266 MEMOIRS ON THE COLEOPTERA 



Acupalpus Dej. 



As represented by trivialis, the species here referred to the genus 

 Acupalpus, which is very much more developed in the palsearctic 

 than in the nearctic fauna, have the body very small in size, not 

 much elongated and rather convex, with the elytra frequently 

 wider behind the middle than at base and with the scutellar stria 

 short or altogether wanting, except the persistent basal fovea. 

 They form a group quite distinct from European species of the 

 meridianus and fiavicollis type, in the small size of the body, shorter 

 antennae, less rounded basal angles of the prothorax and in their 

 uniformly dark colored elytra. In trivialis the emargination of 

 the mentum is evenly parabolic in form, rather deep and the 

 palpi are short, the second joint of the labial slightly compressed 

 and shorter than the third, which is rapidly and acutely pointed 

 at apex. The ligula is very slender, parallel and shorter than the 

 paraglossse, the latter narrow, rounded at tip and feebly concave. 

 The inner lobe of the maxilla is slender and moderately arcuate 

 distally and the last joint of the outer lobe is somewhat as in 

 Anthracus in its very slender, gently arcuate form, but is not 

 quite so long. The mandibles are thick, oblique, nearly straight 

 externally and hooked slightly at tip. The anterior angles of the 

 epistoma are sharp and abruptly projecting. The oblique frontal 

 foveae are finely prolonged to the eyes. The hind tarsi are slender, 

 of very moderate length and the first and fifth joints are subequal, 

 scarcely so long as the second and third combined. The anterior 

 tarsi of the male are only very feebly dilated and have beneath two 

 approximate series of very thin elongate subdecumbent hyaline 

 squamae, the middle tarsi slender and unmodified. The abdomen 

 is finely, sparsely punctate medially, with four terminal setae in the 

 female and perfectly smooth, with two terminal setae in the male. 

 The five species in my collection may be known as follows: 



Head very large, only slightly narrower than the prothorax in either sex. 2 



Head smaller, much narrower than the prothorax 3 



2 Body very short and stout, subcuneiform, rather inflated posteriorly, 

 shining, piceo-testaceous, the prothorax generally clearer; legs, an- 

 tennae and palpi testaceous; head smooth, the neck unusually long 

 and fully as long as the eyes, which are much smaller and more 

 feebly convex than usual; antennae rather stout, as long as the elytra; 

 prothorax fully two-fifths wider than long, the sides strongly rounded 



