I'liF i..\Mi;i.i.i(()i;\ r.i;i:i"i.i'.s. ?)?)!) 



I;ii'i;('(l .111(1 pfojcctiii'^' t'orwjird so ;is to almost close llic oral cavity, 

 its sides liaiii^iiiii' down like two curtains, whence the liciieric name. 

 They usually occui- Iteiieath st(in(>s and chunks in or about ants' 

 IM sts. The LiTcat ma.iorit\' of the 111 species listed have tlie iiieiitum 

 entir(> and pointed hehind. and occur Ironi Kansas and .Nebraska 

 westward. Seven, most of which have the mentum de(^i)ly concave 

 and notch(>(l Ix hind, occur east ol' tile Mississippi. Of these four 

 have lieeii taken in Indiana, uhile aiiothci" ])ro1taltly occurs. 



KKY TO IMUA.NA SI'KCIKS OK ( UK.M ASTO( U I l.t S. 



(I. Menlnni i>Inte acutely aiisulate and entire hehind ; le^'s not fossorinl. 



tarsi as \nnix as tlie tii>ia': liind angles of thorax triangular, smooth. 



contintKMis willi the side luiu'gin ; frnnl angles ceiitinuiius witii the 



disk, innicliired. ISC.l. KNocani. 



iKi. .Menluni plate distinctly netclied or witli a deep eniarginat ion liehind. 



/;. Xetrh on hind iiiirder of nieiduni pl.afe sni.all. .•icnte; front angles 



prominent and distinct fnim tlie disl< : hind angles md contiiuKHis 



with the disk. vakioi.osis. 



hh. .\etcli of menlnm plate wide and deep. 



c. IMsk of tlK.rax coarsely and densely iiunctnreiL 

 (I. Front angles of thora.x coidinuous with the disk; hind angles 

 coidinnnns with the outer margin of the disk. 



18()2. CANALIClLATrS. 



(hi. Frmd .angles separated from the disk by a transverse impres- 

 sion; hind angles completely separated by a groove and de- 

 pressed below the surface of the disk. 1803. castane.t:. 

 re. Disk of thorax shining, sparsely and irregularly punctured; front 

 angles short, obtuse, hind angles retracted and slightly depresse<l. 



18()4. IIAI?R1SII. 



isci (.lOiM). Cremastoc'HII.us kxocuii Lee., Proc. Phil. Acad. Nat. Sci.. 



isr.:?. 2:n. 



Elongate-oblong. Pd.ack. fet^ily shining. Meidnm pl.Ue Hat ;it bottom, 

 angtdate and eiUire behind. Thorax one-half wider than l(mg, base not 

 wider than ajiex, sides broadly curved; front angles feebly prominent, nnt 

 linnted hehind by a line; hind angles triangular, smooth, limited on inner 

 side by .an obli(ine imiiressinn ; disk nuKlerately convex, coarsely but not 

 densely punctured; m(>dian line evident l)ut faint. I'tyira with ov;d. shal- 

 low, often more or less coullueid. innictures. Length Id-l;! mm. 



Lake, Laporte. INIarshall and Kosciusko counties; rather I're- 

 (|uent beneath rubbish alono- the beach of Lak(> ^lichi^'an ; only one 

 each from the oth(>r two counties, these also beneath chunks on 

 borders of lakes, one of them with a colony of small brown ants. 

 .\pril 25-Au«;ust 20. 



('. variolostt-^ Kirby, lenofh !) mm., occurs in the "Middle States 

 region," and has been recorded from Cincinnati. 



