300 ROBERT E. SNODGKASS. 



eral parts, the " paraglossse " ("morphologically a third pair of 

 maxillae"). Then he farther states that the paraglossse are the 

 organs that Burgess called the "lingual glands." The ducts from 

 the latter are described as chitinous bands, which unite in the lower 

 wall of the oesophagus. He must have simply looked through the 

 head of cleared specimens and supposed that the lingual glands 

 were free lobes lying above the labium, whereas they really lie 

 within the head cavity. 



In the present paper anatomical preparations are described and 

 figured that show definitely that in both the Mallophaga and the 

 Corrodentia the palpi, when present, belong to the maxilla?, and 

 that the maxillary forks are independent structures having no rela- 

 tion to the maxillae, except that of proximity and muscular attach- 

 ment. 



II. The Mouth-parts of the Corrodentia. 



The mandibles (figs. 13 and 14) are of the ordinary, strong, 

 heavy, luting type. They are usually two toothed and have a large 

 lobe projecting mesad from the inner basal angle. In all species 

 examined they lie in a horizontal plane, parallel with the head, as 

 in the suborder Amblycera of the Mallophaga. 



The maxillce (figs. 10 and 12) consist each of a body piece (mx.), 

 probably representing the stipes or stipes and cards, of a 4 jointed 

 palpus (pi.), with sometimes a palpifer (plf., fig. 10 ), and of one 

 weakly chitinized terminal lobe (/.). This lobe is regarded by 

 Enderlein (13, 14) as the outer lobe or galea of the maxilla — the 

 furca maxillaris being regarded as the inner lobe or lacinia. 



Figure 12 shows sufficiently the shape of the maxilla of Troctes 

 divinatorius, and figure 10 that of Peripsocus califoruicus. In the 

 former the stipes (mx.) is a long club shaped plate lying at the side 

 of the labium, much as does the stipes of the Mallophagan maxilla. 

 In Peripsocus californicus the stipes (mx.) is a small ovate plate. 

 The palpus is 4-jointed in each species ; in T divinatorius it is born 

 directly by the stipes; in P. California/* it is supported on a palpi- 

 fer (fig. 10, plf. ). The terminal lobe (I.) is in each case simple and 

 weakly chitinized. 



The labium (figs. 9 and 11) consist of a large submentum and of 

 a men turn bearing a pair of usually 1-segmented palpi and one pair 

 of terminal lobes. According to Enderlein (13, 14) the palpi are 

 sometimes 2 jointed. Enderlein describes also an " endolabium " 



