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5- ChaJcogoimtopus argyrias sp. nov. 



Yellowish-brown or ferruginous, the abdomen and four apical 

 joints of the antennae black. Slender apical part of all the 

 femora pallid yellow ; base of middle and hind tibiae widely 

 blackish, the apices of the latter widely brownish, darker than the 

 middle part. 



Head long- and concave on the vertex, its length in dorsal 

 aspect along the middle line about equal to that of a line drawn 

 from eye-margin to eye-margin through the front ocellus, and 

 as long as one and a half times the distance between the eyes at 

 the extreme front of the vertex ; in front of the anterior ocellus 

 the surface is manifestly smoother than posteriorly, and is less 

 dull. Third joint of antennae equal to one and two-thirds of the 

 fourth, the latter four times the length of its apical width. 

 Pronotum with distinct transverse furrow, the surface for the 

 most part not much shining, being finely and feebly punctured ; 

 mesonotal constriction narrow and elongate, the propodeum dis- 

 tinctly pilose, finely punctured and more or less shining on the 

 disc, posteriorly (and at the sides miore or less) transversely 

 rugose. Legs with only short hairs, the front ones long and 

 slender, but the thin stalk of the trochanters is less elongate than 

 in the four preceding species, though it is distinct ; first and 

 fourth tarsal joints subequal, fifth beneath with a row of close-set 

 regular denticles beginning at only about the middle of the 

 length of the whole joint from its articulating cavity, between 

 the latter and the series of denticles only some setae and one or 

 two isolated denticles not belonging to that series are present. 

 The abdomen is dull with dense surface sculpture and bears also 

 large feebly impressed punctures. It is conspicuously clothed 

 with appressed silvery hairs. Length about 3.5 mm. 



HAB. Nogales, Arizona ; on weeds in September. 



6. Clialcogoiiatopiis rapax sp. nov. 



Head, prothorax and mesothorax ferruginous, the abdomen 

 and propodeum black, the latter reddish on the disc in front ; 

 scape of antennae in front, and the mandibles except the teeth, 

 which are reddish, yellow, side-pieces of the pronotum with 

 black border above, the anterior margin of the pronotum black 

 in the middle. Front legs ferruginous, the femora and tibiae 

 being more or less obscured in parts, the basal tarsal joint darker 

 than these, the following joints clearer and more yellow. Middle 

 and hind tibiae blackish, the femora dark above, but vellowisii 



