22 



variable in sculpture, dull and with close sculpture very distinct 

 in some, in others with the surface smoother and shining:, pos- 

 teriorly with some excessively fine transverse wrinkles. The sur- 

 face is always pilose, the hairs being- short, sparse and fine, but 

 erect or suberect. Front legs wath the first and fourth tarsal 

 joints not dififering much in length, the chelar claw very strongly 

 curved; row of lamellate denticles of fifth tarsal joint occupying 

 only a short ridge, which begins about the middle of the length 

 of the joint from the articulation of the claw, and is not one-third 

 of the whole length of the joint beneath : outside there is a row 

 of a few shorter and stouter teeth, variable in number, one or 

 two of which are placed nearer to the articulating cavity, while 

 starting from the apex of this cavity there is a sharp raised ridge. 

 As usual, setae are present in addition to the denticles, and there 

 is the usual cluster of the latter on the curved tip. Abdomen 

 smooth and shining. Length 2.5 — 4 mm. 



This species varies considerably in size as the above measure- 

 ments show. The depth of colour also varies. In sculpture it 

 does not vary much, except that the propodeum is distinctly shin- 

 ing in some examples, dull in others, and there are intermediate 

 conditions. The form and armature of the chelae is alike in 

 specimens exhibiting the above variations. 



HAB. Nogales, Arizona ; a fine series was captured on weeds 

 at the end of August and in September. 



8. Chalcogoiiafopiis solitariiis sp. nov. 



Dull, reddish brown, the several apical joints of the antennae 

 black, the three basal joints clear ferruginous, the two or three 

 following more or less obscurely pale ; abdominal petiole black ; 

 basal joint of front tarsi concolorous with the tibiae or almost 

 so ; posterior femora concolorous ( at most a little darker at 

 extreme apex), their apical part not being pale yellow. 



Head very little concave above, the eyes not very strongly 

 convergent towards the front, dull, with excessively dense and 

 fine rough sculpture, which under the microscope appears to be 

 formed of a mixture of rugulositv and the usual dense punctura- 

 tion. Antennae shortish, the third joint equal to one and a half 

 times the length of the fourth, the latter subecpial to the second, 

 and hardly more than twice as long as wide at ajxw : penultimate 

 joint scarcely longer than wide. Pronotum dull and closely 

 punctate in front of the transverse furrow, and aho immediately 

 behind this, where is a somewhat flattened area, the posterior 

 lobe being broader than in most species, and smooth and shining 



