NEW MAl.l.OlMlAliA. I'i'l 



(if tlio aliinentiirv canal arc tliosi- of tlic bead, already 

 describe<l in counection with the (esophageal sclerite. 

 With regard to the salivary glands, then, not consid- 

 ering those glands of tlie head, the two suborders differ 

 as follows: The Amldycera possess simply two pairs of 

 salivary organs — a gland and reservoir on each side of 

 the alimentary canal. These are of variable shape, 

 since they may be simple and relatively small or very 

 large, or they may be compound, consisting of as 

 many as twenty separate, secreting tubules. The Isch- 

 nocera possess a pair of simple, small, only sliglitly 

 variable, salivary organs on eacli side of the alimentary 

 canal. These are evidently the homologs of the sali- 

 vary organs of the other suborders, since their ducts 

 unite with one another in the same manner, and since 

 their general position is the same. In addition, they 

 have a pair of small compound glands each element of 

 which consists of a single cell provided with a sepa- 

 rate ductule. The species of the Amblycera are speci- 

 alized individually, tliose of the Ischnocera as a group. 



The Malpujkian Tuhidex. — In all cases known there 

 are four and onlv four MalnisJiian tubules. Tliev are 

 simple tubes generally variously dilated near their bases. 

 This dilatation nniy form a short oval enlargement 

 of the vessels as in Docoj)horut< lori (plate xi, tig. 8), 

 or it may be long, and even occupy half the length of 

 the tube as in Menoj>on fifan (plate xi. fig. lo). These 

 enlarged parts of the tubes are very variable in size, 

 and according to the specimen may be present and 

 large or entirely absent in the same species. In Col- 

 pocepludiim osborni the l)asal parts of the two tubes on 

 each side are united for a short distance (plate xi, 

 fig 7). The vessels are generally very nuuh convoluted 

 and form a tangled mass of tubes about the lower part 



