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PROCEEDINGS OF THE NATIONAL MUSEUM 



Figure 11. — Arinolus citrinus, new species, male paratype from Santa Catalina Mountains, 

 Arizona: a, anterior gonopods, cephalic aspect; b, same, caudal aspect; c, left posterior 

 gonopod, cephalic aspect; d, sympleurite of 8th segment, showing median process, with 

 tips of gonopods of right side indicated. 



Diagnosis: A small arinolid characterized by the somewhat rudi- 

 mentary calyx of the posterior gonopod, which is not set off by a 

 constriction as in the other species treated here. 



Description (from holotype): Body small and parallel-sided 

 except for the enlarged sixth and seventh and reduced third and fourth 

 segments. Length undeterminable; maximum diameter about 2.8 mm. 



Color uniform medium to dark brown, legs and antennae light 

 brown. 



Front of head smooth and convex, with several fine transverse 

 striations; occipital groove very faint. Clypeal foveolae 4-3. Labral 

 teeth much larger and better defined than in A. torynophor. Mandible 

 without a true antennae groove, the outer surface merely depressed 

 and smooth, the lower edge with a well defined marginal ridge. 



