PTILIUM. 375 



nearly triangular, as broad as thorax, eyes not prominent ; 

 thorax short, Itroadest before middle, with indistinct traces 

 of a central furrow in front, not reaching middle, and with 

 a deep impressed line on each side, reaching from base 

 beyond middle ; elytra elongate oval, broadest before 

 middle, closely and rather deeply asperate, apices narrow, 

 rounded. L. ^ — ^^ 1. Very rare. P. Halidayi, Mat. 

 U. Thorax with central furrow. 



a, Tliorax with a distinct impressed line on each side. 



/. Lateral impressed lines on thorax divergent 

 forward. 



1, Head nearly as broad as thorax ; elytra half as 

 long again as head and thorax. 



Convex. Chestnut-brown, rather alutaceous than tuber- 

 culate, with short, yellow hairs ; antennae and legs yellow, 

 last joint of former oljtuse. Thorax constricted at base, 

 lateral impressed lines indistinct ; elytra oval, rather broad, 

 apices obtuse, very slightly rounded. L. -^ 1. Not un- 

 common. P. my rmecoi^hilum, Allib. 



2, Head much narrower than thorax ; elytra more 

 than half as long again as head and thorax. 



Elongate, convex, rather closely and very feebly tuber- 

 culate. Brown, with short, gray hairs ; antennae and legs 

 yellow, last joint of former elongate. Narrower than P. 

 myrmecophilwm, with elytra not dilated behind and club of 

 antennae less thickened. L. -^ — jS_ l. Not uncommon. 



P. exaratum, Allib. 



II, Lateral impressed lines on thorax parallel. 



1, Lateral impressed lines on thorax deep. 



Oblong-ovate, strongly convex. Black-brown, feebly but 

 distinctly tuberculate, scantily covered with short, silvery 

 hairs ; antennae pitchy ; legs yellow. Head small, eyes 

 small, not prominent ; thorax broadest behind middle, 

 constricted at base ; elytra ovate, distinctly tuberculate, 

 w^ith larger tubercles here and there, apices rounded, with 

 sutural angle nearly a right angle. L. yV 1. Rare. 



P. affinc, Er. 



2, Lateral impressed lines on thorax feeble. 



Elongate, rather feebly, closely tuberculate. Brown-red, 

 with short pale hairs ; antennae and legs pale yellow ; 

 uudor-side red-yellow. Head large, eyes rather large and 



