92 H. C. FALL. 



tion distinctly confused. Pygidium and propygidium sparsely punc- 

 tured, the latter without trace of apical groove. Body beneath 

 sparsely finely punctate. Upper tooth of front tibia a little behind 

 the middle; hind thighs subimpunctate medially; ungual tooth slender, 

 subapical but evidently shorter than the upper part of the claw, more 

 or less obliquely truncate at apex, its tip nearly three times as far from 

 the base as from the apex of the claw. Length 6.25 mm.; width 2.7 

 mm. 



The type of this species was found dead at Vallecitas, in 

 the desert region of southeastern California. It lacks the 

 head, therefore could not be properly described by LeConte. 

 A specimen in my own collection from Hagua Hala on the 

 Colorado River in western Arizona agrees very well with the 

 type, is assumed to be identical, and the description of the 

 head is drawn from the specimen. In the type the hind coxal 

 plates are almost smooth and the abdomen is sparsely punc- 

 tate; in my Arizona specimen the coxal plates are sparsely 

 punctured and the abdomen almost smooth except at the 

 extreme sides. LeConte says that the elytral costae are im- 

 punctate. I did not verify this in my examination of the 

 type, or at least made no note of it. In the Arizona example 

 the costae have each a series of very fine distant punctures. 



BIBLIOGRAPHY AND SYNONYMY. 

 DIPLOTAXIS Kirby. 



1. D. sordida Say (Melolontha), Jour. Acad. Nat. Sci., Phila., v, p. 



197 (1825); Ent. of N. Am. (Ed. Lee), ii, p. 299; Lee, 

 Jour. Acad. Nat. Sci., 2d series, Hi, p. 266 (1856). 

 D. castanea Burm., Lamell., ii, 2d, p. 262 (1855). 



2. D. rugosioides Schf., Jour. N. Y. Ent. Soc, xv, p. 61 (1907). 



3. D. mimosa n. sp. 



4. D. popino Csy., Contrib. to Descrip. and Syst. Col. of N. Am. 



Pt. ii, p. 179 (1885); Biologia Cent. Am. Coleop., vol. ii, 

 pt. ii, p. 164 (1888). 



5. D. cribrulosa Lee, loc. cit., p. 270. 



6. D. arizonica Schf., loc. cit., p. 63. 



7. D. bowditchi n. sp. 



8. D. villosa n. sp. 



9. D. puberula Lec, Smith, Miscel. Coll., vi, p. 80 (1863). 

 10. D. brevisetosa Linell, Proc. U. S. Nat. Mus., xix, p. 400. 



