92 KANSAS UNIVERSITY SCIENCE BULLETIN. 



and mandibular sclerites. Such a section is shown at figure 

 48, plate XIV. 



Maxillary Set^. As the setae enter the head they separate, 

 going either side of the pharynx and extending to the top of 

 the epicranium. The setae widen as they approach this ex- 

 tremity. Each seta is fastened to the epicranial wall by a 

 heavy muscle (a, fig. 48, pi. XIV), from which arises another 

 muscle, which is attached to the upper side of the seta and 

 forms the refractory muscle. Attached to the lower edge of 

 the widened extremity of the seta is a pair of muscles, one of 

 which is branched. This pair of muscles proceeds along the 

 line of the seta and are attached to the inner surface of the 

 maxillary sclerite at its distal end, thus forming the pro- 

 tractory muscles. 



Mandibular Set^. The mandibular setae, in the head, lie 

 laterad of the maxillary setae. They do not extend as far into 

 the head, as they are joined to the mandibular sclerite by an 

 articulating joint. The seta is connected to the epicranial wall, 

 however, by a very strong muscle, the retractor {t, fig. 48, pi. 

 XIV). The protractor is shown at n; this muscle is branched 

 at the end attached to the sclerite. This attachment is not 

 visible in the figure. In this same section is shown a longi- 

 section of the salivary ejaculator or pump of the suctorial ap- 

 paratus. (See c, fig. 48, pi. XIV.) Connected to this pump 

 are the ducts which supposedly lead to the salivary glands, 

 although the glands have not been satisfactorily located by the 

 writer. 



The Pharynx may be seen in both the transverse and longi- 

 tudinal sections, as it enters the head in such a manner that a 

 cross section of it is obtained near the back of the head in a 

 transverse section (fig. 47, pi. XIII) and turns downward, 

 passing over the oesophagal ganglion, and is found again in 

 longi-section. 



Ganglia. In longi-section and through the compound eyes 

 near the top of the head (see fig. 49, pi. XIV) the suboesophagal 

 and supercesophagal ganglion are shown, with the maxillary 

 setEe on either side of the subganglion over which the pharynx 

 passes. The superganglion, or upper brain, is extremely large 

 in proportion to the head, and lies forward toward the front 

 surface of the face or epicranium. Branching out on either 

 side of this ganglion is a large optic nerve which leads to the 

 ■compound eye. (See o, fig. 49, pi. XIV.) 



