HEAD, MOUTH-PARTS, ORTHOPTERA EUPLEXOPTERA 269 



pheromera, Stenopelmatus, Melanoplus, and Tettix, and dis- 

 tinct on the dorsal aspect in Gryllus, Melanoplus, and Tettix. 

 Crampton ('16) has named a small secondary lobe on the lateral 

 margin of the distagalea of Diapheromera, the 'galealobulus.' 



The maxillary palpus contains five segments. The proximal 

 segment is small and cylindrical, with the distal portion fre- 

 quently thickened; the second is larger than the first, except in 

 Diapheromera, Tettix, and Anisolabis; the third is long and 

 cylindrical — in Mantis the longest segment of the five ; the third 

 and fourth are usually subequal in length; and the fifth is clav- 

 ate, subequal to the fourth in length in Gryllus, Orchelimum, 

 Stenopelmatus, Melanoplus, Tettix, and Anisolabis. The distal 

 segment in Mantis is small, cone-shaped, and subequal in length 

 to the second; the largest and flattened in Diapheromera; and 

 the tip provided with a small distinct papilla in Anisolabis. The 

 two distal segments in Tettix are somewhat flattened. Except- 

 ing Mantis and Diapheromera, the distal end of the fifth seg- 

 ment of the palpus is covered with numerous setae. 



The maxillae articulate with the head at the precoilae, dor- 

 sad of which the entoparartes always extend. On the dorsal 

 aspect the margins of the cardo and stipes are continuous with 

 the maxacoria and on the ventral with the labacoria. 



The labium (lb) in Blatta (figs. 120 and 128) consists of the 

 submentum (sm), mentum (m), and ligula (li) which includes 

 the stipulae (sp), glossae (go), paraglossae (pgo), palpigers (pp), 

 and labial palpi (Ip). The submentum is a large subquadrate 

 basal sclerite. Its caudal margin is transversely emarginate and 

 is continuous with the microcoria (ma). The cephalic margin 

 has a deep round emargination into which the semicircular 

 mentum fits. The lateral margins of the submentum are folded 

 over on to the dorsal aspect and form the lateral lobes (11), the 

 margins of which are continuous with the labicoria. The men- 

 tum is much smaller and narrower than the submentum, and 

 the distal portion is only slightly chitinized. The suture be- 

 tween submentum and mentum is sometimes obsolete at the 

 middle. The distal margin of the mentum is membranous and 

 is folded dorsad and then caudad so that the ligula is placed at a 



