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SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 52 



nection of the maxillae with the mentum. The subgaleal area is also 

 connected with the mentum along its interno-lateral margin. The 

 stipites (St) are distally not subdivided into a palpifer, and are fused 

 internolaterally with the subgalea. 



A single bristle (b) occurs near the externo-lateral margin. It was 

 called the setole laterale dello stipite by Russo. In the present paper 

 the name is modified into seta stipitis maxillaris. The palpiferal area 



Labi d 

 i Ma 



Fig. 38. — Gnathotrichus uialcriarius Fitch : A, labium and maxilla, ventral as- 

 pect : B, clypeus and labrum, ventral aspect. 



Ca, carilo; Fr, front; £/>/(, epipharynx; Ga, galea; La, lacinia; Lab, labium; Lar, labrum; 

 Lpp, labial palpi; Li, ligula; M, mentum; Ma, maxilla; Oes, oesophagus; Pp, maxillar palpi; 

 Ppf, maxillar palpifer; SM, submentum; St, stipes; C, clypeus; a, seta palpifera maxillaris; 

 b, seta stipitae maxillaris; c, seta ligulae distalis; d . seta submento-lateralis; e, papilla labro- 

 apicalis; /. papilla epipharno-distale; r/, papilla clypei ; h, seta menti; i, seta ligulae mediana; 

 ;, seta labio-palpiferis, and palpiferal area; k, seta ligulae basalis. and basal area; /, seta 

 lacinio-maxillaris; m, epistomal apodeme; u, apodeme between lateral angle of epistoma and 

 dorsal angle of pleurostoma. 



bears two bristles (a) and one puncture; the outer corresponds to 

 the setola laterale dello palpifera, and the inner to setola mediana 

 dello palpifera (Russo), here called seta palpiferae (maxillaris). The 

 palpus is two-segmented, telescopic, the first segment armed with a 

 short fine hair and two punctures, the second with punctures only. The 

 bristle on the first segment is the setola palpiale (Russo) but to dis- 

 tinguish it from possible setae on other joints, it should be called 

 seta palpo-maxillaris i-. The lacinia is present as a well develo^^ed 

 lobe distally armed with two long bristles (setae lacinio-maxillaris) 



