78 



like at the tips. Remove a mandible and make a drawing 

 of it. 



Remove both mandibles and labrum, and grasp the re- 

 maining protruding parts with forceps and carefully pull 

 them loose from the head. Wash while still held in the for- 

 ceps, and mount in glycerine on a glass slide. Before reading 

 farther the student should endeavor to name the various 

 parts presented before him on the slide. 



Make a drawing of the maxillae and labium, and name the 

 parts, tentatively. Compare the result with the notes fol- 

 lowing : — 



Maxillae. — The parts of each maxilla present are the car- 

 do, stipes, galea (or lacina ; one of the two is probably want- 

 ing), maxillary palpi, and possibly the palpifer. 



Cardo. — The cardo, or proximal part of the maxilla, is a 

 rather long, slender, strongly chitinized sclerite, somewhat 

 resembling a human femur or thigh-bone in shape. At its 

 proximal end it terminates in two unequal prongs, the point 

 of the larger being bluntly rounded. At its distal end 

 (articulating with the stipes) it expands club-like. 



Stipes. — The stipes is an irregular, elongate sclerite, strongly 

 chitinized. Its proximal end is bluntly rounded and swollen. 

 The stipes articulates with the proximal segment of the galea 

 (see below) by a long diagonal face. 



Galea. — The galea (we incline to believe this part homolo- 

 gous with the galea of the locust's maxilla, rather than with 

 the lacinia, because of its two-segmented condition) extends 

 distad from the stipes as a tapering blade-shaped piece. It 

 is composed of two segments. The proximal' one is small 

 and triangular, articulating by the entire length of one of its 

 margins with the stipes. The distal segment or sclerite con- 

 stitutes the real blade-like portion of the maxilla, and nearly 

 equals in length the ligula and labial palpi (see below). Its 

 surface is unequally divided into two portions by a subme- 



