ART. 23 REVISION OF THE BEETLE GENUS OEDIONYCHIS BLAKE 17 



of semioval form. Abdomen shining, sparsely, obsoletely, coarsely 

 punctate. Legs entirely reddish yellow. 



Length. — 0.25 inch (6.5 mm.). 



Type locality. — Southern Arizona. 



Distribution. — Southern Arizona . 



This species was not examined by me and the description is copied 

 from Horn. 



E. T. Cresson, who has kindly compared specimens for me, finds 

 that it differs from the Mexican species Oe. 10-guttata by having the 

 second row of pale spots on the elytra transverse and not oblique. 



8. OEDIONYCHIS AEMULA Horn 

 Fig. 13 

 Oedionychis aemula Hoen, Trans. Amer. Ent. Soc, vol. 16, 1889, p. 185. 



Oblong-oval, faintly shining, pale yellow with black-spotted or 

 banded pronotum, each elytron with three black vittae, a common 

 sutural, a median, and a submarginal, the submarginal being only 

 on posterior half. Antennae not half the length of body, rather stout, 

 piceous, third joint slightly longer than fourth. Head shining black, 

 with yellow spot between eyes, coarsely punctate about eyes and pale 

 spot, median groove short and indistinct, interocular space half as 

 wide as head. Pronotum over twice as wide as long, narrowed 

 slightly anteriorly, with narrow margin having nearly straight sides, 

 very faintly punctate; five more or less distinct black spots, some- 

 times united to form fascia. Scutellum rounded, black, shining. 

 Elytra oblong-oval, with very narrow margin and slightly rounded 

 humeral prominences, and faint trace of sulcus ; faintly punctate ; a 

 rather narrow sutural vitta extending to apex, a median vitta a 

 little broader on each elytron, not reaching apex, and a very narrow 

 marginal vitta beginning at middle and extending nearly to apex, 

 these vittae having a bluish or purplish luster. Body beneath finely 

 pubescent, reddish brown or piceous except for yellow prosternum 

 and yellow tip and margin to abdomen, in this resembling vians; 

 legs dark brown or piceous, outer edge of hind legs darker; epi- 

 pleura piceous. 



Length. — 5 mm.; width 3 mjn. 



Type locality. — Arizona. 



Distnhution. — Arizona. 



In the British Museum is a type specimen of Oe. dugesi Jacoby 

 from Mexico which closely resembles Oe. aemula except for elytral 

 markings. The elytra are entirely green (blue or green, according 

 to Jacoby 's description) with pale yellow margin. It is possible that 

 Oe. dugesi is a dark nonvittate form of aemula. Similar variation 

 has long been known in Oe. inter jectionis. 



27617—27 3 



