344 KANSAS UNIVERSITY SCIENCE BULLETIN. 



figure 23, AB, shows its attachment and plate XLI, figure 27, 

 its place of attachment after the labrum has been removed. 

 In making this dissection for plate XLI, figure 28, I was 

 unable to tear the hypopharynx away from the labrum with- 

 out destroying the composite arrangement of the other parts. 

 To keep the parts intact I turned the hypopharynx under and 

 backward. The end of it shows in the upper part of the figure. 

 The muscular attachments of the labrum are shown in dotted 

 outline in plate XL, figure 14, composite view. Since the ap- 

 pendage which I have called the labrum does unite with the 

 hypopharynx to form the opening of the pharynx, and since 

 Krjepelin states that "the so-called epipharynx has no exist- 

 ence,"" and that the labrum has a lower wall which was once 

 deemed a distinct piece, the epipharynx, I am persuaded that 

 this appendage is the labrum. Those two chitinized points 

 that Smith has called mandibles are closely connected to the 

 end of the labrum, but not muscularly attached. (PI. XL, 

 fig. 16.) Their origin is conjectural. 



The parts of the labrum A and B, plate XL, figure 24, are 

 attached at their bases to the base of the hypopharynx at A' 

 and B', plate XL, figure 24. That part of the labrum C, plate 

 XL, figure 24, seems to be of a muscular nature, or tendonous. 

 It is firmly attached to the clypeus, so firmly, in fact, that I 

 have been unable to tear it loose without tearing to pieces the 

 clypeus. (See plate XL, figure 14.) Furthermore, it seems to 

 be free and unattached except at its ends. 



Maxillie of the "First Maxillse." 

 According to Packard, the first maxillse are inserted in the 

 sides of the head just behind the mandibles and mouth. The 

 three basal pieces supporting the maxillse, the cardo, stipes, 

 and palpifer, in the order given, may be distinguished as 

 shown in plate XL, figure 17, cs, PF. "The three distal di- 

 visions of the maxillse are called, respectively, beginning with 

 the innermost, the lacina, galea, and palpifer, the latter being 

 a lobe or segment bearing the palpus."" 



From our dissections these parts are found to be present in 

 the order given, and bearing a like description of typical seg- 

 ments of the same, except the galea, which is wanting. The 

 lacina is attached inside the palpifer to the stipes. The palpi- 

 fer bears a palpus and is also connected to the stipes. (PI. XL, 

 fig. 17, PE, PA.) 



9. Packard, A. S., A Text Book of Ent., pp. 62, 63. 



