PSYCHE. 



January igoo. 



Others but without success. Besides 

 these, and some unidentitied Staphxlin- 

 idae, I found an example of TliiasopJiUa 

 americana Fauvel MS. Later visits 

 showed that the Hetaerius could be 

 found as late as the middle of May, and 

 at this time I got Batrisus fossicaiida 

 (chiefly near edges of the nest) and a 

 few Anthiciis melancholiciis. 



III. Formica nitidlventris Em. [ 

 cannot find that any beetles are recorded 

 from the nest of this ant, and my own 

 oliservations had, until recently, been 

 without positive result. On the fourth 

 of last May, however, I found Cremas- 

 tochilus harrisii. in the midst of a 

 strong colon}', under a piece of hoard, 

 on grassy land. Records of the hosts of 

 Cremastochilus are much to be desired, 

 so few having been published, in spite 

 of the undoubted status of these beetles 

 as true guests. 



IV. Lasius americanus Em. This 

 ant frequently makes its home under 

 leaves in the woods, or under loose bark 

 of fallen trees, or of stinnps. Since 

 such situations are also favorite haunts 

 of many Scydmaenidae, Pselaphidae, 

 and Staphylinidae, it is often diflicult 

 to conjecture the true relationships of 

 the ants to the accompanying lieetles. 

 It luav not be out of place, however, to 

 record the following captures of Cole- 

 optera with these ants: Pycnophus 

 ras'/s. Connophronfallidutii., C. capil- 

 los/ilinn without record of date ; Bat- 

 risus frontalis in nest under liark, 

 April 28, both this and B . globosiis in 

 the same situation a month later ; 

 Tmcsiphorits costalis, Batrisus fron- 



talis, Rybaxis conjuncfa var. trini- 

 caticornis from leaves covering a nest, 

 Mav 29. Eurypronota discrcta oc- 

 cinred on one occasion only. Alyrmo- 

 biota crassicomis is often rather abun- 

 dant in subcortical nests, and is, un- 

 doul)tedl\-. a true guest, as it seems not 

 to be met with elsewhere. 



V. Lasir/s aphidicola Walsh. Often 

 lives in immense colonies, under large 

 stones, on wooded hillsides, and quite 

 frequentlv inhabits rotten logs, in moist 

 forest lands, these logs being perforated 

 in all directions by galleries. A small 

 nest, investigated on May 31, yielded 

 Connophroit pallidu7ii. A much larger 

 one, beneath a flat stone, was infested 

 by CcopJiyllus nioirilis, of which I took 

 seven specimens. These beetles walked 

 about, carrying themselves high with a 

 " tiptoeing " motion, among the im- 

 mense swarm of ants, apparenth with- 

 out sufl'ei ing molestation nor receiving 

 aid from their hosts. On May 8 I had 

 e.xamined a large colony occupying a 

 rotting stump, and took from the gal- 

 leries tliree specimens each of Adranes 

 Icco)itei, Ceophylliis nionilis and Bat- 

 risus globosus, one Hotnocusa expansa 

 and sixteen Tarhys fcrrugiiieus. This 

 Tachys often, if not always, occurs 

 with ants. Mr. Hayward has found it 

 vyith them, Mr. G. Beyer once sent me 

 several, mounted with Lasius, from 

 New Jersey ; and personally I cannot 

 recollect having met with it except in 

 the above mentioned nest. A colony 

 of what 1 took to be Lasius ap/iidicola, 

 but which Dr. Wasmaufi identifies as 

 L. interjectiouis Mayr, at home in an 



