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the surface smooth and shiniiiQ-. with at most a very indefinite 

 sculpture. Antennae slender and longer than in A', mimiis, the 

 fourth joint longer than the second, and ahout three times as long 

 as its greatest width, the third one and two-thirds the length 

 of the fourth. Pronotum with well-marked transverse constric- 

 tion, shining, very minutely punctate, or sculptured, and with 

 sparse short hairs ; niesonotal constriction longish, the sides 

 forming an almost regular outline with those of the propodeum, 

 the latter narrow, in no wise strongly or abruptly raised in front 

 of the spiracles, closely and minutely punctured or shagreened 

 on the disc, posteriorly transversely rugulose, sparsely pilose. 

 Front trochanters dilating from close to the base, the first and 

 fourth tarsal joints subequal, the fifth with long row of lamellate 

 denticles beneath, chelar claw moderately curved, of the usual 

 structure of Jassid parasites, there being no anteapical tooth. 

 Abdomen smooth, shining, sparsely, but distinctly, pilose. Lengtli 

 3 mm. 



HAB. Xogales, Arizona ; on weeds in September. 



Gonatopus Ljung. 



The single species descrilocd difi:'ers from those I have exam- 

 ined from Europe and Australia in the simple, undivided prono- 

 tum. 



Gonatopns Jiaplothorax sp. nov. 



Testaceous or ferruginous, the abdominal petiole black, the 

 abdominal segments with some pale yellow or whitish bands or 

 maculae, rarely absent. Antennae with 3-5 basal joints pale, the 

 apical ones being black. Legs not variegate. 



Head rather strongly transverse, somewhat concave, l)eing 

 more deeply impressed in the middle, nearly smooth and shining 

 in front of the ocelli, but posteriorly dull and minutely and 

 densely punctured. Antennae longish, fourth joint much longer 

 than the second, about four times as long as its apical width. 

 Pronotumt simply convex, not transversely divided, finely punc- 

 tured and subpubescent in front, posteriorly smoother and shin- 

 ing. Propodeum long, ovate, narrowing gradually into the 

 mesonotal constriction, in profile rising gently from this and not 

 at all abrupt, densely minutely sculptured and with (piite evident, 

 but short, white pul^escence. Fnint trochanters stout, thickened 

 from the base : lamellate denticles in a long even row on the 



