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a pale yellow or whitish Ijand between the middle and the apex, 

 which is black or dark, the apices of the tibiae also dark. 



Head distinctl}-, but not strongly, concave above, dull, with 

 excessively minute close sculpture. Antennae moderately long 

 all the joints being elongate, the penultimate being at least one 

 and a half times as long as its greatest width, the third joint one 

 and two-thirds the length of the fourth. The pronotuni is 

 smooth and shining, but is punctate, the transverse division very 

 distinct, the mesonotal constriction moderately elongate. There 

 are a few short hairs on the thorax above, and the usual long 

 ones just behind the mesothoracic constriction beneath. The 

 propodeum is dull, with very fine sculpture on the disc near the 

 spiracles, the whole posterior surface regularly transversely 

 rugose, the wrinkles finer in some examples than in others, and 

 in front of the spiracles and laterally the surface is also rugo.-e. 

 Legs formed as in C. frcqnens and others, at most with v^ry 

 short and inconspicuous hairs; first and fifth tarsal joints of 

 front legs subequal, or with the latter slightly the longer, 

 the lamellate denticles in a long row, the trochanters with short 

 basal stalk. Abdomen shining, smooth, with hardly perceptible 

 sculpture. Length 4-5 mm. 



HAB. Xogales, Arizona ; a series of specimens taken on weeds 

 in August and September. 



11. CJialcogonuiupits xcsioccphahis sp. nov. 



Extremely like C. Jicrbannn. the chelae being similarly formed, 

 the lan-^ellate denticles reaching to, or almost to, the basal articu- 

 lating cavity of the fifth joint beneath. The legs have a 

 similar pattern, the thin apical part of the femora being con- 

 spicuously paler (whitish yellow) than the basal part, and with 

 dark tips ; the posterior tibiae also darkened at the apex. Tro- 

 chanters of front legs dilating from close to the base, there Dting 

 no long thin stalk. 



Head, thorax, legs (except as noted above) and the haso of 

 the abdomen l^ehind the petiole brown, in some parts darker in 

 some more yellowish ; mandibles except teeth, and the scape be- 

 neath pale yellow. Four basal antennal joints ferruginous or 

 testaceous, the fourth more or less darkened, the following also 

 obscurely pale, the apical joints black. Abdomen except near 

 the base black. Head slightly concave, with the sculpture of the 

 surface so feeble that it is shining, and bears also some sparse and 

 excessively feeble punctures. Proiiotum smooth and ])olished 



