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stalk, first and fourth tarsal joints subequal ; fifth with two long 

 rows of lamellate denticles beneath, of which, as in various other 

 species, one row extends further back than the other, its denticles 

 nearly reaching; the articular cavity, towards which they 

 are set more widely apart from one another ; the other row 

 shorter. Chelar claw very strongly curved. Legs thinly pilose, 

 the hairs on the posterior tibiae as long as these are thick. Abdo- 

 men shining and smoother along the apical margins of the inter- 

 mediate segments, which elsewhere are densely minutely sculp- 

 tured, and bear also somie feeble largish punctures, from whicii 

 the sparse hairs spring. Length 6 mm. 



Hab. Nogales, Arizona ; in August on oak. 



15. Chalco(^oiiafol>iis pcrdcbilis sp. nov. 



Testaceous, the abdominal petiole black, the antennae yellow 

 or testaceous, but towards the apex they become more or less 

 smoky, even strongly so in some specimens. Hind and middle 

 femora distinctly variegate, paler on the thin apical part than on 

 the basal, and the extreme tips darkened. 



Head not very strongly transverse, deeply concave, and with the 

 surface smooth and shining, the space between the eyes anteriorly 

 much shorter than the length of the head along the median 

 dorsal line. Antennae with the fourth joint longer than the 

 second, and three or more times longer than its greatest width. 

 Pronotum behind the transverse groove closely punctate or 

 sculptured, and not shining, the mesonotal constriction dull, 

 elongate : the propodeum more or less shining on the disc, pos- 

 teriorly rugose, and with some short hairs. Front legs with the 

 first and fourth joints of the tarsi not differing much in length, 

 the fifth beneath with a short row of lamellate denticles occupying 

 about half the length of the underside of the joint between the 

 articular cavity and the terminal curved portion or hook, the den- 

 ticle nearest the articular cavity much the longest, chelar claw 

 slender, moderatelv curved. .Abdomen shining and smooth. 

 Length 2.5-3.2 mm. 



This description is mainly drawn up from the type specimen. 

 Of the several examples seen none seemi quite identical m sculp- 

 ture, form, etc., and it is possible that there is more than one 

 species before me. One of these appears to have longer antennae 

 and legs, the front trochanters with longer and thinner stalk 

 and two minute projecting angles just behind the mesonotal 

 constriction. The propodeum may be little, or not at all. shining. 



