624 TRANSACTIONS OF THE 



pressed and punctured, the interstitial spaces with rather large 

 punctures : feet rufous. 



Length less than three-tenths of an inch. 



For this species I am indebted to Dr. Harris. [186] 



EUCNEMIS Ahrens? Mannerheim. 



■j" Pectus not inflected at the edge, nor canaliculate beneath, to 



receive the antennse. 



* Tarsi simple. 



1. E. MUSCiDus S. [Mater muscidus Ann. Lye. N. Y., i. p, 

 256.) The largest known species of the United States. 



2. E. UNICOLOR S. [Elater unicolor Ann. Lye. N. Y. i. p. 

 255.) Also a large species. 



3. E. HETEROCERUS. — Light brown, sericeous ; three last 

 joints of the antennae largest. 



Inhabits Indiana. 



Body light reddish brown, sericeous, with bright yellow hair ; 

 punctures minute, universal : antennae, first joint as long as the 

 three next together; second joint smallest; third nearly as long 

 as the two next ; fourth, fifth, sixth, seventh and eighth short, 

 equal; remaining joints each nearly as long as three of the pre- 

 ceding ones together, and somewhat dilated : thorax with an in- 

 dented line at base ; spines prominent, acute : scutel rounded 

 behind : elytra with impunctured stri^e : pectus on the lateral 

 margin slightly concave. 



Length half an inch. 



The singular form of the antennae will distinguish this fine 

 species from any other yet known. It will form a separate 

 genus. 



[Belongs to PMegon Lap., a genus which I afterwards described 

 as Euryptyclius. — Leg.] 



4. E. QUADRicoLLis. — Head and thorax with large crowded 

 punctures ; posterior thoracic angles nearly rectangular. 



Inhabits Indiana. 



Body piceous black, with yellowish hairs : head with crowded, 

 large punctures, longitudinally confluent on the vertex : antennae 

 rather distant at base, not seated in approximated sinuses, but 



[Vol. VI. 



