1 92 MEMOIRS ON THE COLEOPTERA. 



Tribe PINOPHILINI. 



This tribe is greatly developed and diversified in North and South 

 America and is represented in this country by the three following 

 genera : 



Abdomen strongly margined at the sides, simply punctate; mandibles long, 

 slender, strongly bent basally; body large to moderate in size, the habits 

 epigaeal; male sexual modifications at the abdominal apex not asym- 

 metric 2 



Abdomen not margined at the sides, cylindric and coarsely, regularly im- 

 bricate in sculpture; mandibles very small, evenly arcuate, bifid at apex, 

 the points very slender and aciculate, the inner the shorter; body much 

 smaller in size and very much more fragile, the habits arboreal; male 

 abdominal characters remarkably asymmetric 3 



2 Mandibles edentate or with a small simple internal tooth near the base; 

 integuments polished and more or less coarsely and remotely punctate. 



Araeocerus 



Mandibles each with a parallel slender tooth internally at but little behind 

 the middle, the tooth oblique and emarginate or subbifid at apex; 

 punctuation much closer as a rule, the integuments generally less 

 shining Pinophilus 



3 Body paler in color as a rule, with the antennae much shorter though 

 slender, the abdomen relatively very slender Palaminus 



The differences between the first two of these genera and Pala- 

 minus are subtribal in nature, although the relationship is shown 

 sufficiently by certain general characters, such as the large and 

 asymmetric last palpal joint, form of the head, dilated anterior 

 tarsi of both sexes and some others. Some systematists have as- 

 signed the Pinophilini to the Paederini as a subtribe, but the dif- 

 ferences are too radical I think to permit of such association. 



Araeocerus Nordm. 



Two species of our fauna are assigned to this genus on the author- 

 ity of Dr. Sharp, who, in the "Biologia," states that Pinophilus 

 picipes is an Ar&ocerus, a genus different from Pinophilus though 

 united therewith in the Munich catalogue. Though the mandibles 

 are not strictly edentate, the tooth is very small, simple and near 

 the base, thus differing quite markedly from Pinophilus; the species 

 are as follows: 



Form stouter and more convex, deep polished black throughout the body, 

 the antennae piceous, the legs rather pale piceo-rufous; head and pro- 

 notum strongly, very remotely punctate, the latter somewhat longer 



