BEETLES OF THE DISTRICT OF COLUMBIA—ULKE. 



57 



ECOLOGICAL NOTES— ('ontimied. 



Xyleborus tachygraphus, bores in Acer 

 dasycarjnim and other trees, on the shore 

 of the river; dispur, in apple; celnts, 

 in hickory; hiograplms, male of relsus; 

 fiii^cntvs, very common in oak; plani- 

 collix, probably male of fui<c(dw<; rc- 

 /(/.s(V(////s, probably male of pidjexcenx; 

 xylographm, abundant on oak. 



Xyloterus xcaftricoUis, rare; politus, com- 

 mon, bores in Acer dasycarpum. 



Corlhylus punclatissimus, common in the 

 roots of Vacciumm corymbosum. 



Monarthrum fasciatum and mali, very 

 abundant in deciduous trees. 



Platypus Jfavicomis and (piadrideril(it)is, 

 mostly boring in pine. 



ANTHRIBID^. 



Eurymycter faseiatuK, on old branches. 



Tropideren hiuHinildtiiK and rrrhix, on dead 

 twigs. 



Horrniscus, lYjxotropin and l-Jiis/)liynis, all 

 common on old twigs. 



Piezocoryniis diHjiar, rmrshi.^ i\n(\ mi.rhi.--, on 

 old logs and under idosc l)ark: /;/- :lm 

 rather rare. 



Ardhrihiiit <-()rindni<, not rare on dead 

 branches. 



('ndoparix limatus and lugubrls, in fungi 

 growing on old logs; lunalm, exceed- 

 ingly common; lugubris, rare. 



Brachyiarsus allernatus and variegatus very 

 common on meadows; tomentosvs, very 

 common on ambrosia. 



Anthribidus rotundatnii, on swampy mead- 

 ows, common. 



Choragas, not rare on dead twigs. 



Euxemts punckdii>>, on twigs, rare. 



