NORTH AMERICAN COLEOPTERA. 155 



Abdomen entirely covered by the elytra. 



Mesosternum short, carinated, carina very short. 



Metastkrnt'M rather short, not extending to the sides of the body. 



Venter 7 segments. 



Le(5S moderate. 



Posterior co.x.-e almost contingent, rather narrowly laminated. 



IV. Americaiilim Motschnlsky Bull. Mose. 41, pi. 2, p. 191.— L. c. 1 mm.— 



Oblong, oval, very convex and shininnj, sparingly clothed with rather long yellow 

 hairs; head and thorax pitchy black; eh'tra bright rufous; liead large; eyes 

 prominent; thorax rather short, moderately dilated at the base, very shining, 

 faintly and remotely punctured; sides rounded and margined, margins yellow, 

 posterior angles nearly right angles ; elytra rather long, oval, more than half as 

 li>ng again, but not wider than the head and thorax, rather deeply punctured in 

 transverfe sinuate I rows, apex broad, much rounded; antennae rather short; legs 

 and antennte bright yellow. 



United States (Motschulsky). 



N. postliuinum Matthews Cist. Ent. xi, p. 29S, 1S7I.— L. c. .7f> mm.— Oval, 

 very convex, shining, testaceous, clothed with short yellow pubescence; head and 

 thorax very shining, remotely punctured ; thorax widest at the base, with the 

 sides moderately rounded and widely margined, basal angles rather acute; elytra 

 widest at the shoulders, rather longer, but not wider than the head and thorax, 

 deeply asperate in transverse sinuated rows, apex obtuse ; legs and antenme yellow. 

 Differs from ^V. Americannm in its minute size and narrow form, and 

 also in sculpture. 



United States (Crotch), one specimen. 



List of North American Trichopterygidae. 



HYDROSCAPHINA. Pterycodes Matth. 



Hydroscapha Lee. Salvinii Matth.* 

 natans Lee. Pteryx Matth. 



TRICHOPTERYGINA. ^" ^^"^ ^^''"''• 



balteata Lee. 



Ptinella Motsch. brunnea Loc. 

 Championana Matth.* Ptinellodes Matth. 



pellucida Matth.* LeContei Matth. 

 Pini Lee. 



Quercus Lee. Limulodes Matth. 



incerta Matth.* paradoxus Mattli. 



Championella Matth. Myrmiootriohis Motsch. 



nubigena Matth.* aeqaatorialis Motsch.* 



