62 IOWA ACADEMY OF SCIENCES. 



Eumicrus oclireatus Cas. May 5th. This and the next species 

 live under bark, in the nests of Lasius amm^icanus. 

 E. saginatus Cas. No date. 



FAMILY PSELAPHID^. 



Bhexius insculptus Lee. Rare. Only three specimens have 

 been found here, one under a stone, the others under pieces of 

 wood in grassy spots. May lst-15th. 



Rhexklius canaliculatus Lee. Sifted from rotten oak wood. 

 May 8th-9th. 



Euplectus interruptus Lee. May 28th. 



E. conHuens Lee. No date. 



E. elongatus Brendel. This and the next species were sifted 

 from a rotten oak stump. May 8th. 



E. pertenuis Cas. May 8th. 



Thesiastes fossulatus 3rendel. June 11th. 



Melba sulcatula Cas. April 28th, June 12th. Rare. The 

 first mentioned specimen was taken from an oak stump with 

 Lasius americanus. The other was sifted from a pile of dead 

 grass in damp bottom land. 



Batrisus scabriceps Lee. Two specimens thus named by Dr. 

 Brendel are in my cabinet without date. 



B. fossicauda Cas. Common in nests of Formica subsericea a,nd 

 F. exsectoides. April and May. 



B. frontalis Lee. Under bark, with Lasius americanus; also 

 found beneath leaves in woodland without the ants. March, 

 April and May. 



B. globosus Lee. An abundant species, usually frequenting 

 damp grassy spots where it may be trapped by laying out 

 pieces of board and turning them over occasionally. Some- 

 times found with Lasius americanus. March, April and May. 



B. foveicornis Ca>s. One specimen, April 13th, in nest of Lasius, 

 doubtfully L. aphidicola. 



B. furcatus Brendel. No date. 



B. denticollis Cas. April 14th. 



B. striatus Lee. Probably our commonest species of the 

 genus. It has about the same habits as globosus and has been 

 taken from March to June. 



Decarthron abnorme Lee. Rather common under stones and 

 pieces of wood or grassy spots. April, May and June. 



D. exsectum Brendel. No date. 



