LeConte.J APIOmD^. 409 



antice attenuatus, nitidus glaber, niger; elytris subsenescentibus, antennis 

 pedibusque ferrugineo-testaceis ; capite obtuso, oculis planiusculis ; thorace 

 antice capitis latitudine, subconico, postice latiore. basi simpliciter trun- 

 cate ; elytris antice thoracis latitudine, postice ovato-dilatatis. Long. | lin. ; 

 lat. elytr. ^ lin. 



EUXENUS n. g. 



I can give no other characters for distinguishing this genus, except the 

 punctured surface and less ovate form of body. 



1. E. punctatus n. sp. 



Oval, very convex, slightly narrower in front ; brownish-black, glabrous 

 shining ; sides of elytra piceous, base of antennae and legs testaceous. 

 Head feebly punctulate. Prothorax a little wider at base than long, gradu- 

 ally narrowed from the base forwards ; tip broadly rounded, base nearly 

 rectilinear ; disc deeply but not coarsely punctured. Elytra scarcely wider 

 than the base of the prothorax, and punctured similarly, except that the 

 punctures are arranged in irregular double rows, with narrow intervening 

 smooth spaces. Beneath brownish, punctured ; ventral segments short, 

 equal. Length 1.2 mm. ; .05 inch. 



Detroit, Michigan ; one specimen ; Messrs. Hubbard and Schwarz. Dr. 

 Horn has received another from Canada. The head is so much deflexed 

 that I cannot examine the form of the mentum without risk of breaking 

 the insect. 



Family XL APIONID^. 



Mentum narrow, linear, much longer than wide, inserted upon a short 

 gular peduncle of equal width ; slightly channeled at tip, reaching nearly 

 to the mandibles, and quite concealing the ligula and palpi, which are very 

 small, maxillae entirely tilling the buccal fissures with a large corneous 

 mass ; palpi not visible ; on dissection they appear very short, with not 

 more than three joints ; there is but one broad lobe, densely fringed with 

 hairs. Mandibles three-toothed, the middle tooth curved, acute, forming 

 the apex ; near the tip on the anterior edge is a small tooth ; the thiid tooth 

 is on the inner side and very large. 



AntennjE inserted at the sides of the beak, in foveoe, eleven-jointed, 

 straight, first joint longer than second ; these two are stouter than the suc- 

 ceeding ones ; 9-11 broader and longer, forming an oval pubescent club, 

 which is pointed at the end. 



Head prominent, not deflexed, not narrowed behind the eyes, which are 

 rounded, convex, and not finely granulated ; beak long and slender, some- 

 times stouter towards the base ; without antenna! grooves. 



Prothorax truncate, in front, without postocular lobes, subsinuate behind, 

 gradually narrowed from base to tip ; prosternum very short, coxal cavities 

 rounded, confiuent, closed behind ; prosternal sutures distinct. 



Mesosternum small, narrow between the coxse ; side i)ieces diagonally di- 

 •vided ; epimera triangular, pointed at the inner side, and not attaining the 



PROC. AMER. PHILOS. SOC. XV. 96. 2Z 



