quadrate, in- 

 termediate about equal in length. Spiracles seven, first much the largest. Ster- 

 nites eight, 1 and 2 hidden by the sternellar area, 3, 4, 5, 6, and 7 plainly visible 

 and sparsely covered with fine light hairs, 3, 4, 5, and 6 varying but little in 

 length, 3 being largest, 7 and 8 differing as to sex. In the male the seventh ster- 

 nite has distinct pleural pieces, anal end truncate, while in the female these pieces 

 are less distinct, anal end emarginate ; this latter character is hard to detect 

 in living active specimens, being somewhat obstructed by the thick pubescence. 

 The eighth or anal sternite in both sexes is retracted into the abdomen. In the 

 male this sternite has two loosely connected chitinized shields covering the 

 oedagus and anus : just dorsad of this shield another sclerite gives further pro- 

 tection to the oedagus. in the form of a transparent sheath (outlined with 

 rather strong deeurvod chitinized margins that are recurved and divided at 

 apex) just ventrad of the oedagus, which is slender and obtusely pointed. 

 Length of vasa deferentes, 0.23 millimeter ; length of oedagus. 0.34 millimeter. 

 In the female this sternite is firm and more compact. It includes both the anus 

 and the ovipostor. The anus bears a separate shield that is flanged ventrally 

 through which the ovipositor is guided. The oviposter is long, about 2.37 milli- 

 meters, slender and flat with the exception of the apex which is slightly 

 enlarged, subcylindrical, and bears a few rather rigid irregular seta? ; the apex 

 consists of about 0.27 millimeter of the ovipositor, including the 0.04 millimeter 

 palpi at the terminal. Between the palpi the terminal is bilobed. 



