REVISION OF SUBGENUS PHYTALUS — SAYLOR 167 



PHYLLOPHAGA (PHYTALUS) SONORA. new name 



Plate 9, FiGtnsE 6d ; Plate 10, Figures 6o-6c 



Phytalus debilis Horn, Trans Amer. Ent. Soc, vol. 12, p. 122, 1885 (not 

 LeConte, 1856). 



Male. — Highly polished, glabrous, rufotestaceous, varying at 

 times almost to piceoiis. Head with front coarsely and moderately 

 densely punctured, the punctures shallow, more or less umbilicate, 

 usually separated by one to two times their diameters, a large im- 

 punctate area on vertex; clypeal suture impressed, strongly biarcu- 

 ate ; clypeus wide, relatively flat, apex narrowly emarginate, slightly 

 reflexed, disk coarsely and sparsely punctured. Antennal club longer 

 than funicle. Thorax with sides entire, obtusely rounded at middle, 

 slightly sinuate behind, front and hind angles obtuse, the latter 

 prominent; disk regularly punctured, the punctures separated by 

 one to three times their diameters. Elytra sparsely and shallowly 

 punctured. Pygidium flattened, sides slightly concave, very sparsely 

 punctured, glabrous except for a few erect hairs on margin near the 

 subtruncate apex. Abdomen slightly flattened and very sparsely 

 punctured at middle; posterior half of segment 5 at center with a 

 raised granulate lobe, the latter not quite reaching the apical margin 

 of the segment, segment 6 narrowly and transversely impressed, with 

 a row of cilia along apical margin. Posterior spurs free. 



Female. — More robust, clypeal suture more deeply impressed, faintly 

 biarcuate; pygidium just before apex with a smooth slightly raised 

 area, the apex of which has a single row of rather large punctures, 

 each with a long erect hair; spurs long, apices rounded; abdomen 

 convex, with segment 5 finely punctured in apical half, segment 6 

 somewhat transversely impressed at base, sparsely punctured, apex 

 ciliate; the 10-segmented unicolorous, dark antennae with the club 

 elongate, equal to segment 3-7 combined; hind femora quite broad; 

 otherwise similar to male. 



Length, 10-14 mm. Width, 5.5-6 mm. 



Remarks. — Most of the material is from Arizona: Tucson, Carr 

 Canyon, Globe, Patagonia, and Badger, taken in June, July, and 

 August. I have a dozen examples in my collection from Mexico, all 

 collected in Rio Mayo, Sonora, by Howard Gentry, at Sierra 

 Charuca (July), San Bernardo (July), and Vinaterio (June). The 

 species has not been recorded from Mexico before. 



A not uncommon species of which the female has apparently not 

 previously been recognized. In my collection is one individual of 

 that sex from San Bernardo, Mexico (Gentry), from which the 

 diagnosis has been drawn. The male pygidium may vary from 

 almost flat to rather strongly convex. In some few examples, the 

 sides of the thorax are very finely crenulate- 



U. S. SOVERNMCNT PRINTINS OFFICE: ISS9 



