IOWA ACADEMY OF SCIENCES. 63 



Rybaxis truncaticornis Brendel. Not uncommon in the same 

 situations as D. abnorme. March to June. 



Bryaxis arguta Cas. Common with the preceding. Pound 

 in April, May and June. 



Beichenbachia divergens Lee. March to June, common, with 

 other species. My experience has been that the species of 

 Beichenbachia differ little in habits. They frequent open grassy 

 spots and may be found under stones and pieces of wood. 



B. facilis Cas. April and June. 



B. subsimilis Cas. May 22d. Determination uncertain. 



B. congener Brendel. March to June. 



B. cribricollis Brendel. April and May. 



B. rubicunda Aube. April 15th. 



B. bicolor Brendel. No date. 



B: puncticollis Lee. May 15th-82d. 



B. sodalis Cas. March, April and May. 



B. peregrinator Cas. May 22d. 

 Anchylarthron cornutum Brendel. No date. 

 Cylindrarctus longipalpis Lee. No date. 



C. crinifer Cas. May 22cl. Sifted from piles of dead grass. 

 lychus minor Lee. April 15th. 



Pselephus erichsonu Lee. Many specimens have been taken 

 about the end of November, nearly all in one very circum- 

 scribed locality. They hide under small stones which lie upon 

 turf. 



Pilopius lacustris Cas. This species is rather common in 

 exposed places, under pieces of stone or wood, late in the 

 autumn and early in the spring. 



P. consobrinus Lee. No date. 



P. zimmermanni Lee. No date. 



Ceophyllus monilis Lee. April, May, June, in nests of Lasius 

 aphidicola (and Lasius interjectionis?). Not uncommon. 



Tmesiphorus costalis Lee. May 29th. One specimen sifted 

 from dead leaves covering a nest of Lasius americanus. 



T. carinatus Say. April 27th. 



Adranes lecontei Brendel. Found in nests of Lasius aphidicola 

 in May and June; also in the autumn in nests of some yellow 

 Lasius. 



