ART. 23 REVISION OF THE BEETLE GENUS OEDIONYCHIS BLAKE 21 



Length. — 5 mm.; width 3 mm. 



Type locality. — Texas. 



Distribution. — Texas. 



This species closely resembles gibhitarsa, but differs in its reddish 

 brown, coarsely punctate head, the yellow margin about elytra, and 

 the coarser, deeper punctation. 



13. OEDIONYCHIS LATERALIS Jacoby 



Fig. 8 



Oedionychis lateralis Jacobi', Biol. Cent. Amer., Coleopt., vol. 6, pt. 1, 1886, p. 

 412. 



Broadly oblong-oval, shining, head yellow, pronotum yellow, 

 usually indistinctly marked with from three to five pale reddish 

 brown spots, elytra dark blue, bluish green or purplish, with yellow 

 margin widening at apex and forming a scalloped pattern, body be- 

 neath also yellow. Antennae not half the length of body, stout, pice- 

 ous, basal joints and terminal joint paler, third joint a little shorter 

 than fourth. Head deep yellow, somewhat cribrately punctate on 

 either side of occiput, occiput nearly smooth, median groove short 

 but distinct, interocular space about half width of head. Pronotum 

 about three times as wide as long, with moderately wide explanate 

 margin, shining, paler yellow than head, very faintly and finely 

 punctate, usually having from tliree to five pale reddish brown spots, 

 these often obscure. Scutellum rounded, piceous. Elytra oblong- 

 oval, with distinct humeral prominences with basal sulcus; finel.y, 

 densely and usually shallowly punctate, sometimes rather coarsely 

 punctate, shining; deep blue with green or violet luster, and with 

 narrow yellow margin widening at apex and forming a scalloped 

 pattern. Body beneath finely pubescent, shining, reddish yellow, 

 epipleura pale yellow with piceous edges. 



Length. — 6 to 7 mm. ; width 3 to 3.5 mm. 



Type locality. — Oaxaca, Mexico. 



Distribution. — Baboquivari Mountains, Ariz. 



This species was described by Jacoby from Oaxaca, Mexico. I 

 have examined specimens collected by the late F. H. Snow in south- 

 western Arizona and preserved in the collection of the University of 

 Kansas. Oe. lateralis closely resembles several other Central Ameri- 

 can species. Oe. extrema Harold has a dark head, a distinct apical 

 spot, and narrow yellow margin. Oe. hogei Jacoby has a yellow head 

 and similar apical markings but no pale elytral margin, and Oe. 

 purulensis is similar to hogei but with a black head. Of the species 

 found north of Mexico, it bears a resemblance to Oe. thoraxiica., but 

 differs in being smoother and shining, having less distinct thoracic 

 spots and an entirely pale margin and apical pattern. 



27617—27 4 



