370 



PSyXHE. 



[April 1896. 



e'. Riither slender liodied ; outer edge of upper valves of ovipositor with 

 a single or no denticulation at the base of the scoop ; hind tibiae normally 

 glaucous but sometimes red ...... minor. 



e'-. Rather stout bodied; outer edge of upper valves of ovipositor crenu- 

 lato-denticulate on the basal half of the scoop ; hind tibiae coral red. 



col/iiins. 

 b". Lower valves of ovipositor straight, with feeblest signs of a median tooth ; 

 interspace between mesosternal lobes strongly transverse ; prosternal spine 

 short, not nearly reaching the level of the mesosternum . p2i?ictiilat?{i. 



Two of our species, M. extremus M. extremiis, and seem to be confined 



and M. fasciatiis, are distinctly and almost or quite exclusively to very high 



strikingly dimorphic, occasionally oc- elevations. The long-winged form of 



curring with tegraina surpassing the j\I. fasciatus has been seen by me • 



hind femora. These long-winged forms only from Michigan, but should be 



are known in New England only in looked for in northern New England. 



ON COLEOPTERA FOUND WITH ANTS. THIRD PAPER. 



BY II. F. WICKIIAM. IOWA CITY, IOWA. 



To the earlier contributions of mine 

 on this subject, published in some of 

 the preceding numbers of Psyche, I 

 wish to add the foUovying observations, 

 made a£ Iowa City during the years 

 lS94and 1S95. A number ofthe records 

 are new. both as regards host and local- 

 ity, while a few are inserted simply as 

 information touching upon dates or as 

 furnishing additional proof regarding 

 the true status of certain species. I 

 have adopted the plan of taking up 

 each species of ant separately and enum- 

 erating its guests ; as in this way it 

 would seem easier for the reader to form 

 an idea of what is likely to be found in 

 a given nest. For identification of all 

 the hosts 1 am under obligations to Mr. 



Theo. Pergande, while most of the 

 Pselaphidae and Staphylinidae were 

 named by Captain Casey, who, as we 

 all know, has for years made careful 

 studies among tliem. Several unde- 

 scribed Aleocharini and some Scyd- 

 maenidae are also in my collections 

 from ants' nests, but these are not in- 

 cluded in the present paper. 



I. Formica siibsericea Say. A 

 strong colony of this species, having its 

 nest in a little rocky mound, was ex- 

 amined on April 14 and the following 

 beetles obtained : Ptomaphagus fara- 

 situs Lee, eight specimens, chiefly at 

 a distance of several inches from the 

 surface. They are lively little fellows 

 and run about actively in their eflbrts 



