338 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 99 



Elytra strongly convex, transversely depressed along base at middle, 

 at base siibequal in width to pronotum at base; sides broadly con- 

 stricted at basal fourths, then gradually converging to the tips, which 

 are conjointly narrowly rounded; lateral margins coarsely serrate 

 along apical fourths. Surface striately punctate, the punctures in 

 the striae separated from one another by about their own widths; 

 interstrial spaces on sutural regions flat, about as wide as the strial 

 punctures, wider and slightlj^ convex toward sides, sparsely, coarsely, 

 regularly punctate, with a rather long, fine, semierect, white hair 

 arising from each puncture. 



Abdomen beneath densely, finely, deeply punctate, densely clothed 

 with long, fine, erect and recumbent, white hairs; intervals smooth; 

 last visible sternite broadly rounded at apex, without a subapical 

 carina. Prosternum coarsely, rather densely, deeply punctate at mid- 

 dle, coarsely ocellate-punctate at sides, densely clothed with long, fine, 

 semierect, white hairs ; anterior margin truncate. 



Length 12 mm., width 3.25 mm. 



Type locality. — Tehuantepec, Oaxaca, Mexico. 



ry^e.— U.S.N.M. No. 58790. 



Described from a single specimen collected July 2, by Frederick 

 Knab. 



This species belongs to Horn's Truncatae group. It is allied to 

 Acmaeodera wheeleri Van Dyke, but it differs from that species in 

 being much larger, and in having the head and pronotum black, the 

 head slightly depressed at the middle, the pronotum transversely 

 flattened along the anterior margin, with a longitudinal groove at 

 the middle, the elytra with 12 yellow spots instead of 14, and the 

 elytra and underside of the body clothed with rather long, fine, semi- 

 erect, white hairs. 



ACMAEODERA RUSTICA, new species 



Rather broadly elongate, robust, slightly flattened above, broadly 

 rounded in front, strongly narrowed behind middle, moderately shin- 

 ing above, more strongly shining beneath, black, with a faint aeneous 

 tinge on underside of body, and each elytron ornamented with yellow 

 markings as follows : A small, elongate spot behind humerus, a small, 

 irregular, transverse spot along lateral margin at middle, three small 

 spots arranged longitudinally on disk (a small spot at basal fifth, an 

 irregular spot at middle, and a small one at apical third) , and a small 

 spot near sutural margin in apical region. 



Head flat in front, broadly, shallowly depressed on vertex, slightly, 

 transversely flattened behind clypeus, coarsely, shallowly, confluently 

 ocellate-punctate, sparsely clothed with long, rather broad, erect, white 

 hairs; clypeus broadly, shallowly, triangularly emarginate in front. 

 Antenna extending to basal third of pronotum ; segment 1 elongate, 



