96 KANSAS UNIVERSITY SCIENCE BULLETIN. 



pi. V.) The tibia and tarsi are densely haired, and the tibia 

 is larger at its distal end than in any other portion of its 

 length. 



The Abdomen. 



The abdomen is composed of the typical ten segments (eight 

 and the two forming the genitalia). It is compressed and has 

 a ridge on its medial dorsal area. Each of the eight segments 

 bears a pair of dark markings either side of the ridge. The 

 first segment is narrower than the metathorax, thus giving the 

 Insect a marked constriction just back of the wings. The body 

 line curves outward, the fourth segment being some little 

 wider than the first or eighth. Viewed laterally the spiracles 

 can be seen. (See fig. 54, pi. XV.) 



The genitalia form a part of the abdomen and must here 

 be discussed. 



The Male Genital Organs, viewed laterally, present all 

 the typical sclerites. (Fig. 52, pi. XIV.) 



The supra-anal plate (g, fig. 52, pi. XIV) is joined to the 

 eighth abdominal segment by a heavy membrane. Proceeding 

 from the ventral side of the lateral face of the supra-anal plate 

 is a sclerite which extends caudad beyond this plate. Its ven- 

 tral edge curves upward, forming an apex with the dorsal 

 edge on the caudal extremity of the sclerite. It is densely 

 haired and flexible. This sclerite is a cercus, and has a mate 

 on the opposite side of the insect. (Fig. 52, p, pi. XIV.) These 

 are used as claspers. 



Clasper. — The most ventral plate in lateral aspect is a 

 clasper. It is narrowed posteriorly, hirsute, and also has a mate. 

 (See r, at figs. 52 and 51, pi. XIV.) Proceeding from the 

 inner side of the claspers are four polished, claw-like append- 

 ages (two on a side). The posterior pair are larger than the 

 other pair, which, on the other hand, are darker than the 

 posterior pair (x, fig. 52, pi. XIV). 



In ventral aspect the subgenital plate (see g, fig. 51, pi. XIV) 

 is seen. It is a fleshy sclerite, dentate twice on its ventral 

 edge. The two pairs of claw-like organs are attached to the 

 cerci beneath this plate. 



The anal plate, in lateral aspect, is boot-shaped, pale, and 

 hirsute. It is joined to the supra-anal plate by a membrane. 

 (See y, fig. 52, pi. XIV.) 



