70 EXTOMOLOGISK TIDSKRIFT 1 894. 



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3rd joint consists very plainly of two in the median line coales- 

 ced halves, each of which is continuated as an articulated, free, 

 obliquely triangular lobe (1"'), being but a little longer and broader 

 than its joint, set with rather long setaï along a portion of the 

 outer margin, while its distal part is soft skinned and ornated as 

 the tip of the maxilla. The palpus is about half as long as the 

 maxillary palpus, 3 jointed, the joints increasing in length from 

 the base, and the last one with the terminal face showing the 

 same structure (Pl^ 2, fig. 14) as the above described last joint 

 of the maxillary palpus. 



Submentum is posteriorly articulated with a rather large, 

 transverse plate (PI. 2, fig. 4, o) lying between it and the proster- 

 num (p), and this plate I consider to be the well developed ster- 

 num of the segment, which bears the labium and of which the 

 tergite is not developed, while chitinous plates, probably repre- 

 senting the epimera, are present behind at the posterior lateral 

 angles of the sternum. From below we see on each side a smaller, 

 transverse plate, divided by a transverse line into two halves (fig. 

 4, q), and from the anterior margin arises a plate (not seen in 

 the figure), broad behind and forward narrowed, stretching forward 

 at the side of »the neck» and anteriorly connected with the skeleton 

 of the head. Such a strong develoinnent of a sternum for the 

 labium is, as far as I know, otherwise only found in the Forfi- 

 ailina, while in several other OrtJioptera, f. inst. the Ålantodea, 

 we find the lateral plates very highly developed. The inner sur- 

 face of the submentum and of the greatest part of the mentum 

 is as usual coalesced with the inferior side of the head, the median 

 sternal part of which as in other Orthoptcra and in Tkysanura 

 prolongs itself forward in the mouth-cavity as a free process, 

 which is called the hypopharynx. 



The hypopharynx is (PI. 2, fig. 9, h) oblong triangular, 

 anteriorly somewhat rounded, the inferior side is well chitinised 

 and glabrous with the exception of the soft-skinned anterior tip, 

 the upper side (fig. 10, h) is soft-skinned and clothed with excee- 

 dingly fine hairs as the apical part of the outer maxillary lobe. 

 When the labium is removed from the head it is seen that it has 

 been coalesced with the inferior side of the head not quite to the 

 beginning of the hypopharynx, and at the hind corner of the hypo- 



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