36 miLLETIN 15, I'MTKI) NTATKM NATIONAL Ml'SKl'M. 



In statiiif; this ^»miiis to 1m' syinniyuKtu.s witli MvHit'nix Spinola and 

 HeleroroUa DalillMnn, Vvoi'. Westwood «'n(Ml anil iuMed not a littUi t4) 

 the confusion icsucctinj,' it, as ull tliesr };tMi( la an' <iuito distinct, Ife- 

 hrovwlUt is, as Dalilboni indicated, a jicnus in tlic family <'hry.sidi«la', 

 wliile j}hxitiun is a p-nus allied to Kpyrin. For an cxplanatiou of tliia 

 statement sec my remarks under the j;enus MeHitlun. 



The j?enu.: is found associated with various ants; it maybe jiarasitic 

 iipou the ants, or up<»n tlu^ myrmecophilous ('oleoptera so frequently 

 found in their n«'sts. 



Our siKicics may he re<'Of;nized by the aid of the following table: 



TABLE OF Sl'El.'IES. 



MALES. 



MesOi.iMum without fiirrowH 3 



Mesonotum with furrows. 



TransviTso iiitMlian nervuro iutiTstitial 2 



TrauHvt'rae median lurviire »'ve<tod. 



Antenna' and legs pale ierru^jinons L maoncm sp. nov. 



2. Wings snhhyaline. 



Abdomen iiiccons, paler at siitnies, rufe.>*eent beneath. 

 Antenn* and legs ])ale ferriiginons or brownish yellow. 



Mandibles with small teeth within I. MYKMECo riiii.UM, sp. nov. 



Mandibles very large and ))road without teeth within. 



I. MANDIHULARE, Ashm. 



Wings hyaline. 



Abdomen rufous, sometimes more or less piceous toward base above. 

 Antenna- and legs pale ferruginous. 



Abdomen not longer than the thorax I. rckivkxtrk, sp. nov. 



Abdomen brownish-yellow. 



Abdomen elongate, much longer than head and thorax together. 



I. MONTAXIM 8]). nov. 



3. Wings subhyaline. 



Blaek; legs pale ferruginous, the femora obfuseated above. 



I. FLOKIDANUM Ashm. 



femai.es. 



Head black, with large pnnctnres. 



Thorax dark brown, or mahogany. 



Abdomen not longer than the thorax, rufo-pieeons 1. myrmecopHilum 



Thorax rufous. 

 Abdomen brownish-yellow, nnich longer than the head and thor >;: nnited. 



I. montanum 

 Hea«l piceous. i. 



Thorax rufopiceous. 

 AlKlomen brownish-yellow, hmger than the liestd and thorax together. 



I. mandiiu:lare 



Isobrachium magnum sp. nov. 



$ . — Length nearly 5""", Bla<'k, punctate; head a little longer than 

 wide, rather strongly ])unctate, the surfiu-e alutaceous. Antenna? 13- 

 jointed, brownish-yellow , tlie liagellar joints from 2 to 2 J times as long 



