24 GEO. H. HORN, M. D. 



A. gibbiila, Lec.^(Pl. I, fig. 38.) Form robust, surface distinctly bronzed, 

 sparsely clothed with short erect hairs, elytra with a discal row of five large 

 yellow spots, a marginal row of three or four and between the two a row of 

 three red spots. Head moderately densely punctured, front slightly impressed, 

 Vertex feebly carinate. Thorax nearly twice as wide as long, apex truncate, 

 base sinuate at middle and near the hind angles arcuate, sides verj' feebly 

 arcuate and gradually wider from apex to base, margin moderate, slightly 

 visible from above; disc convex, a vague median impression at base, on each 

 side an oblique impression terminating in a moderately deep fovea at base; 

 surface unieolored, shining, sparsely punctured at middle, more densely at the 

 sides. Elytra as wide as the thorax, umbone prominent, humeral angles pro- 

 longed beneath the angles of the thorax, sides deeply sinuate opposite the 

 nietasternum, then arcuately narrowing to tip, sides serrate; disc inoderately 

 convex, striate, strise feeble at middle and with coarse punctures moderately 

 closely placed, intervals flat with a single series of tine punctures. Body be- 

 neath bronzed, shining. Proslernum in front strongly lobed, lobe emarginate 

 at middle, alae of prosternum attaining the anterior angles. Abdomen sparsely 

 punctured at middle, much uiore densely at the sides and rather densely clothed 

 with long silken, whitish pubescence ; last segment with distinct double apical 

 margin. Length .46 inch; 11.5 mm. 



Occurs in x\rizoDa. 



ACM.EODER^E GRACILIFORMES. 



These species are slender and about four times as long as wide, the 

 body above arcuate from head to tip. Their aspect is much that of 

 certain Agrilus. The two species vary considerably in their prosternal 

 characters, but agree in their slender tarsi, which are especially on the 

 posterior pair of legs greater than half the length of the tibia in ono 

 species and very nearly as long as the tibia in the other. 



They are distinguished as follows: 

 Prosternum emarginate at miiidle and on each side angulate, alse attaining 



ttie anterior angles. Thorax above unieolored. Abdomen more densely 



punctured at the sides with longer hair coinata. 



Prosternum squarely truncate beneath, alae attaining the angles. Thorax 



above yellow at the sides. Abdomen very sparsely punctured alacris. 



These two species have affinities with two of the preceding groups 

 by the form of the margin of the sternum but being very evidently 

 more closely allied to each other than to any other species I have given 

 the tarsal character preference in forming them in a group by them- 

 selves. They are both from California and lead us to expect other 

 species with similar characters from Mexico. 



A. coinata, Lee. — (PI. I, fig. 39.) Form slender, Agrilus like, arched, pice- 

 ous, sparsely clothed with blackish hair, elytra with few small yellow spots. 

 Head coarsely punctured, front impressed, vertex not carinate. Thorax not 

 twice as wide as long, as wide at apex as base, apex truncate, sides slightly 

 arcuate in front then gradually narrower to base, margin feeble, not visible 



