THE CANADIAN ENTOMOLOGIST. 135 



NOTES ON THE SPECIES OF OODII OF LOUISIANA. 



BY S. V. SUMMERS, M. D., NEW ORLEANS, LA. 



The species belonging to this sub-tribe, although small in number, 

 rank with the rarer forms of Carabidce ; they may easily he known by their 

 glabrous body and the confluent eighth and ninth stri?e of the elytra. 

 Several of the Oodii bear a superficial resemblance to certain Aniara 

 allied to fallax. With one exception ( O. elegans) the species are all 

 Atlantic, occurring more abundantly southward. Oodcs fluvialis must be 

 considered a typical northern species, occurring rarely near St. Louis, 

 Mo., but more abundant at Rock Island, 111. O. elegans has occurred 

 with Dr. Le Conte along the Gila River, in Arizona. We may expect 

 additional species from the Southern Pacific region and the western source 

 of the Rio Grande. 



Lachnocrepis parallelus (Say). 



A single ^ specimen taken in November, under a partially submerged 

 log on the Jackson R. R., near New Orleans. Dr. Horn gives the length 

 0.42 inch (Trans. Am. Ent. Soc, v. 3, p. to6) ; my specimen measures 

 0.44 inch long. Color black, somewhat shiny ; basal angles of thorax 

 reddish brown. I have not been able to find this species in any of the 

 New Orleans collections. I have seen one in ]\Ir. Trabrandt's cabinet, 

 from Mexico, near the Rio Grande. 



Anatrichis niinuta (Dej.) . - 



Our smallest Oodii ; length, 0.20-0.25 inch. Rather rare. Specimens 

 taken adhering to under surface of logs near streams, and on sifting mud 

 from roots of plants over water. This species seems not to have occurred 

 in Louisiana collections before last winter. 



Oodes amaroidcs (Dej.) 



Length, 0.34-0.40 inch. More than twenty specimens taken in galleries 

 under logs, in very damp or muddy places. The species of the sub-genus 

 Oodes (Chaudoir), have the abiUty to remain under water for nearly an hour 

 at a time, and are seldom found running on the ground. 



Oodes Americanus (Dej.) 



Length, 0.58 inch. A single ^ taken under a rail on the Ponchartrain 

 R. R. Several others occur with Mr. Trabrandt. Our largest and rarest 



