KM'. (iEO. II. HORN, M. D. 



of the clypeus and the tip of the prostemum. JJoth species are finely 

 pubescent. 



Occurs in California and Nevada. 



HI. Wlieola. Mels. — Oblong, moderately elongate, not depressed, seneous, be- 

 aeath more shining, surface sparsely pubescent. Front broad, clypeus broadly 

 emarginate, surface densely punctured, occiput somewhat strigose. Thorax nar- 

 rowed in front, sides feebly arcuate, margin obliterated in front, hind angles obtuse 

 slightly flattened above, disc densely punctured becoming slightly reticulate at 

 the sides, beneath very densely, not very coarsely punctured, presternum broadly 

 triangular at tip. Elytra moderately convex, densely granulate punctate, margin 

 at apex finely serrulate, tips separately rounded. Body beneath sparsely and 

 rather feebly punctate. Posterior tarsi as in f/entilis. Length .18— .2(3 inch; 

 4.5 — fi.5 mm. 



The last ventral segment is slightly truncate in the male, oval in 

 the female. 



As already intimated this species and intrusa are closely related and 

 have but little resemblance to the other species of this genus. 



Occurs in the Middle and Southern States. 



M. obtusa n. sp. — Subcylindrieal, moderately robust, metallic greenisli-blue, 

 elytra darker. Front broad, coarsely but not deeply punctured, clypeus feebly 

 emarginate at middle. Thorax convex, narrowed in front, sides moderately 

 arcuate, margin obliterated in front, surface coarsely, deeply and rather densely 

 punctured, slightly reticulate at the sides, beneath coarsely, deeply and densely 

 punctured, presternum broadly triangular at tip. Elytra very coarsely punctured 

 at base becoming granulate posteriorly, the posterior margin finely serrulate, the 

 tips separately rounded. Body beneath coarsely but not densely punctured. 

 Posterior tarsi as in gentilis. Length .22 inch : 5.5 mm. 



The last ventral segment is slightly truncate and the margin reflexed. 



T have seen but one specimen of this species which resembles in its 

 form one of the smaller species of Acmaeodera. It is more obtuse at 

 either end and more cylindrical than any species in our fauna. 



( )ne specimen, Georgia. 



ANTIIAXIA Esch. 



In the study of our species I have been unable to find any sexual 

 characters like those which have been observed in the species of Europe. 

 On the other hand, with an incomplete series however, I have not been 

 able to find any of the latter with the tarsal claws toothed as in our 

 cyanella and quercata. 



It will be observed that these two species differ from each other in 

 the same manner that virldifrons and viridicornis do, and the question 

 has arisen in my mind whether they are not respectively sexes of each 

 other, the male in each case having the rougher surface sculpture. 



With an original tendency to a contrary course I have been compelled, 



