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lower edge of the fifth joint of tarsi, and reaching to, or almost 

 to, the articulating cavity, chelar claw moderately curved. Ab- 

 domen smooth, not or hardly sculptured, in fresh specimens with 

 sparse pale hairs. Length about 3 mm. 



One example has no evident pale markings on the abdomen, 

 but probably this is chiefly due to post mortemi changes of color. 

 The above species will, I suspect, be subsequently and properly 

 separated from Gonatopus, as a distinct genus, but as in some 

 of the allied genera intermediate conditions between a simple and 

 a transversely divided pronotum are found, for the present it 

 may be associated with the Jassid parasites, that have a five- 

 jointed maxillary and two-jointed labial palpus. Length 3.5 mm. 



H AB. Nogales, Arizona ; collected from weeds in August and 

 September. 



Pseudogoiiatopiis Perk. 



1 (2) General color black 1 P. aufo.vciiobiiis. 



2 (i) Testaceous, the abdominal petiole black. .P. ariconicus. 



I. Psciidogoiuifopiis ari::onicus sp. nov. 



Testaceous or ferruginous, abdomen sometimes brownish, the 

 petiole black, the apical seven joints of the antennae darkly in- 

 fuscate or blackish, mandibular teeth dark. 



Head distinctly concave above, narrow between the eyes an- 

 teriorly, the distance between their margins anteriorly being 

 mluch less than the length of the head dorsally along the middle 

 line, the surface nearly smooth and more or less shining, but 

 duller and more sculptured behind the line of the ocelli ; antennae 

 quite distinctly clavate, the fourth joint rather longer than the 

 second and more than three times as long as its greatest width, 

 the third being about one and two-thirds the length of the fourth. 

 Pronotum distinctly transversely divided, on the posterior part 

 closely and finely punctured, mesonotal constriction longish, be- 

 hind which the thorax is strongly widened ; propodeum strongly 

 convex, rising quite abruptly from the mesonotum, as seen in • 

 profile, very densely and finely sculptured, dull or almost so, 

 transversely rugulose posteriorly, without pilosity ; front tro- 

 chanters long and rather slender, first tarsal joint somewhat 

 longer than the fourth, the fifth with the usual two rows of 

 lamellate denticles, convergent towards the tip, the one row longer 

 than the other, chelar claw with onlv about four denticles, and 



