538 PROCEEDINGS OF THE NATIONAL MUSEUM vol. los 



and shallower toward the anterior angles where the sculpture becomes 

 more or less rugose, quite coarse toward the posterior angles, smoother 

 and more finely punctate over the lateral fovea, and rapidly much 

 finer and sparser basally at middle, Scutellum smooth with scattered 

 indistinct, very fine punctures. Elytra elongate, sides subparaJlel, 

 punctures mixed, very fine throughout, moderate in the oblique 

 geminate striae and intervals, and with a very fine, vague, close, 

 minute sculpture, not alutaceous, in addition, all punctures fine 

 laterally and apically. Pygidiiun finely scabriculate in lateral angles 

 and toward the middle basally, otherwise smooth and very finely and 

 sparsely punctate throughout; more convex than in female. Underside 

 sparsely hairy anteriorly, prosternal process behind anterior coxae 

 with apex nude and convex anteriorly, with long hau's limited to sides 

 and posterior part. Anterior tibia carinate and roughly, coarsely 

 punctate outside the longitudinal row of coarse setigerous punctures, 

 claws normal. Acdeagus distinct (see fig. 56). 



Allotype female: Length 29 mm., mdth 14 mm. Differs from the 

 male in the shape of the pygidium, which is much less convex, with 

 close, mixed fine and moderate punctures throughout, these super- 

 imposed on fine scabriculate sculpture along the base and in the lateral 

 angles. 



Type locality: Los Mochis, Siualoa, Mexico, collected July 22, 

 1955, at light by R. B. and J. M. Selander. 



Paratypes: 38 males, 53 females, same data as holotype and allo- 

 type; 1 male, Los Mochis, Sinaloa, Mexico, July 25, 1922, C. T. Dodds; 

 3 males same locality and collector, July 20, 1922; 3 males, 1 female, 

 Hermosillo, Sonora, Mexico, July 9-16, 1953, Borys Malkin; 1 male, 

 Mazatldn, Sinaloa, Mexico, July 21, 1955, R. B. and J. M. Selander; 

 1 male, Esperanza, Sonora, Mexico, July 15, 1955, F. Pacheco-M., 

 1 female. Phoenix, Ariz., Aug. 10-20, 1908 (L. W. Saylor collection). 

 See map (fig. 3). 



Paratypes will be placed in the British Museum (Natural History), 

 Riksmuseum, Canadian Department of Agriculture, American 

 Museum of Natm-al History, California Academy of Sciences, Chicago 

 Museum of Natural History, Frey Museum, Musemn of Comparative 

 Zoology, and in the private collections of L. J. Bottimer, W. W. Gibson, 

 Henry Howden, Antonio Martinez, P. Francisco Silvario Pereira, 

 Mark Robinson, and R. B. Selander. 



Remarks: The typical series shows little variation. However, 

 the shallow depressions on each side of the median, anterior, pronotal 

 depression are more noticeable in some specimens; in some the coarse 

 punctures of the wide interval between the sutiu-al and first geminate 

 striae become vague, shallow and almost obliterated by the other 

 surface sculptiu-e, in others the punctm-es remain distinct but shal- 



