new Species of Biploptera. 49 



Head as broad as tliorax ; mandibles 5-tootlied (including? 

 tlie larfje apical tootii and the basal tooth, which is very small 

 and indistinct), furnished with long hairs on the outer side ; 

 clvpeus truncate at apex, as broad as long, narrowly produced 

 towards apex; haiis on labial palpi orange-ochraceous ; 

 pronotum truncate anteriorly, widening towards the tegulae ; 

 disc of mcsonotum with four caiinae terminating at its pos- 

 terior margin ; scutellum, postscultllum, and median segment 

 rounded, unarmed. 



First abdominal segment narrower than second, with a 

 shallow longitudinal sulcus at apex. Head and tliorax 

 covered with deep, reticulate punctures ; abdomen subniti- 

 dulous, with a few minute punctures; head, thorax, and 

 abdominal segment 1 basally covered witii an irregular griseous 

 pubescence, thickest on the vertex and truncation of median 

 segment. 



Length 10 mm. 



^ . Difleis only in the usual sexual characters ; the yellow 

 clypeus is shallowly emarginate at apex. 



Tibet : Gyangtse, 13,000 feet. Collected by H. J. Walton 

 on the Tibet Expedition, 1903-4. 



10 ? ? , 2 c? c? . _ 



This striking form differs from the other species of Ptero- 

 chihis from Western and Central Asia in the form of the 

 clypeus, which is truncate at the apex. P. aherrans, P. afro- 

 hirtus, and P. fuscoliirtus all have the lateral angles acute 

 (according to the descriptions) at the apex of the clypeus, 

 while P. eckloni undi P. dalla-torrei have the clypeus apically 

 emarginate. In P. crahroniformis the median segment is 

 laterally armed with tubercles. 



PterocMlus tibefanus, sp. d, 



Jsiger; duobus maculis postocularihus, pronoto antice, postscutello, 

 segmentis dorsalibu.s 1-5 fasciis apicalibus, pallida tlavis. Palpis 

 labialibus ferrugineis. Segmento mediano inermi. Alis senii- 

 hyalinis, costa infuscata. 



Long. 10| mm. 



? . Black ; a small spot behind the eyes, the anterior 

 margin of pronotum, postscutellum, narrow apical fasciae on 

 tergites 1-5, and sternite 2 on the side at apex lacteous while. 



Labial palpi and hairs ferruginous. Wings subhyaline, 

 the costal area infu-cate. 



Head as broad as thorax, mandibles with the teeth blunt; 

 clypeus apically truncate, as broad as long, narrowly pro- 

 duced towards apex ; postscutellum and median segment 



Ann. t& Ma^. ^\ Hist. Ser. 8. Vol. xi. 4 



