272 HACHIRO YUASA 



The palpiger is small and lateral in position in all except 

 Melanoplus, where it is located on the ventral aspect. The 

 suture between the palpiger and stipula of each side is obsolete 

 or indistinct in Mantis, Diapheromera, Orchelimum, Tettix, and 

 Anisolabis. 



The glossae are small and e'ongate. In Gryllus, OrcheUmum, 

 Stenopelmatus, and Tettix, they are pointed, in the remaining 

 genera more or less rounded. In Melanoplus the dextral glossa 

 is distinctly larger than the sinistral, which is rudimentary. 



The paraglossa are very mugh larger than the glossae, except 

 in Mantis, where they are sHghtly smaller. In Melanoplus 

 they are enormously expanded and decidedly larger than the 

 glossae; are more or less flat in Mantis, Diapheromera, Melano- 

 plus, and Tettix; thicker and folded mesad in Gryllus, Orcheli- 

 mum, and Stenopelmatus. In all of the latter genera the mesal, 

 cephalomesal, or dorsal portion of each paraglossa is concave 

 and overlaps the glossa to a greater or less extent. In Gryllus 

 and Stenopelmatus a furrow, some distance caudad of the 

 suture, separates each paraglossa and stipula. This furrow may 

 be an indication of the suture which separates the paraglossa into 

 two segments — a condition comparable to the two-segmented 

 galea of the maxilla. Anisolabis has only a single appendage at- 

 tached to the distal end of each stipula. As to the interpretation 

 of this, the literature is confusing. Fabricius (1776) characterized 

 the labium of Forficula as 'trifidum,' but Olivier (1791) correctly 

 spoke of the two equal lobes of the labium. Later, writers seem 

 to have noticed the bifurcated condition of the labium, but, with 

 the exception of Borman ('00), have not recorded their opinion 

 as to the homology of these lobes. This author states that the 

 glossa and paraglossa have fused and formed the single distal 

 lobe attached to each stipula, but I have been unable to find his 

 'deutliche Trenungshnie,' and there is no indication of the real 

 nature of this appendage. It may represent the glossa, the 

 paraglossa, or the product of the fusion of the two. 



The labial palpi are invariably composed of three segments. 

 The basal segment of each palpus is the smallest of the three 

 except in INlantis, where all are subequal. The middle segment 



