-TWO A'Sir MYRMECOl’II ILOUS HIETKRIDAE 
()9 
1907] FALL- 
concave l.ea.l, narrow femora, and in the form and length hf the Oattencd area of the 
prostermim. 
Melanetaerius new genus. 
d'liis name is proposed for a very singular insect wluc’h po.s.sesscs the general 
structure and form of I letaeririus, hut ditfers remarkahly in its blackish color and 
den.selv punctured integuments. The obli,,ue impresse.l pronotal grooves .so char- 
acteristic of lletaerius are here wanting, and the elytra are completely devoid ot diseal 
striae 'I'he pro.sternum is Im.adlv flat at summit, the marginal hues diverging troin 
between (he coxae to the sharply impre.ssed transver.se line which .lehmits the broad 
anterior lobe. Front and middle thighs rather .slender and subcylmdriea , their 
tibiae narrower than in lletaerius, with an angiilate lamimform dilatation ju.st beyond 
the middle. Hind thighs rather thick at base, narrowed from base to apex; hind 
tibiae strongly dilated and flattened, the surface convex on the outer side and concave 
within The dilatation of hind tibia begins somewhat abruptly at about the ba.sa 
fifth, graihially widening to apical fourth, where it terminates in an acute ang e, 
then suddenlv narrows to apex. Tarsi short, received in shallow excavations of t le 
hmer face of Hie tibial expansions in the front tibiae; in the hind tibiae this groove 
is deeper and occupies the outer e.lge from the angle to the apex; in the middle tibia 
the structure is intermediate in character. In other respects much like lletaerius. 
M. INFERN.VLIS 11. Sp. 
I'iceous, legs dark rufous or rufopiceous; upper surface densely punctate and 
rather dull, subglabrous. Head densely punctate, front loneave. Frothorax two- 
fifths wider than long, sides nearly straight and slightly convergent from base to apex 
front angles narrowlv impres.sed and a little reflexed, side margin thickene.l and 
elevated, the thickened margin narrowed and interrupted at the imddle; just ^Mthln 
ami opposite the point of interruption a rounded polishe.l .set dermis tubercle; di.s v 
broadly feeblv convex and .lensely rather .-oarsely inmetate; inner side of the thick- 
ened margin polished and impunetate. El.Mra one-third wi.ler than the thorax and 
nearlv three-fourths as long as wi.le; wide.st at the humeri, sides thence slight y 
convercrent and .straight to apical third, aj.ex truncate; surface densely rather coar.sely 
punctate, with intermixed finer punctures; these latter sometimes bet^^Ten, .some- 
times within the rather shallow coarser punctures; disk without trace of .striae, t ic 
marginal stria traceable toward the base; surface nearly glabrous, a few short sti 
erect setae near the sides and apex. Propygidium densely punctate and with t^^o 
